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Stefan ArentzandClaude Fable 5
55e5511154
Ports the machine layer for the One: - pia.rs: the 6820 PIA from pia.c. The C output callback becomes a return value — Pia::write yields (ddr, byte) when an output register is written — and reads keep the IRQA1-clear side effect. - one.rs: One implements Bus with the C memory map (Apple 1: 8K RAM + Woz monitor ROM at $FF00 on a 6502; Replica 1: 32K RAM + Krusader ROM at $E000 on a 65C02; PIA at $D010). ROMs are embedded with include_bytes! so nothing needs to run from src/. Display bytes are collected in a drainable buffer, with the Apple 1's 7-bit masking applied exactly where ewm_one_pia_callback did. One::key latches key | 0x80 into the PIA and raises IRQA1, per ewm_one_keydown. - tests/one_boot.rs: both machines boot to the Woz monitor prompt; FF00.FF0F (Apple 1) and E000.E00F (Replica 1) dumps are verified against the actual ROM bytes; typed characters echo back. utl.c is not ported: ewm_utl_endswith is str::ends_with, and the clock_gettime shim is obsolete. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>