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Please help <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Southampton_BASIC_System&action=edit">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">introducing citations to additional sources</a>.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Southampton+BASIC+System%22">"Southampton BASIC System"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Southampton+BASIC+System%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Southampton+BASIC+System%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Southampton+BASIC+System%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Southampton+BASIC+System%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Southampton+BASIC+System%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">December 2023</span>)</i></span></div></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/SOB_(disambiguation)" class="mw-redirect mw-disambig" title="SOB (disambiguation)">SOB (disambiguation)</a></div> <p> <b>Southampton BASIC System</b> (<b>SOBS</b>) was a dialect of the <a href="/wiki/BASIC" title="BASIC">BASIC</a> <a href="/wiki/Programming_language" title="Programming language">programming language</a> developed for and used on <a href="/wiki/ICT_1900_series" title="ICT 1900 series">ICT 1900 series</a> computers in the late 1960s and early 1970s; it was implemented as an incremental <a href="/wiki/BASIC_interpreter" title="BASIC interpreter">BASIC interpreter</a> under the <a href="/wiki/MINIMOP" title="MINIMOP">MINIMOP</a> operating system at the <a href="/wiki/University_of_Southampton" title="University of Southampton">University of Southampton</a><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> and also ran under <a href="/wiki/MAXIMOP" class="mw-redirect" title="MAXIMOP">MAXIMOP</a>. </p><p>It was operated from a <a href="/wiki/Teletype_Corporation" title="Teletype Corporation">Teletype</a> terminal, though CRT terminals could also be used. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Language_characteristics">Language characteristics</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=1" title="Edit section: Language characteristics"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In common with many early implementations of BASIC, SOBS needed lines to have <a href="/wiki/Line_number" title="Line number">line numbers</a>, both to allow a user to add new lines to the program in the desired place and also as targets for <code>GOTO</code> and <code>GOSUB</code> statements. A <code>RENUMBER</code> facility was available to allow for sections of the code to be renumbered, by default in increments of 10, to allow more space in the middle of a program. </p><p>Other than line numbers, all numeric values were represented internally as <a href="/wiki/Floating_point" class="mw-redirect" title="Floating point">floating point</a>. </p> <div class="mw-heading mw-heading3"><h3 id="Statements">Statements</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=2" title="Edit section: Statements"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The language had relatively few statements by comparison with modern programming languages: </p> <table class="wikitable"> <tbody><tr> <th>Statement </th> <th>Purpose </th></tr> <tr> <td><code>DATA</code> </td> <td>Stored data for <code>READ</code>ing into variables at runtime </td></tr> <tr> <td><code>DIM <i>var</i>(<i>size</i>)...</code> </td> <td>Dimension an array. One-, two- and three-dimensional arrays were supported. </td></tr> <tr> <td><code>END</code> </td> <td>Halt execution of the program. </td></tr> <tr> <td><code>FOR <i>var</i>=<i>start</i> TO <i>end</i> [STEP <i>incr</i>]</code> </td> <td>Perform a set of statements repeatedly for varying values of <i>var</i> </td></tr> <tr> <td><code>GOSUB <i>line</i></code> </td> <td>Call a subroutine at a given line number; flow would return to the next statement when a <code>RETURN</code> was executed. </td></tr> <tr> <td><code>GOTO <i>line</i></code> </td> <td>Unconditional branch to a given line number. </td></tr> <tr> <td><code>IF <i>expr</i> THEN <i>line</i> [ELSE <i>line</i>]</code> </td> <td>Conditionally branch. The <code>THEN</code> and <code>ELSE</code> parts could only give line numbers to go to. </td></tr> <tr> <td><code>INPUT <i>var</i></code> </td> <td>Prompt the user for input data </td></tr> <tr> <td><code>LET <i>var</i>=<i>expr</i></code> </td> <td>Assign a value to a variable. Unlike many modern dialects of BASIC, <code>LET</code> was not an optional word. </td></tr> <tr> <td><code>NEXT <i>var</i></code> </td> <td>Perform the next iteration of a <code>FOR</code> loop. </td></tr> <tr> <td><code>PRINT</code> </td> <td>Output to the Teletype </td></tr> <tr> <td><code>READ <i>var</i>...</code> </td> <td>Read data from <code>DATA</code> statements into variables </td></tr> <tr> <td><code>REM</code> </td> <td>Short for <code>REM</code>ark, this allowed for a comment to be placed on a line </td></tr> <tr> <td><code>RESTORE [<i>line</i>]</code> </td> <td>Reset the <code>READ</code> pointer in order to re-read <code>DATA</code> </td></tr> <tr> <td><code>RETURN</code> </td> <td>Return to the line following a <code>GOSUB</code>. </td></tr></tbody></table> <p>Note in particular the lack of a <code>WHILE</code>-like statement; <code>FOR</code> was the only looping construct available to programmers. </p> <div class="mw-heading mw-heading3"><h3 id="Variables">Variables</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=3" title="Edit section: Variables"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Variable_(programming)" class="mw-redirect" title="Variable (programming)">Variable</a> names for numeric values were either a single letter, or a single letter followed by a single numeric digit, thus allowing for 286 discreet variables in total. Strings were supported; variable names for them had the same restriction but were followed by a pound (<code>£</code>) symbol. </p> <div class="mw-heading mw-heading3"><h3 id="Functions">Functions</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=4" title="Edit section: Functions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A limited number of numeric functions were provided, all of which took one numeric parameter: </p> <table class="wikitable"> <tbody><tr> <th>Function </th> <th>Function(<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle x}"></span>) returned </th></tr> <tr> <td><code>SIN</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \sin x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>sin</mi> <mo>⁡</mo> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \sin x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/09b4b55580d6a821a07ad9fe35be88976917b10b" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:4.572ex; height:2.176ex;" alt="{\displaystyle \sin x}"></span> </td></tr> <tr> <td><code>COS</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \cos x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>cos</mi> <mo>⁡</mo> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \cos x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/184ba70c3a71df25a25c09f34cd7f8175a9b5280" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:4.828ex; height:1.676ex;" alt="{\displaystyle \cos x}"></span> </td></tr> <tr> <td><code>ATN</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \arctan x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>arctan</mi> <mo>⁡</mo> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \arctan x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ea7315ab90c047f16ec0972c15e14988ed737c1f" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:8.183ex; height:2.009ex;" alt="{\displaystyle \arctan x}"></span> </td></tr> <tr> <td><code>SQR</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\sqrt {x}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <msqrt> <mi>x</mi> </msqrt> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\sqrt {x}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d62b24be305beff66cba9bfbcc01a362ba390f44" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.005ex; width:3.266ex; height:3.009ex;" alt="{\displaystyle {\sqrt {x}}}"></span> </td></tr> <tr> <td><code>LOG</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \log x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>log</mi> <mo>⁡</mo> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \log x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/80d453de713a8c45f7bf99108752531ed7d6dd05" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:4.689ex; height:2.509ex;" alt="{\displaystyle \log x}"></span> </td></tr> <tr> <td><code>EXP</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle e^{x}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msup> <mi>e</mi> <mrow class="MJX-TeXAtom-ORD"> <mi>x</mi> </mrow> </msup> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle e^{x}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/841c0d168e64191c45a45e54c7e447defd17ec6a" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.256ex; height:2.343ex;" alt="{\displaystyle e^{x}}"></span> </td></tr> <tr> <td><code>INT</code> </td> <td>The largest integer not greater than <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle x}"></span> </td></tr> <tr> <td><code>SGN</code> </td> <td>−1, 0, or 1, depending on whether <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle x}"></span> was less than, equal to, or greater than zero </td></tr> <tr> <td><code>ABS</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle -x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mo>−</mo> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle -x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/ae55e66aeffc525917eed885b4b753ba5a7f8b3e" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:3.138ex; height:2.176ex;" alt="{\displaystyle -x}"></span> if <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle x}"></span> was negative, otherwise <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle x}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>x</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle x}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/87f9e315fd7e2ba406057a97300593c4802b53e4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.33ex; height:1.676ex;" alt="{\displaystyle x}"></span> </td></tr></tbody></table> <p>Support for strings was more limited, with only one function, <code>LEN</code>, which returned the length of the string parameter. Sub-strings were supported with square brackets, so <code>A£[2,3]</code> referred to the sub-string of the string <code>A£</code> from the 2nd character to the 3rd character inclusive, so </p> <div class="mw-highlight mw-highlight-lang-basic mw-content-ltr" dir="ltr"><pre><span></span><span class="nl">10</span><span class="w"> </span><span class="kd">LET</span><span class="w"> </span><span class="vg">A</span><span class="err">£</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"FOO"</span> <span class="nl">20</span><span class="w"> </span><span class="kr">PRINT</span><span class="w"> </span><span class="vg">A</span><span class="err">£</span><span class="p">[</span><span class="il">2</span><span class="p">,</span><span class="il">3</span><span class="p">]</span> </pre></div> <p>would print <code>OO</code> </p><p>This syntax was also supported on the left-hand side of an assignment, so </p> <div class="mw-highlight mw-highlight-lang-basic mw-content-ltr" dir="ltr"><pre><span></span><span class="nl">10</span><span class="w"> </span><span class="kd">LET</span><span class="w"> </span><span class="vg">A</span><span class="err">£</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"FOO"</span> <span class="nl">20</span><span class="w"> </span><span class="kd">LET</span><span class="w"> </span><span class="vg">A</span><span class="err">£</span><span class="p">[</span><span class="il">2</span><span class="p">,</span><span class="il">2</span><span class="p">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s2">"BAR"</span> <span class="nl">30</span><span class="w"> </span><span class="kr">PRINT</span><span class="w"> </span><span class="vg">A</span><span class="err">£</span> </pre></div> <p>would print <code>FBARO</code> </p> <div class="mw-heading mw-heading3"><h3 id="Arrays">Arrays</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=5" title="Edit section: Arrays"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Support for handling arrays of data was relatively strong, with <code>MAT</code> statements able to read an entire array from <code>DATA</code> statements, and perform useful <a href="/wiki/Matrix_(mathematics)" title="Matrix (mathematics)">matrix</a> operations such as <a href="/wiki/Matrix_addition" title="Matrix addition">matrix addition</a>, <a href="/wiki/Matrix_subtraction" class="mw-redirect" title="Matrix subtraction">matrix subtraction</a>, <a href="/wiki/Matrix_multiplication" title="Matrix multiplication">matrix multiplication</a>, and finding the <a href="/wiki/Inverse_matrix" class="mw-redirect" title="Inverse matrix">inverse matrix</a> for a <a href="/wiki/Square_matrix" title="Square matrix">square matrix</a>. </p><p>Example: </p> <div class="mw-highlight mw-highlight-lang-basic mw-content-ltr" dir="ltr"><pre><span></span><span class="nl">10</span><span class="w"> </span><span class="kd">DIM</span><span class="w"> </span><span class="vg">A</span><span class="p">(</span><span class="il">3</span><span class="p">,</span><span class="il">3</span><span class="p">)</span> <span class="nl">20</span><span class="w"> </span><span class="vg">MAT</span><span class="w"> </span><span class="kr">READ</span><span class="w"> </span><span class="vg">A</span> <span class="nl">30</span><span class="w"> </span><span class="kd">DATA</span><span class="w"> </span><span class="il">1</span><span class="p">,</span><span class="il">1</span><span class="p">,</span><span class="il">2</span><span class="p">,</span><span class="il">1</span><span class="p">,</span><span class="il">0</span><span class="p">,</span><span class="il">2</span><span class="p">,</span><span class="il">0</span><span class="p">,</span><span class="il">2</span><span class="p">,</span><span class="il">1</span> <span class="nl">40</span><span class="w"> </span><span class="kd">DIM</span><span class="w"> </span><span class="vg">B</span><span class="p">(</span><span class="il">3</span><span class="p">,</span><span class="il">3</span><span class="p">)</span> <span class="nl">50</span><span class="w"> </span><span class="vg">MAT</span><span class="w"> </span><span class="kr">READ</span><span class="w"> </span><span class="vg">B</span> <span class="nl">60</span><span class="w"> </span><span class="kd">DATA</span><span class="w"> </span><span class="il">0</span><span class="p">,</span><span class="il">0</span><span class="p">,</span><span class="il">1</span><span class="p">,</span><span class="il">0</span><span class="p">,</span><span class="il">1</span><span class="p">,</span><span class="il">0</span><span class="p">,</span><span class="il">1</span><span class="p">,</span><span class="il">0</span><span class="p">,</span><span class="il">0</span> <span class="nl">70</span><span class="w"> </span><span class="kd">DIM</span><span class="w"> </span><span class="vg">C</span><span class="p">(</span><span class="il">3</span><span class="p">,</span><span class="il">3</span><span class="p">),</span><span class="vg">D</span><span class="p">(</span><span class="il">3</span><span class="p">,</span><span class="il">3</span><span class="p">)</span> <span class="nl">80</span><span class="w"> </span><span class="vg">MAT</span><span class="w"> </span><span class="vg">C</span><span class="o">=</span><span class="vg">A</span><span class="o">*</span><span class="vg">B</span> <span class="nl">90</span><span class="w"> </span><span class="vg">MAT</span><span class="w"> </span><span class="vg">D</span><span class="o">=</span><span class="vg">INV</span><span class="p">(</span><span class="vg">C</span><span class="p">)</span> <span class="nl">100</span><span class="w"> </span><span class="vg">MAT</span><span class="w"> </span><span class="kr">PRINT</span><span class="w"> </span><span class="vg">D</span><span class="p">,</span> </pre></div> <table> <tbody><tr> <td><code>A</code> is read from the first <code>DATA</code> statement </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{pmatrix}1&1&2\\1&0&2\\0&2&1\end{pmatrix}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>(</mo> <mtable rowspacing="4pt" columnspacing="1em"> <mtr> <mtd> <mn>1</mn> </mtd> <mtd> <mn>1</mn> </mtd> <mtd> <mn>2</mn> </mtd> </mtr> <mtr> <mtd> <mn>1</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>2</mn> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>2</mn> </mtd> <mtd> <mn>1</mn> </mtd> </mtr> </mtable> <mo>)</mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{pmatrix}1&1&2\\1&0&2\\0&2&1\end{pmatrix}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/b6d5cdb646cd8533f11d99f28a402bcf6124a6fd" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.005ex; width:12.951ex; height:9.176ex;" alt="{\displaystyle {\begin{pmatrix}1&1&2\\1&0&2\\0&2&1\end{pmatrix}}}"></span> </td></tr> <tr> <td><code>B</code> is read from the second <code>DATA</code> statement </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{pmatrix}0&0&1\\0&1&0\\1&0&0\end{pmatrix}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>(</mo> <mtable rowspacing="4pt" columnspacing="1em"> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mn>0</mn> </mtd> <mtd> <mn>1</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mn>1</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> </mtable> <mo>)</mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{pmatrix}0&0&1\\0&1&0\\1&0&0\end{pmatrix}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4de8d66cdb48083e3a2a320ac3219db3a304ccae" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.005ex; width:12.951ex; height:9.176ex;" alt="{\displaystyle {\begin{pmatrix}0&0&1\\0&1&0\\1&0&0\end{pmatrix}}}"></span> </td></tr> <tr> <td><code>C</code> is calculated by multiplying <code>A</code> and <code>B</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{pmatrix}2&1&1\\2&0&1\\1&2&0\end{pmatrix}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>(</mo> <mtable rowspacing="4pt" columnspacing="1em"> <mtr> <mtd> <mn>2</mn> </mtd> <mtd> <mn>1</mn> </mtd> <mtd> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mn>2</mn> </mtd> <mtd> <mn>0</mn> </mtd> <mtd> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mn>1</mn> </mtd> <mtd> <mn>2</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> </mtable> <mo>)</mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{pmatrix}2&1&1\\2&0&1\\1&2&0\end{pmatrix}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/f3591b48976ac303997d4177cc9a959b97252334" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.005ex; width:12.951ex; height:9.176ex;" alt="{\displaystyle {\begin{pmatrix}2&1&1\\2&0&1\\1&2&0\end{pmatrix}}}"></span> </td></tr> <tr> <td><code>D</code> is calculated as the inverse of <code>C</code> </td> <td><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{pmatrix}2&2&1\\1&-1&0\\4&-3&-2\end{pmatrix}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <mrow> <mo>(</mo> <mtable rowspacing="4pt" columnspacing="1em"> <mtr> <mtd> <mn>2</mn> </mtd> <mtd> <mn>2</mn> </mtd> <mtd> <mn>1</mn> </mtd> </mtr> <mtr> <mtd> <mn>1</mn> </mtd> <mtd> <mo>−</mo> <mn>1</mn> </mtd> <mtd> <mn>0</mn> </mtd> </mtr> <mtr> <mtd> <mn>4</mn> </mtd> <mtd> <mo>−</mo> <mn>3</mn> </mtd> <mtd> <mo>−</mo> <mn>2</mn> </mtd> </mtr> </mtable> <mo>)</mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\begin{pmatrix}2&2&1\\1&-1&0\\4&-3&-2\end{pmatrix}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/d1181aabfb47d941096836340e0bca90c6edcb32" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -4.005ex; width:16.567ex; height:9.176ex;" alt="{\displaystyle {\begin{pmatrix}2&2&1\\1&-1&0\\4&-3&-2\end{pmatrix}}}"></span> </td></tr></tbody></table> <p>The output would be 2 2 1 1 -1 0 4 -3 -2 </p> <div class="mw-heading mw-heading2"><h2 id="Debugging">Debugging</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=6" title="Edit section: Debugging"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Expand_section plainlinks metadata ambox mbox-small-left ambox-content" role="presentation"><tbody><tr><td class="mbox-image"><span typeof="mw:File"><a href="/wiki/File:Wiki_letter_w_cropped.svg" class="mw-file-description"><img alt="[icon]" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/20px-Wiki_letter_w_cropped.svg.png" decoding="async" width="20" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/30px-Wiki_letter_w_cropped.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Wiki_letter_w_cropped.svg/40px-Wiki_letter_w_cropped.svg.png 2x" data-file-width="44" data-file-height="31" /></a></span></td><td class="mbox-text"><div class="mbox-text-span">This section <b>needs expansion</b>. You can help by <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Southampton_BASIC_System&action=edit&section=">adding to it</a>. <span class="date-container"><i>(<span class="date">May 2009</span>)</i></span></div></td></tr></tbody></table> <p>SOBS had primitive debugging capabilities, limited mostly to the <code>TRACE</code> statement. <code>TRACE ON</code> would cause the interpreter to print each line number as it was executed. </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Southampton_BASIC_System&action=edit&section=7" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFReesOppenheimer1977" class="citation journal cs1">Rees, M.J.; Oppenheimer, A.W. (21 January 1977). <a rel="nofollow" class="external text" href="https://archive.today/20130105083634/http://www3.interscience.wiley.com/journal/113444749/abstract?CRETRY=1&SRETRY=0">"SOBS – an incremental BASIC system"</a>. <i>Software: Practice and Experience</i>. <b>7</b> (5). Wiley InterScience: 631–643. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2Fspe.4380070508">10.1002/spe.4380070508</a>. <a href="/wiki/S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:33989728">33989728</a>. Archived from <a rel="nofollow" class="external text" href="http://www3.interscience.wiley.com/journal/113444749/abstract?CRETRY=1&SRETRY=0">the original</a> on 5 January 2013<span class="reference-accessdate">. Retrieved <span class="nowrap">18 May</span> 2009</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Software%3A+Practice+and+Experience&rft.atitle=SOBS+%E2%80%93+an+incremental+BASIC+system&rft.volume=7&rft.issue=5&rft.pages=631-643&rft.date=1977-01-21&rft_id=info%3Adoi%2F10.1002%2Fspe.4380070508&rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A33989728%23id-name%3DS2CID&rft.aulast=Rees&rft.aufirst=M.J.&rft.au=Oppenheimer%2C+A.W.&rft_id=http%3A%2F%2Fwww3.interscience.wiley.com%2Fjournal%2F113444749%2Fabstract%3FCRETRY%3D1%26SRETRY%3D0&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASouthampton+BASIC+System" class="Z3988"></span></span> </li> </ol></div></div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist 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style="padding:0 0.25em"> <ul><li><a href="/wiki/BASIC-PLUS" title="BASIC-PLUS">BASIC-PLUS</a></li> <li><a href="/w/index.php?title=Extra!_Basic_Macro_Language&action=edit&redlink=1" class="new" title="Extra! Basic Macro Language (page does not exist)">Extra! Basic Macro Language</a></li> <li><a href="/wiki/VSI_BASIC_for_OpenVMS" title="VSI BASIC for OpenVMS">VSI BASIC for OpenVMS</a></li> <li><a href="/wiki/SUPER_BASIC" title="SUPER BASIC">SUPER BASIC</a></li> <li><a href="/wiki/CALL/360:BASIC" title="CALL/360:BASIC">CALL/360:BASIC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AlphaBasic" title="AlphaBasic">AlphaBasic</a></li> <li><a href="/wiki/Astro_BASIC" class="mw-redirect" title="Astro BASIC">Astro BASIC</a></li> <li><a href="/wiki/BASICODE" title="BASICODE">BASICODE</a></li> <li><a href="/wiki/Business_application_language" title="Business application language">BAL</a></li> <li><a href="/wiki/Casio_BASIC" title="Casio BASIC">Casio BASIC</a></li> <li><a href="/wiki/CBASIC" title="CBASIC">CBASIC</a></li> <li><a href="/wiki/PBASIC" title="PBASIC">PBASIC</a></li> <li><a href="/wiki/SDS_BASIC" title="SDS BASIC">SDS BASIC</a></li> <li><a href="/wiki/Tiny_BASIC" title="Tiny BASIC">Tiny BASIC</a></li> <li><a href="/wiki/UBASIC" title="UBASIC">UBASIC</a></li> <li><a href="/wiki/ZBasic" title="ZBasic">ZBasic</a></li> <li><a href="/w/index.php?title=ETBASIC&action=edit&redlink=1" class="new" title="ETBASIC (page does not exist)">ETBASIC</a><span class="noprint" style="font-size:85%; font-style: normal;"> [<a href="https://zh.wikipedia.org/wiki/ETBASIC" class="extiw" title="zh:ETBASIC">zh</a>]</span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/BASIC_extension" title="BASIC extension">Extenders</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/BASIC_8" title="BASIC 8">BASIC 8</a></li> <li>Graphics BASIC</li> <li><a href="/wiki/Simons%27_BASIC" title="Simons' BASIC">Simons' BASIC</a></li> <li><a href="/wiki/Super_Expander" title="Super Expander">Super Expander</a></li> <li><a href="/wiki/Super_Expander_64" title="Super Expander 64">Super Expander 64</a></li> <li><a href="/wiki/YS_MegaBasic" title="YS MegaBasic">YS MegaBasic</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Procedural_programming" title="Procedural programming">Procedure</a>-<br />oriented</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AmigaBASIC" class="mw-redirect" title="AmigaBASIC">AmigaBASIC</a></li> <li><a href="/wiki/AMOS_(programming_language)" title="AMOS (programming language)">AMOS BASIC</a></li> <li><a href="/wiki/ASIC_programming_language" title="ASIC programming language">ASIC</a></li> <li><a href="/wiki/BasicX" title="BasicX">BasicX</a></li> <li><a href="/wiki/Beta_BASIC" title="Beta BASIC">Beta BASIC</a></li> <li><a href="/wiki/FutureBASIC" title="FutureBASIC">FutureBASIC</a></li> <li><a href="/wiki/GRASS_(programming_language)" title="GRASS (programming language)">GRASS</a></li> <li><a href="/wiki/Liberty_BASIC" title="Liberty BASIC">Liberty BASIC</a></li> <li><a href="/wiki/LSE_(programming_language)" title="LSE (programming language)">LSE</a></li> <li><a href="/wiki/MapBasic" title="MapBasic">MapBasic</a></li> <li><a href="/wiki/Mobile_BASIC" title="Mobile BASIC">Mobile BASIC</a></li> <li><a href="/wiki/OWBasic" title="OWBasic">OWBasic</a></li> <li><a href="/wiki/PowerBASIC" title="PowerBASIC">PowerBASIC</a></li> <li><a href="/wiki/PureBasic" title="PureBasic">PureBasic</a></li> <li><a href="/wiki/Petit_Computer" title="Petit Computer">SmileBASIC</a></li> <li><a href="/wiki/Tiger-BASIC" title="Tiger-BASIC">Tiger-BASIC</a></li> <li><a href="/wiki/True_BASIC" title="True BASIC">True BASIC</a></li> <li><a href="/wiki/Turbo_Basic" class="mw-redirect" title="Turbo Basic">Turbo Basic</a></li> <li><a href="/wiki/WordBASIC" title="WordBASIC">WordBASIC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Free_and_open_source" class="mw-redirect" title="Free and open source">Free and<br />open source</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Basic-256" title="Basic-256">Basic-256</a></li> <li><a href="/wiki/Basic4GL" title="Basic4GL">Basic4GL</a></li> <li><a href="/wiki/BBC_BASIC#Acorn_Archimedes_(RISC_OS)" title="BBC BASIC">BBC BASIC V</a></li> <li><a href="/wiki/The_Game_Creators" title="The Game Creators">DarkBASIC</a></li> <li><a href="/wiki/Euphoria_(programming_language)" title="Euphoria (programming language)">Euphoria</a></li> <li><a href="/wiki/Hindawi_Programming_System" title="Hindawi Programming System">Indic BASIC</a></li> <li><a href="/wiki/Open_Programming_Language" title="Open Programming Language">Open Programming Language</a></li> <li><a href="/wiki/SdlBasic" title="SdlBasic">SdlBasic</a></li> <li><a href="/wiki/SmallBASIC" title="SmallBASIC">SmallBASIC</a></li> <li><a href="/wiki/QB64" title="QB64">QB64</a></li> <li><a href="/wiki/WxBasic" title="WxBasic">wxBasic</a></li> <li><a href="/wiki/XBasic" title="XBasic">XBasic</a></li> <li><a href="/wiki/XBLite" title="XBLite">Xblite</a></li> <li><a href="/wiki/Yabasic" title="Yabasic">Yabasic</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">With <a href="/wiki/Object-oriented_programming" title="Object-oriented programming">object</a><br />extensions</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/AutoIt" title="AutoIt">AutoIt</a></li> <li><a href="/wiki/Chipmunk_Basic" title="Chipmunk Basic">Chipmunk Basic</a></li> <li><a href="/wiki/GLBasic" title="GLBasic">GLBasic</a></li> <li><a href="/wiki/LotusScript" title="LotusScript">LotusScript</a></li> <li><a href="/wiki/Morfik" title="Morfik">Morfik</a></li> <li><a href="/wiki/PowerBASIC" title="PowerBASIC">PowerBASIC</a></li> <li>ProvideX</li> <li>Run BASIC</li> <li><a href="/wiki/Visual_Basic_for_Applications" title="Visual Basic for Applications">VBA</a></li> <li><a href="/wiki/VBScript" title="VBScript">VBScript</a></li> <li>VB 5 for <a href="/wiki/Microsoft_Excel" title="Microsoft Excel">Microsoft Excel</a> 5.0 <ul><li><a href="/wiki/Visual_Studio_Tools_for_Office" title="Visual Studio Tools for Office">VSTO</a></li> <li><a href="/wiki/Visual_Studio_Tools_for_Applications" title="Visual Studio Tools for Applications">VSTA</a></li></ul></li> <li><a href="/wiki/Embedded_Visual_Basic" title="Embedded Visual Basic">Embedded Visual Basic</a></li> <li>WinWrap Basic</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Free_and_open_source" class="mw-redirect" title="Free and open source">Free and<br />open source</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Blitz_BASIC" title="Blitz BASIC">BlitzMax</a></li> <li><a href="/wiki/FreeBASIC" title="FreeBASIC">FreeBASIC</a></li> <li><a href="/wiki/Microsoft_Small_Basic" title="Microsoft Small Basic">Microsoft Small Basic</a></li> <li><a href="/wiki/Mono_(software)" title="Mono (software)">Mono-Basic</a></li> <li><a href="/wiki/OpenOffice_Basic" title="OpenOffice Basic">OpenOffice Basic</a></li> <li>ScriptBasic</li> <li><a href="/wiki/Roslyn_(compiler)" title="Roslyn (compiler)">Roslyn</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Rapid_application_development" title="Rapid application development">RAD</a><br /><a href="/wiki/GUI_designer" class="mw-redirect" title="GUI designer">designers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Proprietary_software" title="Proprietary software">Proprietary</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/CA-Realizer" title="CA-Realizer">CA-Realizer</a></li> <li><a href="/wiki/Visual_Basic_(classic)" title="Visual Basic (classic)">Visual Basic (classic)</a></li> <li><a href="/wiki/NS_Basic" title="NS Basic">NS Basic</a></li> <li><a href="/wiki/RapidQ" title="RapidQ">RapidQ</a></li> <li><a href="/wiki/Visual_Basic_(.NET)" title="Visual Basic (.NET)">Visual Basic .NET</a> (<a href="/wiki/Mercury_(RemObjects_BASIC_programming_language)" title="Mercury (RemObjects BASIC programming language)">Mercury</a>)</li> <li><a href="/wiki/Xojo" title="Xojo">Xojo</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Free_and_open_source" class="mw-redirect" title="Free and open source">Free and<br />open source</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>B4X (<a href="/wiki/Basic4android" title="Basic4android">Basic4android</a>, <a href="/wiki/Basic4ppc" title="Basic4ppc">Basic4ppc</a>)</li> <li><a href="/wiki/Gambas" title="Gambas">Gambas</a></li> <li><a href="/wiki/FreeBASIC" title="FreeBASIC">WinFBE, Visual FB Editor</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Defunct</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Altair_BASIC" title="Altair BASIC">Altair BASIC</a></li> <li><a href="/wiki/Applesoft_BASIC" title="Applesoft BASIC">Applesoft BASIC</a></li> <li><a href="/wiki/Atari_BASIC" title="Atari BASIC">Atari BASIC</a></li> <li><a href="/wiki/Atari_Microsoft_BASIC" title="Atari Microsoft BASIC">Atari Microsoft BASIC</a></li> <li><a href="/wiki/Atari_ST_BASIC" title="Atari ST BASIC">Atari ST BASIC</a></li> <li><a href="/wiki/BASIC_A%2B" title="BASIC A+">BASIC A+</a></li> <li><a href="/wiki/Optimized_Systems_Software#BASIC_XE" title="Optimized Systems Software">BASIC XE</a></li> <li><a href="/wiki/Optimized_Systems_Software#BASIC_XL" title="Optimized Systems Software">BASIC XL</a></li> <li><a href="/wiki/BASIC_Programming" title="BASIC Programming"><i>BASIC Programming</i> (Atari 2600)</a></li> <li><a href="/wiki/BBC_BASIC" title="BBC BASIC">BBC BASIC</a></li> <li><a href="/wiki/Benton_Harbor_BASIC" title="Benton Harbor BASIC">Benton Harbor BASIC</a></li> <li><a href="/wiki/Chinese_BASIC" title="Chinese BASIC">Chinese BASIC</a></li> <li><a href="/wiki/Commodore_BASIC" title="Commodore BASIC">Commodore BASIC</a></li> <li><a href="/wiki/Color_BASIC" title="Color BASIC">Color BASIC</a></li> <li><a href="/wiki/Dartmouth_BASIC" title="Dartmouth BASIC">Dartmouth BASIC</a></li> <li><a href="/wiki/Disk_Extended_Color_BASIC" title="Disk Extended Color BASIC">Disk Extended Color BASIC</a></li> <li><a href="/wiki/Extended_Color_BASIC" title="Extended Color BASIC">Extended Color BASIC</a></li> <li><a href="/wiki/Family_BASIC" title="Family BASIC">Family BASIC</a></li> <li><a href="/wiki/GFA_BASIC" title="GFA BASIC">GFA BASIC</a></li> <li><a href="/wiki/GW-BASIC" title="GW-BASIC">GW-BASIC</a></li> <li><a href="/wiki/IBM_BASIC" title="IBM BASIC">IBM BASIC</a></li> <li><a href="/wiki/JR-BASIC" title="JR-BASIC">JR-BASIC</a></li> <li><a href="/wiki/MacBASIC" title="MacBASIC">MacBASIC</a></li> <li><a href="/wiki/MBASIC" title="MBASIC">MBASIC</a></li> <li><a href="/wiki/MSX_BASIC" title="MSX BASIC">MSX BASIC</a></li> <li><a href="/wiki/MS_BASIC_for_Macintosh" title="MS BASIC for Macintosh">MS BASIC for Macintosh</a></li> <li><a href="/wiki/QBasic" title="QBasic">QBasic</a></li> <li><a href="/wiki/QuickBASIC" title="QuickBASIC">QuickBASIC</a></li> <li><a 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