Editing Commodore BASIC (section)

==Versions and features==
A list of CBM BASIC versions in chronological order, with successively added features:

===Released versions===
* V1.0: PET 2001 with [[chiclet keyboard]] and built-in [[Commodore Datassette|Datassette]] (original PET)
** arrays limited to 256 elements
** [[PEEK and POKE|PEEK]] command explicitly disabled over BASIC ROM locations above $C000
* V2.0 (first release): PET 2001 with full-travel keyboard & upgrade ROMs
** add [[IEEE-488]] support
** improved the garbage collection<ref name="zimmers.net">{{cite web|url=http://www.zimmers.net/anonftp/pub/cbm/firmware/README.txt|title=BASIC 4.0 Memory Map|website=zimmers.net|access-date=21 August 2023}}</ref>
** fix array bug
** Easter egg – entering {{kbd|WAIT6502, ''[number]''}} displays {{mono|MICROSOFT!}} an arbitrary number of times
* V4.0: PET/CBM 4000/8000 series (and late version PET 2001s)
** [[Commodore DOS|disk operations]]: {{mono|DLOAD,DSAVE,COPY,SCRATCH,}} etc. (15 in all)
** disk error-channel variables: {{mono|DS,DS$}}
** greatly improved garbage-collection performance<ref name="zimmers.net"/>
* V2.0 (second release, after 4.0): [[VIC-20]]; [[Commodore 64|C64]]
* V2.2 [[Commodore 64 Games System|C64GS]] (1990)
* V4+ : [[Commodore CBM-II|CBM-II]] series (aka B, P range)
** memory management: {{mono|BANK}}
** [[Commodore DOS|more disk operations]]: {{mono|[[BLOAD]], [[BSAVE]],DCLEAR}}
** formatted printing: {{mono|PRINT USING,PUDEF}}
** error trapping: {{mono|DISPOSE}}
** alternative branching: {{mono|ELSE}}
** dynamic error handling: {{mono|TRAP,RESUME,ERR$()}}
** flexible {{mono|DATA}} read: <code>RESTORE ''[line number]''</code>
** string search function: {{mono|INSTR}}
* V3.5: [[Commodore 16|C16/116]], [[Commodore Plus/4|Plus/4]]
** sound and graphics commands
** [[joystick]] input: {{mono|JOY}}
** [[decimal]] ↔ [[hexadecimal]] conversion: {{mono|DEC(),HEX$()}}
** structured looping: {{mono|DO,LOOP,WHILE,UNTIL,EXIT}}
** function key assignment: {{mono|KEY}} (also direct mode)
** program entry/editing: {{mono|AUTO,DELETE,RENUMBER}}
** [[debug]]ging (tracing): {{mono|[[TRON command|TRON]], [[TROFF]]}}
** [[machine code monitor|MLM]] entry command: {{mono|MONITOR}}
** C(1)16, Plus/4 Easter egg – enter {{kbd|SYS 52650}}
* V7.0: [[Commodore 128|C128]]
** more sound and graphics commands, including [[sprite (computer graphics)|sprite]] handling
** built-in sprite editor: {{mono|SPRDEF}}
** multi-statement blocks for {{mono|IF THEN ELSE}} structures: {{mono|BEGIN,BEND}}
** [[paddle (game controller)|paddle]], [[lightpen]] input: {{mono|POT,PEN}}
** [[exclusive disjunction|exclusive or]] function: {{mono|XOR}}
** get variable address: {{mono|POINTER}}
** text mode windowing: {{mono|WINDOW}}
** controlled time delay: {{mono|SLEEP}}
** memory management: {{mono|SWAP,FETCH,STASH,FRE(1)}}
** used the 128's [[bank switching]] to store program code separately from variables. Variable values would be preserved across program executions if the program was started with the GOTO command.
** [[Commodore DOS|more disk operations]]: {{mono|BOOT,DVERIFY}}
** CPU speed adjustment: {{mono|FAST,SLOW}} (2 vs 1&nbsp;MHz)
** enter C64 mode: {{mono|GO64}}
** undocumented, working: {{mono|RREG}} (read CPU registers after a {{mono|SYS}})
** unimplemented commands: {{mono|OFF,QUIT}}
** C128 Easter egg – enter {{kbd|SYS 32800,123,45,6}}

===Unreleased versions===
* V3.6 : [[Commodore LCD]] (unreleased prototype). Almost identical to V7.0, with the following differences:<ref>{{cite web|url=http://mikenaberezny.com/2008/10/04/commodore-lcd-firmware/|title=Mike Naberezny – Commodore LCD Firmware|website=mikenaberezny.com|access-date=8 August 2018}}</ref>
** {{mono|VOLUME}} instead of {{mono|VOL}}
** {{mono|EXIT}} instead of {{mono|QUIT}}
** {{mono|FAST,SLOW}} commands not present
** Additional command: {{mono|POPUPS}}
* V10 : [[Commodore 65]] (unreleased prototype)
** graphics/video commands: {{mono|PALETTE,GENLOCK}}
** [[computer mouse|mouse]] input: {{mono|MOUSE,RMOUSE}}
** text file ({{mono|SEQ}}) utility: {{mono|TYPE}}
** program editing: {{mono|FIND,CHANGE}}
** memory management: {{mono|DMA,FRE(2)}}
** unimplemented commands: {{mono|PAINT,LOCATE,SCALE,WIDTH,SET,VIEWPORT,PASTE,CUT}}