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Stefan ArentzandClaude Fable 5
235da01007
Ports the machine half of two.c and the language card: - two.rs: Two implements Bus with the ewm_two_init memory map — 48K RAM, the six AppleSoft/Autostart ROMs at $D000-$FFFF (embedded), and the full $C000-$C07F soft-switch dispatch: keyboard latch and strobe, TEXT/GRAPHICS, LGR/HGR, FULL/MIXED, PAGE1/PAGE2, speaker toggle recording at $C030, annunciators, buttons $C060-$C063, and the paddle trigger/timers at $C070/$C064-$C065 (including two.c's PADL1 never clearing its timer). apple2 and apple2e return an error, per quirk #4. Speaker and paddle timestamps come from a cycles field the run loop mirrors from cpu.counter, since the C handlers read cpu->counter and the Bus trait has no CPU access. - two.rs: Two::text_screen() decodes the interleaved $0400 text page — the workhorse assertion helper for all later headless gates. - alc.rs: the language card from alc.c as plain state consulted by Two's bus dispatch: bank select on bit 3, write-enable only after two consecutive switch reads (writes reset the count and the $C081/$C083 read cases preserve a previously enabled write flag), reads falling through to ROM when read-disabled, and writes swallowed when write-disabled. - tests/two_boot.rs: boots to the APPLE ][ banner and ] prompt with no disk card, types PRINT 2+2 through the key latch and asserts 4; plus language-card tests for initial state, double-read write enable, count reset on switch write, bank separation and shared $E000 RAM, cycle-stamped speaker toggles, and the apple2/apple2e error. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>