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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Thomas Harte
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93f7df04a0
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Ensured correctly timed sampling of the interrupt line.
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2016-01-10 22:55:56 -05:00 |
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Thomas Harte
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ccf20299a3
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Made an attempt at getting some interrupts all up inside this thing.
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2016-01-10 19:06:46 -05:00 |
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Thomas Harte
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7341f5c341
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This is intended to be enough to start producing something of an output. But something's obviously still broken.
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2016-01-09 20:26:40 -05:00 |
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Thomas Harte
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bfd9957c81
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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.
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2016-01-06 21:09:49 -05:00 |
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Thomas Harte
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675070c5dd
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Very, _very_ minor: switched to normal C++ constructor syntax for simple variable initialisation.
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2015-12-06 16:53:37 -05:00 |
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Thomas Harte
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a693c081f8
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Switched on the appropriate compiler warnings re: signed comparisons and implicit conversions. Fixed all less-than-explicit calls.
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2015-08-16 16:08:29 -04:00 |
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Thomas Harte
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9ca57b80a7
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Minor steps to help with diagnostics; all commented out or merely to benefit with breakpoint placement.
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2015-08-13 08:43:10 +01:00 |
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Thomas Harte
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cc98534f94
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Added test for NOP, discovering the undocumented ones to be the incorrect length.
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2015-08-13 07:32:50 +01:00 |
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Thomas Harte
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dd0f17130a
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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.
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2015-08-13 02:58:39 +01:00 |
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Thomas Harte
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975836c30f
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Added a quick snippet test, discovering that I've cut a cycle from read/modify/writes.
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2015-08-13 02:18:41 +01:00 |
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Thomas Harte
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503d684af0
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Added a couple of timing tests, both of which seem to pass for now.
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2015-08-13 01:55:23 +01:00 |
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Thomas Harte
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d19f8ed507
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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.
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2015-08-13 00:51:06 +01:00 |
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Thomas Harte
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c1d1fb65cb
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Made an attempt properly to emulate the RDY line and the Atari's use of it.
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2015-07-31 16:54:20 -04:00 |
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Thomas Harte
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53dd5c8f16
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Trying to fix my RDY line emulation. Switched to PAL timings, at least temporarily, since it's starting to make a difference.
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2015-07-31 16:44:53 -04:00 |
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Thomas Harte
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cd0a62d21e
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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.
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2015-07-26 15:55:19 -04:00 |
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Thomas Harte
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6252f6030f
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Switched to idiomatic source name, ensured latest project name is in all appropriate header places, threw texture coordinates slightly into the shader mix.
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2015-07-26 15:25:11 -04:00 |
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Thomas Harte
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6558ae1425
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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.
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2015-07-16 19:56:02 -04:00 |
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