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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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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