open-roms/doc/Extended-BASIC-TODO.md

Planned BASIC features, when V2 compatibility is reached

Ideas for the future, most of them suitable for MEGA65 or other power machines only

• sound support
• 2D graphics support
• turtle graphics
• sprite support, including collision callback
• custom character set support
• sprite/character design within program, in a way similar to Simons BASIC
• joystick/mouse/lightpen/paddle commands/functions
• matrix operations
• DISPOSE with variable/array as parameter should remove the variable/array from memory
• BLOAD, BVERIFY and BSAVE should have syntax compatible with BASIC V7/V10
• it should be possible to intercept Kernal errors from BASIC (prevent ?FILE NOT FOUND ERROR IN ..., etc.); ON ERROR GOTO ?
• support for numbers in hexadecimal and binary formats
• CGOTO and CGOSUB - computatiuonal versions, should accept expressions
• LABEL, LGOTO and LGOSUB - jump to label
• some kind of subroutines with local variable namespace, possibly loaded from disc (like in Warsaw Basic 3.2)
• for MEGA65 mode, move variables to a separate memory area, consider extending variable name length
• ←V (verify from tape) - if Kernal is extended to offer this feature
• modulo function or opeerator
• DPEEK, DPOKE, QPEEK, QPOKE - 2/4 byte PEEK and POKE variants
• all the functions/commands accepting memory addresses should be able to access the whole MEGA65 memory
• ability to limit memory used by basic to standard 38K or to 46K (memory model switch)
• XOR operator
• AUTO - line auto numbering
• RENUMBER for chanign the line numbers
• consider BOOT command
• possibly some commands for creating menus and dialog boxes
• more configurable INPUT
• PRINT USING, ability to position cursor, ability to print result in the center of the screen
• CURSOR command from BASIC V10
• RESTORE should accept lline number as argument
• hex/dec conversion functions
• DELETE command to delete several BASIC lines, as in BASIC V10
• FOR loop should accept integer variable as index
• FETCH, STASH, SWAP - REU support
• DMA command for MEGA65
• geoRAM support
• DO ... LOOP, DO ... UNTIL, DO ... WHILE, EXIT
• SEEK# to read-and-forget n bytes
• RECORD# command from BASIC V10
• GETKEY from BASIC V10
• HELP command from BASIC V7/V10
• function to find substring position
• WINDOW command from BASIC V7
• functions to return cursor position
• TRAP and RESUME
• SET DEF and SET DISK from BASIC V10
• SLEEP from BASIC V10
• TRON / TROFF - program tracing
• TYPE command from BASIC V10
• RUN should be able to run program from device, as in BASIC V10
• PAGE and DELAY commands from Simons BASIC, or something similar
• DUMP command from Simons BASIC, or something similar
• it should be possbile to assign to TI special variable
• function to insert a substring starting from given position
• function to generate string of n duplicated characters
• function to retrieve fractional part of a number
• command to fill text screen area with a character, inverse screen area, scroll, or change fg/bg color of screen area

Features not planned

• ELSE - it would have slown down the execution, can be easily substituted
• BEGIN ... BEND - similarly, using these would hurt the performance