737 Commits

Author	SHA1	Message	Date
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