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Stefan ArentzandClaude Fable 5
6b143cbc3f
Ports cpu.c, mem.c, and the 6502 half of ins.c to rust/ewm-core: - bus.rs: the Bus trait (replacing the mem_t linked list) and a flat 64K TestBus for the CPU test harness - cpu.rs: registers, separate raw-valued flag fields packed/unpacked only in status()/set_status(), stack ops with u8 sp wraparound, reset/irq/nmi (keeping the pc+1 interrupt push quirk the Dormann tests depend on), strict-mode stack overflow checks, and step() with pc advanced before handler dispatch - ins.rs: the 3-variant Handler arity enum, addressing-mode and RMW helpers ported expression-for-expression from mem.c (including the indx zero-page wrap and the indy non-wrap), ~200 handlers in ins.c source order, and the 256-entry table transcribed verbatim - tests/dormann.rs: the cpu_test.c harness (success PC $3399, branch-to-self deadlock detection) plus unit tests for status round-trip, stack wraparound, and the indexed-indirect quirks The Rust core executes 88,957,316 cycles for the functional test — exactly the C emulator's count. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>