42 Commits

Author	SHA1	Message	Date
Thomas Harte	fe79a1231d	Add extra cycle to immediate decimal arithmetic.	2025-10-24 21:39:14 -04:00
Thomas Harte	76a5872d17	Install extra cycle for 65c02 decimal arithmetic.	2025-10-24 21:24:05 -04:00
Thomas Harte	2e0e89c494	Implement fast modify path; fix more NOPs.	2025-10-24 16:43:57 -04:00
Thomas Harte	48f8ddf53a	65c02: make AbsoluteIndexed modify cycle harmless.	2025-10-24 15:55:45 -04:00
Thomas Harte	9aae07b737	Implement zero indirect addressing mode.	2025-10-24 15:53:55 -04:00
Thomas Harte	d7abdc8017	Transfer ownership of final PC increment, to accomodate 65c02 misreads.	2025-10-24 15:49:17 -04:00
Thomas Harte	cb81156835	65c02: distinguish 'fast' NOPs from regular.	2025-10-24 13:52:32 -04:00
Thomas Harte	e4fe127444	Fix 65c02 modify cycles: read/read/write, not read/write/write.	2025-10-24 13:30:10 -04:00
Thomas Harte	58f7d4065c	65c02: support single-cycle NOP.	2025-10-24 12:29:53 -04:00
Thomas Harte	5dc00a2092	Update #undef list.	2025-10-24 12:00:22 -04:00
Thomas Harte	b20d489bf0	Remove SHA/SHX/etc.	2025-10-24 11:58:55 -04:00
Thomas Harte	df39870587	Factor out index decision.	2025-10-24 11:53:55 -04:00
Thomas Harte	e9c8c61dcf	Reformulate to be slightly more conditional, but substantially deduplicate code.	2025-10-23 21:52:31 -04:00
Thomas Harte	79ab1d8cb1	Implement final SHA.	2025-10-23 13:42:23 -04:00
Thomas Harte	7cd20f5d12	Add all absolute-indexed oddities.	2025-10-23 13:39:03 -04:00
Thomas Harte	5396d751e1	Support SHX and a SHA.	2025-10-23 13:27:55 -04:00
Thomas Harte	d23e715650	Decision: these five have weird addressing, so that counts as weird addressing modes.	2025-10-23 13:13:01 -04:00
Thomas Harte	0791bce338	Fix everything other than the oddball SHA/SHX/SHY/SHS.	2025-10-22 22:12:32 -04:00
Thomas Harte	62a8bf4261	Add missing RTS cycle.	2025-10-22 17:56:11 -04:00
Thomas Harte	ebda18b44e	Implement the two JMPs.	2025-10-22 17:52:55 -04:00
Thomas Harte	a8f41b9017	Implement RTI and RTS.	2025-10-22 17:48:19 -04:00
Thomas Harte	410c19a7da	Fix pull.	2025-10-22 17:43:08 -04:00
Thomas Harte	2d114b6677	Implement JSR.	2025-10-22 17:37:01 -04:00
Thomas Harte	02e74ca1f4	Add absolute-indexed addressing.	2025-10-22 17:18:54 -04:00
Thomas Harte	69122cdec4	Swing at zero-indexed addressing.	2025-10-22 17:12:23 -04:00
Thomas Harte	d730168631	Remove dead label.	2025-10-22 13:30:24 -04:00
Thomas Harte	2f210ebe3b	Fix IndexedIndirect/IndirectIndexed confusion, proceed to test 0x14.	2025-10-22 13:29:45 -04:00
Thomas Harte	693b53baa2	Proceed through absolute addressing to test 0x10.	2025-10-22 13:05:46 -04:00
Thomas Harte	45363922b5	Adds rolls and shifts, and zero-page addressing.	2025-10-22 12:56:07 -04:00
Thomas Harte	0463c1ceda	Reduce repetition.	2025-10-21 23:21:11 -04:00
Thomas Harte	b35a55a658	Implement jamming.	2025-10-21 23:16:59 -04:00
Thomas Harte	4da68c9fa8	Implement IndirectIndexedRead.	2025-10-21 23:01:41 -04:00
Thomas Harte	72f133f31b	Do enough work to verify BRK.	2025-10-21 22:07:35 -04:00
Thomas Harte	b5899a2e42	Implement simplest operations.	2025-10-21 17:33:36 -04:00
Thomas Harte	4ee8f8564e	Catch unimplemented.	2025-10-21 13:40:23 -04:00
Thomas Harte	ff08c03bc5	Coral into building.	2025-10-21 13:31:48 -04:00
Thomas Harte	95dd430b0d	Shoehorn in an invocation.	2025-10-21 13:12:58 -04:00
Thomas Harte	20eb8b1442	Move RDY inline.	2025-10-21 12:59:16 -04:00
Thomas Harte	2d6a0b3ed0	Add a branch to nowhere.	2025-10-20 23:08:04 -04:00
Thomas Harte	fde0e2434e	Attempt to transcribe base 6502 instruction set.	2025-10-20 22:50:14 -04:00
Thomas Harte	2cdf6ac8f9	Add interrupt, RDY and instruction fetch logic.	2025-10-20 13:16:03 -04:00
Thomas Harte	309c58a93d	Include in CI builds; start implementation.	2025-10-19 23:29:27 -04:00