Editing Sinclair BASIC (section)

==Official versions==
===4K BASIC===
''4K BASIC'' for ZX80<ref>{{Cite web|url=https://www.petervis.com/Sinclair/Sinclair_ZX80_Manual/4k-basic.html|title = Sinclair ZX80 User Manual 4K Basic for ZX80}}</ref> (so named for residing in 4&nbsp;[[kibibyte|KiB]] [[read-only memory]] (ROM)), was developed by John Grant of Nine Tiles for the ZX80. It has integer-only arithmetic.
* System Commands: <code>NEW</code> <code>RUN</code> <code>LIST</code> <code>LOAD</code> <code>SAVE</code>
* Control Statements: <code>GOTO</code> <code>IF</code> <code>THEN</code> <code>GOSUB</code> <code>STOP</code> <code>RETURN</code> <code>FOR</code> <code>TO</code> <code>NEXT</code> <code>CONTINUE</code>
* Input/Output Statements: <code>PRINT</code> <code>INPUT</code>
* Assignment Statement: <code>LET</code>
* Other Statements: <code>CLEAR</code> <code>CLS</code> <code>DIM</code> <code>REM</code> <code>RANDOMIZE</code> <code>POKE</code>
* Functions: <code>ABS</code> <code>CHR$</code> <code>CODE</code><code>PEEK</code> <code>RND</code> <code>STR$</code> <code>TL$</code> <code>USR</code>

===8K BASIC===
''8K BASIC'' is the ZX81 BASIC (also available as an upgrade for the ZX80<ref name="8Kupgrade" />), updated with floating-point arithmetic by [[Steve Vickers (computer scientist)|Steve Vickers]], so named for residing in 8&nbsp;KiB ROM.
* Statements: <code>PRINT</code> <code>RAND</code> <code>LET</code> <code>CLEAR</code> <code>RUN</code> <code>LIST</code> <code>GOTO</code> <code>CONT</code> <code>INPUT</code> <code>NEW</code> <code>REM</code> <code>PRINT</code> <code>STOP</code> <code>BREAK</code> <code>IF</code> <code>STOP</code> <code>FOR</code> <code>NEXT</code> <code>TO</code> <code>STEP</code> <code>SLOW</code> <code>FAST</code> <code>GOSUB</code> <code>RETURN</code> <code>SAVE</code> <code>LOAD</code> <code>CLS</code> <code>SCROLL</code> <code>PLOT</code> <code>UNPLOT</code> <code>PAUSE</code> <code>LPRINT</code> <code>LLIST</code> <code>COPY</code> <code>DIM</code> <code>POKE</code> <code>NEW</code>
* Functions: <code>ABS</code>  <code>SGN</code> <code>SIN</code>  <code>COS</code> <code>TAN</code>  <code>ASN</code> <code>ACS</code>  <code>ATN</code> <code>LN</code>  <code>EXP</code> <code>SQR</code>  <code>INT</code>  <code>PI</code>  <code>RND</code>  <code>FUNCTION</code>  <code>LEN</code>  <code>VALSTR$</code>  <code>NOT</code>  <code>CODE</code>  <code>CHR$</code>  <code>INKEY$</code>  <code>AT</code>  <code>TAB</code>  <code>INKEY$</code>  <code>PEEK</code>  <code>USR</code>

===48 BASIC===
''48 BASIC'' is the BASIC for the original 16/48&nbsp;KB [[random-access memory|RAM]] ZX Spectrum (and clones), with colour and more peripherals added by Steve Vickers and John Grant. It resides in 16&nbsp;KB ROM and began to be called 48 BASIC with the introduction of the ZX Spectrum 128 at which time the 16&nbsp;KB Spectrum was no longer sold and most existing ones in use had been upgraded to 48&nbsp;KB.<ref name="worldofspectrum.org">{{Cite web|url=https://worldofspectrum.org/ZXSpectrum128+3Manual/chapter7.html|title=World of Spectrum - Documentation - ZX Spectrum +3 - Chapter 7|website=worldofspectrum.org}}</ref>

===128 BASIC===
''128 BASIC'' is the BASIC for the ZX Spectrum 128.<ref name=":0">{{Cite web|url=https://worldofspectrum.org/ZXSpectrum128Manual/sp128p06.html|title=World of Spectrum - Documentation - ZX Spectrum 128 Manual Page 6|website=worldofspectrum.org}}</ref> It offers extra commands and uses letter-by-letter input.
* New commands: <code>LOAD !</code> <code>SAVE !</code> <code>MERGE !</code> <code>ERASE !</code> <code>PLAY</code> <code>SPECTRUM</code>

===+3 BASIC===
''+3 BASIC'' is the BASIC with disk support for the ZX Spectrum +3 and +2A.<ref name="worldofspectrum.org" />
* New commands: <code>FORMAT</code> <code>COPY</code>

===T/S 2000 BASIC===
''T/S 2000 BASIC'' is used on the Spectrum-compatible [[Timex Sinclair 2068]] (T/S 2068) and adds the following six new keywords:
* <code>DELETE</code> deletes BASIC program line ranges.<!-- {{keypress|CAPS&nbsp;SHIFT|0}} with the <code>K</code> cursor produces the command <code>DELETE</code>.-->
* <code>FREE</code> is a function that gives the amount of free RAM. <code>PRINT FREE</code> will show how much RAM is free.
* <code>ON ERR</code> is an error-handling function mostly used as <code>ON ERR GO TO</code> or <code>ON ERR CONT</code>.
* <code>RESET</code> can be used to reset the behaviour of <code>ON ERR</code>. It was also intended to reset peripherals.
* <code>SOUND</code> controls the [[General Instrument AY-3-8910|AY-3-8192]] [[sound chip]].
* <code>STICK</code> is a function that gives the position of the internal joystick (Timex Sinclair 2090).

===BASIC64===
''BASIC64'' by [[Timex of Portugal]], is a [[software extension]]<ref>{{Cite web|url=http://timex.comboios.info/tmxtechb64-2048.html|title=Timex tech info – Basic 64 for TC2048|website=timex.comboios.info}}</ref> to allow better Basic programming with the 512×192 and dual display areas graphic modes available only on [[Timex Sinclair]] computers. This extension adds commands and does a complete memory remap to avoid the system overwriting the extended screen memory area. Two versions exist due to different memory maps – a version for [[TC 2048]] and a version for T/S 2068 and [[TC 2068]].
* <code>PRINT #</code> prints to a specific output channel.
* <code>LIST #</code> lists the program to a specific output channel.
* <code>CLS*</code> clears both display areas.
* <code>INK*</code> sets ink colour for both display areas
* <code>PAPER*</code> sets paper colour both display areas
* <code>SCREEN$</code> selects the high / normal resolution modes.
* <code>PLOT*</code> plots a pixel and updates the drawing position.
* <code>LINE</code> draws a line from the previous PLOT position, supporting arc drawing
* <code>CIRCLE*</code> draws a circle or oval, depending on screen mode.

===Timex Extended Basic===
''Timex Extended Basic'' by Timex of Portugal is used on the [[Timex Computer 3256]], adding ''TEC – Timex Extended Commands'' commands supporting the AY-3-8912 sound chip, RS-232 network and the 512x192 pixel high resolution graphic mode.<ref>{{Cite web|url=https://loadzx.com/wp-content/uploads/simple-file-list/LITERATURA/JORNAIS/Microsete/Microsete-n46.pdf|title=Microsete N.º46, Maio 1987|website=loadzx.com}}</ref><ref>{{Cite web|url=https://k1.spdns.de/Vintage/Sinclair/82/Timex%20Computer%203256%20(unreleased)/|title=Timex Computer 3256, Timex Portugal|website=k1.spdns.de}}</ref>
* RAM drive commands: <code>LOAD!</code> <code>SAVE!</code> <code>CAT!</code> <code>MERGE!</code> <code>ERASE!</code> <code>CLEAR!</code>
* RS-232 commands: <code>FORMAT!</code> <code>LPRINT</code> <code>LLIST</code>
* AY-3-8912 commands: <code>BEEP!</code>
* 512 x 192 resolution commands: <code>SCREEN$</code> <code>DRAW!</code> <code>PLOT!</code> <code>CIRCLE!</code>