75 Commits

Author	SHA1	Message	Date
Thomas Harte	7190f927b7	Factored out the stuff that both all-RAM processors would share, rather than duplicating it.	2017-05-16 21:28:17 -04:00
Thomas Harte	d559d8b901	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.	2017-05-16 21:19:17 -04:00
Thomas Harte	50bb4f0142	There's finally a loop in here, at least.	2017-05-15 22:25:52 -04:00
Thomas Harte	7da51602d5	Moved flush, added run_for_cycles, which does nothing right now.	2017-05-15 07:59:21 -04:00
Thomas Harte	5152517887	Added the boilerplate stuff necessary to query registers.	2017-05-15 07:55:53 -04:00
Thomas Harte	eb8a2de5d6	Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80.	2017-05-15 07:38:59 -04:00
Thomas Harte	f2a1a906ff	Adapted what negligible amount there is of the z80 as per the new CPU namespace.	2017-05-14 22:15:16 -04:00
Thomas Harte	0808e9b6fb	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.	2017-05-14 22:08:15 -04:00
Thomas Harte	b81a2cc273	First tentative steps towards adding a Z80 implementation.	2017-05-14 17:46:41 -04:00
Thomas Harte	defec2c9b0	Fixed: operation reads now fulfil the promise of seeding the value to be read with 0xff.	2017-03-26 20:56:27 -04:00
Thomas Harte	e01f3f06c8	Completed curly bracket movement.	2017-03-26 14:34:47 -04:00
Thomas Harte	55ce851bb2	Fixed types of the 8k cartridges, ensured the 6502 starts without an IRQ request history.	2017-03-18 17:04:01 -04:00
Thomas Harte	36b58d03b7	Formalised read bus value guarantee from the 6502, fixed missing clock signal wiring on the Atari cartridge class, reintroduced CommaVid support.	2017-03-18 14:46:46 -04:00
Thomas Harte	14a76af0d3	Started trying to float out bus control to cartridges.	2017-03-17 20:28:07 -04:00
Thomas Harte	5be22e2f8d	Switched to suffix underscores and underscores in general for instance variables.	2016-12-03 11:38:53 -05:00
Thomas Harte	7ad44f5152	Flipped order of conditional so as negligibly to improve prediction.	2016-10-31 22:17:18 -04:00
Thomas Harte	2452a3104f	Corrected test: hitting zero is sufficient. No need to cross it.	2016-10-30 20:24:30 -04:00
Thomas Harte	9309be229c	Moved cycle count test down to the only places where it may actually yield a different result.	2016-10-30 20:13:44 -04:00
Thomas Harte	a106018680	Fixed initial state: interrupt flag is initially low.	2016-10-28 21:22:03 -04:00
Thomas Harte	613b5b3f98	Switched to inverse storage of the interrupt flag so as to reduce logical burden when storing IRQ line history.	2016-10-28 20:52:43 -04:00
Thomas Harte	4408c60ef7	This too should continue, not break, since it doesn't schedule a memory access.	2016-10-27 18:32:21 -04:00
Thomas Harte	534b3d085d	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).	2016-10-27 08:41:44 -04:00
Thomas Harte	f84b66a5f4	Made an attempt to fix wake-from-WAIT.	2016-10-25 19:06:46 -04:00
Thomas Harte	4b18c76b84	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.	2016-10-25 18:45:53 -04:00
Thomas Harte	c253a4258f	Made minor restructuring changes, slightly to reduce number of conditionals per operation and to drop a big hint to the optimiser.	2016-10-25 18:34:24 -04:00
Thomas Harte	fa7c64bb5d	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.	2016-10-03 22:03:39 -04:00
Thomas Harte	5d40d70c92	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.	2016-08-01 10:32:32 -04:00
Thomas Harte	740ea0b7e2	Added overflow-flag setting logic and ensured disk ROM gets through regardless of ROM/disk installation order.	2016-07-31 19:33:18 -04:00
Thomas Harte	1baf21827c	Since the ROM is well disassembled, let's actually try to be a 1541 first.	2016-07-06 22:17:32 -04:00
Thomas Harte	41809d4597	Made an attempt at NMI usurption of IRQ/BRK.	2016-06-29 20:59:45 -04:00
Thomas Harte	c02226bc41	Ensured stack pointer goes the right way upon reset.	2016-06-29 20:42:26 -04:00
Thomas Harte	db7c6430b5	Fixed Klaus Dormann termination condition.	2016-06-29 19:16:34 -04:00
Thomas Harte	0182b0483a	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.	2016-06-29 19:13:24 -04:00
Thomas Harte	6419d9c485	Added a single IRQ test case, discovering that I'm two cycles short. Whoops!	2016-06-28 21:29:43 -04:00
Thomas Harte	6e698e908e	Made an attempt to reduce cost of the most-likely path.	2016-06-28 18:46:00 -04:00
Thomas Harte	574aa32b72	Made an attempt to implement NMI. Some work to do on the B flag though, I think.	2016-06-27 22:01:48 -04:00
Thomas Harte	88e2b382e5	Made an attempt at a full and thorough 6532 implementation (and got a bit more explicit about flag size in the 6502).	2016-06-20 18:57:35 -04:00
Thomas Harte	ef3ed1f436	Implemented full paste ability for any machine that is a typer.	2016-06-19 16:35:04 -04:00
Thomas Harte	06fb2ff1c7	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.	2016-06-18 09:28:46 -04:00
Thomas Harte	5c4f35e13f	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.	2016-05-31 21:23:44 -04:00
Thomas Harte	0242924fb4	Various bits of caveman debugging appearing and disappearing, switched to latching ball behaviour.	2016-05-22 14:26:02 -04:00
Thomas Harte	e636ae37b4	Ensured that calling return_from_subroutine really does unjam the processor if required, causing all tests once again to pass.	2016-05-10 21:44:11 -04:00
Thomas Harte	5a4262d74e	Confirmed: it is inaccurate for a 6502 to self reset at power up. So that responsibility now rests in the machines.	2016-05-10 21:05:52 -04:00
Thomas Harte	9b64f64db7	Attempted to normalise some style decisions.`	2016-04-24 22:32:24 -04:00
Thomas Harte	a6ef78862c	This'll probably do for now.	2016-03-24 22:20:00 -04:00
Thomas Harte	f1caf62ff2	Continuing the switch around.	2016-03-24 19:31:41 -04:00
Thomas Harte	738186e323	Edging back towards shifting things to the stack.	2016-03-24 19:17:44 -04:00
Thomas Harte	3038704977	Attempted to introduce a lowpass filter to the graphics output, reverted 6502 optimisations as seemingly not working.	2016-03-21 22:01:25 -04:00
Thomas Harte	5db0f9e2d5	Shunted a few more things onto the stack.	2016-03-20 22:59:21 -04:00
Thomas Harte	9a82f028aa	operation is now also stack local.	2016-03-20 22:52:49 -04:00