450 Commits

Author	SHA1	Message	Date
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
Thomas Harte	2f174b3a3e	Moved operand to stack-local storage.	2016-03-20 22:50:16 -04:00
Thomas Harte	5966ac845f	Switched symbols and updated all-RAM 6502 in order to fix unit test target.	2016-03-20 22:48:56 -04:00
Thomas Harte	a4ec0b023c	Made some type conversions explicit.	2016-03-15 21:25:02 -04:00
Thomas Harte	20ac630e4d	Some minor optimisations and timing tweaks. Nothing of substance.	2016-03-10 19:58:50 -05:00
Thomas Harte	1eea28b692	Disabled some debugging parts, added some others, marked some things as inline. Ticking over.	2016-02-22 23:35:42 -05:00
Thomas Harte	baef1ccd57	Made the constructor protected, to emphasise that this class isn't for instantiation. Also added extra comments aplenty.	2016-01-21 08:39:34 -05:00
Thomas Harte	9fa35dd559	Killed some whitespace lines.	2016-01-20 21:58:34 -05:00
Thomas Harte	de7218cdf0	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.	2016-01-20 21:55:38 -05:00
Thomas Harte	93f7df04a0	Ensured correctly timed sampling of the interrupt line.	2016-01-10 22:55:56 -05:00
Thomas Harte	ccf20299a3	Made an attempt at getting some interrupts all up inside this thing.	2016-01-10 19:06:46 -05:00
Thomas Harte	7341f5c341	This is intended to be enough to start producing something of an output. But something's obviously still broken.	2016-01-09 20:26:40 -05:00
Thomas Harte	bfd9957c81	You now get an Electron only if you ask for a new file. That'll do for now while it's the only thing that one might want to start without supplying a file. The 6502 now starts from a defined point — being reset. The Electron is starting to grow the absolute most simple buds of its memory map.	2016-01-06 21:09:49 -05:00
Thomas Harte	675070c5dd	Very, _very_ minor: switched to normal C++ constructor syntax for simple variable initialisation.	2015-12-06 16:53:37 -05:00
Thomas Harte	a693c081f8	Switched on the appropriate compiler warnings re: signed comparisons and implicit conversions. Fixed all less-than-explicit calls.	2015-08-16 16:08:29 -04:00
Thomas Harte	9ca57b80a7	Minor steps to help with diagnostics; all commented out or merely to benefit with breakpoint placement.	2015-08-13 08:43:10 +01:00
Thomas Harte	cc98534f94	Added test for NOP, discovering the undocumented ones to be the incorrect length.	2015-08-13 07:32:50 +01:00
Thomas Harte	dd0f17130a	Found and fixed some timing errors in absolute indexed and in (indirect), y addressing modes: neither is able in write or read-modify-write modes to shave a cycle as then can when reading.	2015-08-13 02:58:39 +01:00
Thomas Harte	975836c30f	Added a quick snippet test, discovering that I've cut a cycle from read/modify/writes.	2015-08-13 02:18:41 +01:00
Thomas Harte	503d684af0	Added a couple of timing tests, both of which seem to pass for now.	2015-08-13 01:55:23 +01:00
Thomas Harte	d19f8ed507	Removed the implicit reset upon 6502 startup, adding a reset line. Hence all tests now pass again. Added an empty shell for timing tests, the all-RAM 6502 now counting bus cycles.	2015-08-13 00:51:06 +01:00
Thomas Harte	c1d1fb65cb	Made an attempt properly to emulate the RDY line and the Atari's use of it.	2015-07-31 16:54:20 -04:00
Thomas Harte	53dd5c8f16	Trying to fix my RDY line emulation. Switched to PAL timings, at least temporarily, since it's starting to make a difference.	2015-07-31 16:44:53 -04:00
Thomas Harte	cd0a62d21e	With a slight tweak to the informal protocol used for 6502 memory access cycles, ensured the wait strobe actually halts the CPU, to give a more accurate linking of machine time to real time.	2015-07-26 15:55:19 -04:00
Thomas Harte	6252f6030f	Switched to idiomatic source name, ensured latest project name is in all appropriate header places, threw texture coordinates slightly into the shader mix.	2015-07-26 15:25:11 -04:00
Thomas Harte	6558ae1425	Imported what little I have so far in the way of a memory-access cycle complete 6502 and just enough of a pretend Atari 2600 on top to be able to see some playfields in ASCII art.	2015-07-16 19:56:02 -04:00