Thomas Harte
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78296246e8
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Added ALU n.
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2017-05-21 09:46:18 -04:00 |
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Thomas Harte
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85b5dd35b1
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Took a shot at 8-bit arithmetic.
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2017-05-21 09:43:17 -04:00 |
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Thomas Harte
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11cfaa3e3d
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Performed light syntactic cleaning on the first part of the base page table, eliminated redundant temporary variables, implemented 8-bit increment and decrement.
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2017-05-21 09:17:30 -04:00 |
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Thomas Harte
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103c863534
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Through temporarily dramatically increased logging, fixed conditional JP.
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2017-05-20 23:03:52 -04:00 |
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Thomas Harte
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6688f83226
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Took a shot at LDIR.
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2017-05-20 21:58:24 -04:00 |
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Thomas Harte
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01a064dd63
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Added an empty ED page.
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2017-05-20 17:29:30 -04:00 |
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Thomas Harte
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7b234078ae
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Implemented EX DE, HL and shuffled to allow instruction pages.
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2017-05-20 17:04:25 -04:00 |
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Thomas Harte
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add02a7897
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Added LD (nn), A, and reduced double logging to single for now.
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2017-05-19 23:13:28 -04:00 |
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Thomas Harte
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19167df692
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Consolidated and filled in AND and XOR.
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2017-05-19 23:03:34 -04:00 |
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Thomas Harte
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6766845e21
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Filled in most of the loads.
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2017-05-19 22:57:43 -04:00 |
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Thomas Harte
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bc3b5f3e35
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Added 16-bit INCs and DECs. Which don't set flags, so are easy.
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2017-05-19 22:13:36 -04:00 |
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Thomas Harte
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5fe23113ec
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Moved RET to the correct place, implemented POP AF.
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2017-05-19 22:03:12 -04:00 |
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Thomas Harte
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c55e1c1d17
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Implemented POP and therefore RET; corrected timing of PUSH.
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2017-05-19 21:59:45 -04:00 |
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Thomas Harte
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d910405648
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Added enough infrastructure to be able to react to the two CP/M calls this cares about.
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2017-05-19 21:53:39 -04:00 |
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Thomas Harte
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62b432c046
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Added the concept of a trap handler to the all-RAM processor and exposed it via the test Z80 classes.
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2017-05-19 21:20:28 -04:00 |
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Thomas Harte
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eae1f78221
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Implemented the main page pushes.
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2017-05-19 19:28:38 -04:00 |
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Thomas Harte
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11d05fb3b8
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Expanded a little on operations, added an implementation or two.
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2017-05-19 19:18:35 -04:00 |
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Thomas Harte
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58efca835f
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Sought to add a further opcode.
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2017-05-18 22:53:43 -04:00 |
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Thomas Harte
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99f2060fc1
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Further improved macros.
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2017-05-18 22:11:54 -04:00 |
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Thomas Harte
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5d3ebcb35a
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Made a first attempt at LD HL, (nn).
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2017-05-17 22:42:30 -04:00 |
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Thomas Harte
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509d011fbe
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Implemented JP, my first Z80 operation.
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2017-05-17 22:31:41 -04:00 |
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Thomas Harte
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17ffd604bf
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Made an attempt to get the Z80 at least as far as rejecting an opcode.
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2017-05-17 21:45:23 -04:00 |
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Thomas Harte
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21d0602305
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Restored the all RAM 6502's lack of power-on reset.
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2017-05-17 21:43:40 -04:00 |
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Thomas Harte
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1378ab7278
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Ensured initial program counter and stack pointer are correct for Zexall, fixed the Z80 to use a compile-time polymorphic call for bus access.
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2017-05-17 07:36:06 -04:00 |
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Thomas Harte
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87a021ec2d
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Made further attempt to get as fas as having the Z80 attempt to do something.
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2017-05-16 22:19:40 -04:00 |
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Thomas Harte
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7190f927b7
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Factored out the stuff that both all-RAM processors would share, rather than duplicating it.
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2017-05-16 21:28:17 -04:00 |
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Thomas Harte
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d559d8b901
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Continued edging towards getting the absolute basics of a testable Z80, for test-driven development. Corrected old-fashioned instance naming issues with the corresponding 6502 class and removed an unnecessary source file while at it.
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2017-05-16 21:19:17 -04:00 |
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Thomas Harte
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50bb4f0142
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There's finally a loop in here, at least.
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2017-05-15 22:25:52 -04:00 |
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Thomas Harte
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7da51602d5
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Moved flush, added run_for_cycles, which does nothing right now.
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2017-05-15 07:59:21 -04:00 |
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Thomas Harte
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5152517887
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Added the boilerplate stuff necessary to query registers.
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2017-05-15 07:55:53 -04:00 |
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Thomas Harte
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eb8a2de5d6
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Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80.
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2017-05-15 07:38:59 -04:00 |
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Thomas Harte
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f2a1a906ff
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Adapted what negligible amount there is of the z80 as per the new CPU namespace.
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2017-05-14 22:15:16 -04:00 |
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Thomas Harte
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0808e9b6fb
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Pulled the 6502 into a CPU namespace, making it an instance of something that has micro-opcodes and schedules them, and factoring out the formulation of a register pair.
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2017-05-14 22:08:15 -04:00 |
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Thomas Harte
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b81a2cc273
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First tentative steps towards adding a Z80 implementation.
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2017-05-14 17:46:41 -04:00 |
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Thomas Harte
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defec2c9b0
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Fixed: operation reads now fulfil the promise of seeding the value to be read with 0xff.
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2017-03-26 20:56:27 -04:00 |
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Thomas Harte
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e01f3f06c8
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Completed curly bracket movement.
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2017-03-26 14:34:47 -04:00 |
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Thomas Harte
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55ce851bb2
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Fixed types of the 8k cartridges, ensured the 6502 starts without an IRQ request history.
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2017-03-18 17:04:01 -04:00 |
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Thomas Harte
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36b58d03b7
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Formalised read bus value guarantee from the 6502, fixed missing clock signal wiring on the Atari cartridge class, reintroduced CommaVid support.
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2017-03-18 14:46:46 -04:00 |
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Thomas Harte
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14a76af0d3
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Started trying to float out bus control to cartridges.
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2017-03-17 20:28:07 -04:00 |
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Thomas Harte
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5be22e2f8d
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Switched to suffix underscores and underscores in general for instance variables.
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2016-12-03 11:38:53 -05:00 |
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Thomas Harte
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7ad44f5152
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Flipped order of conditional so as negligibly to improve prediction.
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2016-10-31 22:17:18 -04:00 |
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Thomas Harte
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2452a3104f
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Corrected test: hitting zero is sufficient. No need to cross it.
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2016-10-30 20:24:30 -04:00 |
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Thomas Harte
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9309be229c
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Moved cycle count test down to the only places where it may actually yield a different result.
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2016-10-30 20:13:44 -04:00 |
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Thomas Harte
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a106018680
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Fixed initial state: interrupt flag is initially low.
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2016-10-28 21:22:03 -04:00 |
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Thomas Harte
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613b5b3f98
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Switched to inverse storage of the interrupt flag so as to reduce logical burden when storing IRQ line history.
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2016-10-28 20:52:43 -04:00 |
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Thomas Harte
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4408c60ef7
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This too should continue, not break, since it doesn't schedule a memory access.
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2016-10-27 18:32:21 -04:00 |
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Thomas Harte
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534b3d085d
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Improved test reporting, attempted to resolve timing errors just introduced (i.e. to differentiate break/continue where a cycle may or may not be spent).
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2016-10-27 08:41:44 -04:00 |
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Thomas Harte
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f84b66a5f4
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Made an attempt to fix wake-from-WAIT.
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2016-10-25 19:06:46 -04:00 |
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Thomas Harte
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4b18c76b84
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Introduced a bifurcation between break and continue to signify whether a bus access takes place, necessitating a shift in the location of the bus access but allowing the conditional to be dropped. Need to test.
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2016-10-25 18:45:53 -04:00 |
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Thomas Harte
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c253a4258f
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Made minor restructuring changes, slightly to reduce number of conditionals per operation and to drop a big hint to the optimiser.
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2016-10-25 18:34:24 -04:00 |
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