Thomas Harte
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ca9e8aecd6
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Made a seemingly unsuccessful attempt to add tape input.
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2017-06-06 10:13:32 -04:00 |
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Thomas Harte
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cc4cb45e9d
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Implemented keyboard input and ensured that the signal generated is marked as composite, putting the colour-suppression ball into the CRT's court.
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2017-06-06 09:25:18 -04:00 |
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Thomas Harte
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ebbf6e6133
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Surprisingly, I think this may actually be the correct output: stopped throwing away the I part of the refresh register and flipped black and white.
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2017-06-06 09:03:09 -04:00 |
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Thomas Harte
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cba07dec7e
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Doubled up to display all eight pixels. To confirm that they are the wrong pixels.
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2017-06-06 08:59:00 -04:00 |
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Thomas Harte
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6f7037b2b1
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Made an initial stab at outputting half the correct pixels.
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2017-06-06 08:55:07 -04:00 |
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Thomas Harte
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ef4b2f963d
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Probably more-or-less corrected. But this is all a bit too interdependent.
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2017-06-05 23:52:56 -04:00 |
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Thomas Harte
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97f3ff03b6
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Restored white background and attempted to correct output timing deficiencies. Incomplete success.
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2017-06-05 23:50:04 -04:00 |
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Thomas Harte
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2fbc7a2869
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Made a very basic attempt at getting something that at least demarcates proper graphics output.
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2017-06-05 23:32:49 -04:00 |
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Thomas Harte
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4983718df7
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Got to outputting something to the CRT. Should be just proper syncs and a paper background. It's not synchronising properly, so something is amiss in my timing.
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2017-06-05 10:47:42 -04:00 |
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Thomas Harte
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23ca00fd9a
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Added memory fuzzing as a way to verify state being written by the Z80. Eventually discovered the HALT problem as fixed in the last commit, so have stripped away the caveman stuff again.
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2017-06-05 10:36:07 -04:00 |
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Thomas Harte
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893f61b490
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Attempted specifically to reproduce the 1kb ZX80 memory map in the hope of getting compact lines and in case mirroring is why I'm getting completely empty video reads. Still no action.
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2017-06-05 09:38:49 -04:00 |
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Thomas Harte
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7e3a46c33e
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[Re]discovered that sync may also be a product of the interrupt cycle. So started looking into that.
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2017-06-04 21:54:55 -04:00 |
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Thomas Harte
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73654d51dd
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Wired up actually to run.
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2017-06-04 18:37:13 -04:00 |
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Thomas Harte
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096551ab3e
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Made a first attempt to hash out the ZX80's bus. Video output isn't yet going though. Can't seem to find clarity on whether horizontal sync is really programmatic. Let's see.
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2017-06-04 18:32:23 -04:00 |
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Thomas Harte
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c485c460f7
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Imported the ZX80 and 81 system ROMs (though not publicly), added enough code to post their contents into C++ world.
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2017-06-04 18:08:35 -04:00 |
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Thomas Harte
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d2637123c4
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Added necessary support to get as far as an empty window when attempting to load a piece of ZX80 software.
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2017-06-04 17:55:19 -04:00 |
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Thomas Harte
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2562306802
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Merge branch 'master' into Z80
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2017-05-16 21:05:00 -04:00 |
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Thomas Harte
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2ee8a7056e
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Corrected TIA no longer to assume phase is an automatic quarter askew.
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2017-05-16 20:43:28 -04:00 |
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Thomas Harte
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a5075d9eb5
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Formalised the reasoning behind the colour phase fix-up and made it an opt-in per-caller value. Only the Oric currently needs to opt in.
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2017-05-16 20:31:39 -04:00 |
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Thomas Harte
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eb8a2de5d6
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Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80.
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2017-05-15 07:38:59 -04:00 |
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Thomas Harte
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0808e9b6fb
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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.
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2017-05-14 22:08:15 -04:00 |
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Thomas Harte
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8e35e913bb
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Formally withdrew the 'load automatically' option for the Vic, having removed that option elsewhere.
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2017-05-14 16:59:24 -04:00 |
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Thomas Harte
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5d91a2600d
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Permitted ROM-style PRGs that are not a power-of-two in size, and added extra safety checks on loading data from a tape.
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2017-05-08 22:15:35 -04:00 |
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Thomas Harte
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cb66c7e2dc
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Performed some minor tidying.
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2017-05-08 21:05:35 -04:00 |
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Thomas Harte
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61f8f2f18c
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Switched to a more straightforward way of exiting from tape data loading.
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2017-05-08 20:58:55 -04:00 |
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Thomas Harte
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7b43ae0a92
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Implemented a catch for loading the data portion of files.
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2017-05-07 22:22:59 -04:00 |
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Thomas Harte
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2807e3134f
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Implemented speedy header finding. So that's half of it.
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2017-05-07 20:32:48 -04:00 |
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Thomas Harte
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0771363f3b
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Removed one piece of unnecessary logging.
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2017-05-06 22:22:03 -04:00 |
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Thomas Harte
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2edf73908c
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Temporarily disabled the existing fast loading implementation in pursuit of another, and started trying to correct the lack of connection between the userport VIA and the tape drive.
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2017-05-06 22:00:12 -04:00 |
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Thomas Harte
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ed6b135015
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Made final switch to permit high-sampling rate Atari audio.
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2017-04-15 21:18:00 -04:00 |
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Thomas Harte
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f95015c7f6
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Pulled out the divisor for audio.
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2017-04-03 21:16:39 -04:00 |
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Thomas Harte
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814c0ada13
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Fixed action counts for border motion.
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2017-03-26 18:33:05 -04:00 |
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Thomas Harte
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dfc468f220
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Locked down all initial state.
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2017-03-26 15:47:04 -04:00 |
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Thomas Harte
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e01f3f06c8
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Completed curly bracket movement.
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2017-03-26 14:34:47 -04:00 |
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Thomas Harte
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3229502fa1
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Standardised curly bracket placement across the Atari.
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2017-03-23 21:59:16 -04:00 |
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Thomas Harte
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a26b87f348
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Fixed: mistake was failure to count ready cycles.
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2017-03-20 20:44:03 -04:00 |
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Thomas Harte
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4c3cc42c91
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This gives a very noisy version of the real audio.
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2017-03-20 20:38:29 -04:00 |
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Thomas Harte
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f3f4e1a541
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Made a first, hacky, attempt at audio.
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2017-03-20 19:35:51 -04:00 |
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Thomas Harte
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4722f6b5c4
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Fixed sprite disappearance: test should be applied predecrement, not post — it relates to the address being used this access, not the next one.
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2017-03-19 18:58:35 -04:00 |
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Thomas Harte
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7d8d1c7828
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Fixed 'random' number generator.
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2017-03-19 18:54:35 -04:00 |
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Thomas Harte
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4bb70e7d31
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Resetting the mask upon low byte write appears to resolve some issues.
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2017-03-19 18:49:37 -04:00 |
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Thomas Harte
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321030bb44
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Added a slightly faulty but seemingly 'close' version of masking.
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2017-03-19 18:28:06 -04:00 |
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Thomas Harte
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6c161b1150
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This gives something that might be the correct background.
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2017-03-19 17:49:48 -04:00 |
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Thomas Harte
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d5c37c8619
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Shushed a little, so as to be able to see a reasonable amount of output during my lifetime.
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2017-03-19 17:38:54 -04:00 |
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Thomas Harte
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7c66c36d3f
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Attempted at least to manage appropriate data storage.
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2017-03-19 17:31:08 -04:00 |
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Thomas Harte
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031a68000a
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Added a class to contain the Pitfall 2 pager and a skeleton of initial work.
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2017-03-18 22:08:47 -04:00 |
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Thomas Harte
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c3d82f88a5
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Tidied up and commented on the Activision stack implementation.
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2017-03-18 21:01:58 -04:00 |
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Thomas Harte
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c033bad0b9
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Here's MNetwork!
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2017-03-18 20:51:49 -04:00 |
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Thomas Harte
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c31d85f820
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Re-emplaced the MegaBoy. Also cut detritus from the main Atari header.
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2017-03-18 19:02:34 -04:00 |
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Thomas Harte
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217fbf257e
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CBS RAM Plus returns.
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2017-03-18 18:56:20 -04:00 |
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