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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Thomas Harte
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fa7c64bb5d
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Eventually reached an implementation of ADC that continues to satisfy all the formalised unit tests while also satisfying the manual BCDTest, that I need to find a way to formalise. I fixed the unit tests for Swift 3 while here, and attempted to do some unrelated NIB stuff with no real success.
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2016-10-03 22:03:39 -04:00 |
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Thomas Harte
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5d40d70c92
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Fixed 6560 addressing error, added an autotyper for Vic disks (more work potentially needed), fixed semantics for testing whether a 6502 is about to reset.
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2016-08-01 10:32:32 -04:00 |
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Thomas Harte
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740ea0b7e2
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Added overflow-flag setting logic and ensured disk ROM gets through regardless of ROM/disk installation order.
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2016-07-31 19:33:18 -04:00 |
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Thomas Harte
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1baf21827c
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Since the ROM is well disassembled, let's actually try to be a 1541 first.
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2016-07-06 22:17:32 -04:00 |
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Thomas Harte
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41809d4597
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Made an attempt at NMI usurption of IRQ/BRK.
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2016-06-29 20:59:45 -04:00 |
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Thomas Harte
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c02226bc41
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Ensured stack pointer goes the right way upon reset.
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2016-06-29 20:42:26 -04:00 |
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Thomas Harte
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db7c6430b5
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Fixed Klaus Dormann termination condition.
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2016-06-29 19:16:34 -04:00 |
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Thomas Harte
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0182b0483a
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Added a 'power on' flag that is set automatically at construction but can be declined. Saves all that stuff of every machine having to set and then unset the RST line, and fixes an Electron bug related to that.
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2016-06-29 19:13:24 -04:00 |
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Thomas Harte
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6419d9c485
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Added a single IRQ test case, discovering that I'm two cycles short. Whoops!
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2016-06-28 21:29:43 -04:00 |
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Thomas Harte
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6e698e908e
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Made an attempt to reduce cost of the most-likely path.
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2016-06-28 18:46:00 -04:00 |
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Thomas Harte
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574aa32b72
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Made an attempt to implement NMI. Some work to do on the B flag though, I think.
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2016-06-27 22:01:48 -04:00 |
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Thomas Harte
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88e2b382e5
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Made an attempt at a full and thorough 6532 implementation (and got a bit more explicit about flag size in the 6502).
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2016-06-20 18:57:35 -04:00 |
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Thomas Harte
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ef3ed1f436
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Implemented full paste ability for any machine that is a typer.
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2016-06-19 16:35:04 -04:00 |
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Thomas Harte
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06fb2ff1c7
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Started endeavouring to sketch out the boilerplate for writing a 6522 test harness. Added a default implementation of synchronise to the 6522 too, since not everybody is going to want one.
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2016-06-18 09:28:46 -04:00 |
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Thomas Harte
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5c4f35e13f
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Finally started on generalising the C++ stuff so as to be able to be able to get a working audio binding on the OS-specific side without further repetition by factoring an appropriate protocol out from the Electron and sketching out the correct speaker class for the Atari. Added a method to ask it what a good output frequency would be.
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2016-05-31 21:23:44 -04:00 |
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Thomas Harte
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0242924fb4
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Various bits of caveman debugging appearing and disappearing, switched to latching ball behaviour.
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2016-05-22 14:26:02 -04:00 |
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Thomas Harte
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e636ae37b4
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Ensured that calling return_from_subroutine really does unjam the processor if required, causing all tests once again to pass.
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2016-05-10 21:44:11 -04:00 |
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Thomas Harte
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5a4262d74e
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Confirmed: it is inaccurate for a 6502 to self reset at power up. So that responsibility now rests in the machines.
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2016-05-10 21:05:52 -04:00 |
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Thomas Harte
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9b64f64db7
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Attempted to normalise some style decisions.`
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2016-04-24 22:32:24 -04:00 |
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Thomas Harte
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a6ef78862c
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This'll probably do for now.
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2016-03-24 22:20:00 -04:00 |
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Thomas Harte
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f1caf62ff2
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Continuing the switch around.
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2016-03-24 19:31:41 -04:00 |
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Thomas Harte
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738186e323
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Edging back towards shifting things to the stack.
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2016-03-24 19:17:44 -04:00 |
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Thomas Harte
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3038704977
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Attempted to introduce a lowpass filter to the graphics output, reverted 6502 optimisations as seemingly not working.
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2016-03-21 22:01:25 -04:00 |
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Thomas Harte
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5db0f9e2d5
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Shunted a few more things onto the stack.
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2016-03-20 22:59:21 -04:00 |
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Thomas Harte
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9a82f028aa
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operation is now also stack local.
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2016-03-20 22:52:49 -04:00 |
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Thomas Harte
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2f174b3a3e
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Moved operand to stack-local storage.
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2016-03-20 22:50:16 -04:00 |
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Thomas Harte
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5966ac845f
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Switched symbols and updated all-RAM 6502 in order to fix unit test target.
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2016-03-20 22:48:56 -04:00 |
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Thomas Harte
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a4ec0b023c
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Made some type conversions explicit.
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2016-03-15 21:25:02 -04:00 |
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Thomas Harte
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20ac630e4d
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Some minor optimisations and timing tweaks. Nothing of substance.
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2016-03-10 19:58:50 -05:00 |
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Thomas Harte
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1eea28b692
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Disabled some debugging parts, added some others, marked some things as inline. Ticking over.
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2016-02-22 23:35:42 -05:00 |
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Thomas Harte
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baef1ccd57
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Made the constructor protected, to emphasise that this class isn't for instantiation. Also added extra comments aplenty.
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2016-01-21 08:39:34 -05:00 |
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Thomas Harte
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9fa35dd559
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Killed some whitespace lines.
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2016-01-20 21:58:34 -05:00 |
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Thomas Harte
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de7218cdf0
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Added a lot of commenting to the CPU6502 definition, simplifying its construction. Added missing nullability modifier to CSElectron. Fixed bad-habit Objective-C style naming on the Electron's Interrupt enum.
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2016-01-20 21:55:38 -05:00 |
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