Add a TinyBASIC implementation. #3

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bcox merged 3 commits from tinybasic into main 2026-03-25 20:11:45 +00:00

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bcox commented 2026-03-25 20:11:33 +00:00

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This adds an integer TinyBASIC implementation.

This adds an integer TinyBASIC implementation.

bcox added 3 commits 2026-03-25 20:11:33 +00:00

Add TinyBASIC interpreter for SBC7 ... b1fe44ba5f

Line-numbered integer BASIC inspired by Li-Chen Wang's Palo Alto Tiny
BASIC (1976). 14-bit unsigned arithmetic, 26 variables (A-Z), recursive
descent expression parser, FOR/NEXT loops, GOSUB subroutines, INPUT,
IF/THEN, and two built-in functions (ABS, RND).

Includes beginner-oriented documentation, two sample programs (number
guessing game, multiplication table), and a `just basic` build recipe.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Fix console scroll clobbering registers and other TinyBASIC issues ... 887ccf31c1

_console_scroll now saves/restores CD and EF, fixing register
corruption when scroll was called from the LF and TAB fast paths
(which don't push CD/EF themselves). This was causing TinyBASIC
programs to be silently corrupted after enough output to trigger
scrolling.

To reclaim the 4 bytes needed for the extra PUSH/POP pairs:
- Refactored putchar_addr to call clear_row_start instead of
  duplicating the row-address calculation (saves 6 bytes)
- Removed redundant LD A,#0 in _blink_disabled (saves 2 bytes)

Also fixes:
- EXITSYS macro uses RST 0 instead of RET (both rom and tinybasic)
- GOXY macro whitespace (tab vs spaces)
- TinyBASIC input now folds lowercase a-z to uppercase A-Z

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Allow build and test skills in local settings ... be107ab6ff

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bcox merged commit ce201de29a into main 2026-03-25 20:11:45 +00:00

bcox referenced this pull request from a commit 2026-03-25 20:11:47 +00:00

Merge pull request 'Add a TinyBASIC implementation.' (#3) from tinybasic into main

bcox deleted branch tinybasic 2026-03-25 20:11:58 +00:00

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bcox/sbc7!3

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