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886 Commits

Author SHA1 Message Date
Thomas Harte
8b09b4180b This now at least remembers whether it is meant to be a ZX81 and has storage for a horizontal counter. 2017-06-12 21:33:16 -04:00
Thomas Harte
b9dbb6bcf8 Discovered my timing error: the I/R <-> A loads should take an extra cycle. This means the ZX80 now finally takes the correct 207 cycles per line. Fixed the video output wave to be clocked at the appropriate rate. 2017-06-12 18:55:04 -04:00
Thomas Harte
302c2e94de Corrected lingering hard-coded mask. So titles for memory configurations above 1kb now load. 2017-06-11 21:27:46 -04:00
Thomas Harte
06fe07932a While tidying up, killed an unused instance variable. 2017-06-11 21:21:26 -04:00
Thomas Harte
6913c7a018 This also can just use rom_mask_. 2017-06-11 19:29:20 -04:00
Thomas Harte
6b602c74b7 Made an attempt to support memory maps other than the unexpanded default of 1kb. 2017-06-11 19:29:02 -04:00
Thomas Harte
e40d553045 Bumped the tape parser up into the machine to ensure a maintained state. Temporarily disabled normally-timed tape playback. 2017-06-11 18:31:43 -04:00
Thomas Harte
e5b30cdfbb Attempted to ensure appropriate resumption of processing after quick-reading a tape byte. 2017-06-11 17:28:47 -04:00
Thomas Harte
ba5f34f827 Narrowed view to the centre 80% of a frame. 2017-06-11 17:24:32 -04:00
Thomas Harte
84d2feb2e6 Cleaned up and implemented fast-tape hack. I've decided it'd be better to test some other software, potentially to give multiple issues to think about, rather than sitting around with just the one. 2017-06-11 16:42:49 -04:00
Thomas Harte
d910a4fd38 Adjusted to signal an interrupt during the refresh cycle rather than weirdly just afterwards. Which cuts video timing down by 4 cycles a line. There still might be a problem here somewhere though, as I'm getting 206 cycles/line and the internet states it should be 207. 
Also: lots of printfs have grown temporarily as I try to figure out what I'm doing so wrong as to break loading.
 2017-06-11 13:32:20 -04:00
Thomas Harte
5626d35bc4 Tried flipping the bit meaning; decided at least to leave it in full-byte form. 2017-06-06 18:38:05 -04:00
Thomas Harte
63e0802f4e Ensured tape input appears on the returned value. 2017-06-06 18:16:27 -04:00
Thomas Harte
e3ee9604a5 Added comments. 2017-06-06 18:01:33 -04:00
Thomas Harte
8c66e1d99d Factored out ZX80/81 video and rejigged to ensure it will keep ticking over irrespective of whether the machine is supplying data. 2017-06-06 17:53:23 -04:00
Thomas Harte
ca9e8aecd6 Made a seemingly unsuccessful attempt to add tape input. 2017-06-06 10:13:32 -04:00
Thomas Harte
cc4cb45e9d Implemented keyboard input and ensured that the signal generated is marked as composite, putting the colour-suppression ball into the CRT's court. 2017-06-06 09:25:18 -04:00
Thomas Harte
ebbf6e6133 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. 2017-06-06 09:03:09 -04:00
Thomas Harte
cba07dec7e Doubled up to display all eight pixels. To confirm that they are the wrong pixels. 2017-06-06 08:59:00 -04:00
Thomas Harte
6f7037b2b1 Made an initial stab at outputting half the correct pixels. 2017-06-06 08:55:07 -04:00
Thomas Harte
ef4b2f963d Probably more-or-less corrected. But this is all a bit too interdependent. 2017-06-05 23:52:56 -04:00
Thomas Harte
97f3ff03b6 Restored white background and attempted to correct output timing deficiencies. Incomplete success. 2017-06-05 23:50:04 -04:00
Thomas Harte
2fbc7a2869 Made a very basic attempt at getting something that at least demarcates proper graphics output. 2017-06-05 23:32:49 -04:00
Thomas Harte
4983718df7 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. 2017-06-05 10:47:42 -04:00
Thomas Harte
23ca00fd9a 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. 2017-06-05 10:36:07 -04:00
Thomas Harte
893f61b490 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. 2017-06-05 09:38:49 -04:00
Thomas Harte
7e3a46c33e [Re]discovered that sync may also be a product of the interrupt cycle. So started looking into that. 2017-06-04 21:54:55 -04:00
Thomas Harte
73654d51dd Wired up actually to run. 2017-06-04 18:37:13 -04:00
Thomas Harte
096551ab3e 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. 2017-06-04 18:32:23 -04:00
Thomas Harte
c485c460f7 Imported the ZX80 and 81 system ROMs (though not publicly), added enough code to post their contents into C++ world. 2017-06-04 18:08:35 -04:00
Thomas Harte
d2637123c4 Added necessary support to get as far as an empty window when attempting to load a piece of ZX80 software. 2017-06-04 17:55:19 -04:00
Thomas Harte
2562306802 Merge branch 'master' into Z80 2017-05-16 21:05:00 -04:00
Thomas Harte
2ee8a7056e Corrected TIA no longer to assume phase is an automatic quarter askew. 2017-05-16 20:43:28 -04:00
Thomas Harte
a5075d9eb5 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. 2017-05-16 20:31:39 -04:00
Thomas Harte
eb8a2de5d6 Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80. 2017-05-15 07:38:59 -04:00
Thomas Harte
0808e9b6fb 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. 2017-05-14 22:08:15 -04:00
Thomas Harte
8e35e913bb Formally withdrew the 'load automatically' option for the Vic, having removed that option elsewhere. 2017-05-14 16:59:24 -04:00
Thomas Harte
5d91a2600d Permitted ROM-style PRGs that are not a power-of-two in size, and added extra safety checks on loading data from a tape. 2017-05-08 22:15:35 -04:00
Thomas Harte
cb66c7e2dc Performed some minor tidying. 2017-05-08 21:05:35 -04:00
Thomas Harte
61f8f2f18c Switched to a more straightforward way of exiting from tape data loading. 2017-05-08 20:58:55 -04:00
Thomas Harte
7b43ae0a92 Implemented a catch for loading the data portion of files. 2017-05-07 22:22:59 -04:00
Thomas Harte
2807e3134f Implemented speedy header finding. So that's half of it. 2017-05-07 20:32:48 -04:00
Thomas Harte
0771363f3b Removed one piece of unnecessary logging. 2017-05-06 22:22:03 -04:00
Thomas Harte
2edf73908c 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. 2017-05-06 22:00:12 -04:00
Thomas Harte
ed6b135015 Made final switch to permit high-sampling rate Atari audio. 2017-04-15 21:18:00 -04:00
Thomas Harte
f95015c7f6 Pulled out the divisor for audio. 2017-04-03 21:16:39 -04:00
Thomas Harte
814c0ada13 Fixed action counts for border motion. 2017-03-26 18:33:05 -04:00
Thomas Harte
dfc468f220 Locked down all initial state. 2017-03-26 15:47:04 -04:00
Thomas Harte
e01f3f06c8 Completed curly bracket movement. 2017-03-26 14:34:47 -04:00
Thomas Harte
3229502fa1 Standardised curly bracket placement across the Atari. 2017-03-23 21:59:16 -04:00
Thomas Harte
a26b87f348 Fixed: mistake was failure to count ready cycles. 2017-03-20 20:44:03 -04:00
Thomas Harte
4c3cc42c91 This gives a very noisy version of the real audio. 2017-03-20 20:38:29 -04:00
Thomas Harte
f3f4e1a541 Made a first, hacky, attempt at audio. 2017-03-20 19:35:51 -04:00
Thomas Harte
4722f6b5c4 Fixed sprite disappearance: test should be applied predecrement, not post — it relates to the address being used this access, not the next one. 2017-03-19 18:58:35 -04:00
Thomas Harte
7d8d1c7828 Fixed 'random' number generator. 2017-03-19 18:54:35 -04:00
Thomas Harte
4bb70e7d31 Resetting the mask upon low byte write appears to resolve some issues. 2017-03-19 18:49:37 -04:00
Thomas Harte
321030bb44 Added a slightly faulty but seemingly 'close' version of masking. 2017-03-19 18:28:06 -04:00
Thomas Harte
6c161b1150 This gives something that might be the correct background. 2017-03-19 17:49:48 -04:00
Thomas Harte
d5c37c8619 Shushed a little, so as to be able to see a reasonable amount of output during my lifetime. 2017-03-19 17:38:54 -04:00
Thomas Harte
7c66c36d3f Attempted at least to manage appropriate data storage. 2017-03-19 17:31:08 -04:00
Thomas Harte
031a68000a Added a class to contain the Pitfall 2 pager and a skeleton of initial work. 2017-03-18 22:08:47 -04:00
Thomas Harte
c3d82f88a5 Tidied up and commented on the Activision stack implementation. 2017-03-18 21:01:58 -04:00
Thomas Harte
c033bad0b9 Here's MNetwork! 2017-03-18 20:51:49 -04:00
Thomas Harte
c31d85f820 Re-emplaced the MegaBoy. Also cut detritus from the main Atari header. 2017-03-18 19:02:34 -04:00
Thomas Harte
217fbf257e CBS RAM Plus returns. 2017-03-18 18:56:20 -04:00
Thomas Harte
0b611a14b9 Tigervision paging returns. 2017-03-18 18:50:13 -04:00
Thomas Harte
df6861c9dc Parker Bros paging is back. 2017-03-18 18:21:01 -04:00
Thomas Harte
a4cd12394e Reinstated the Activision stack pager. 2017-03-18 18:03:48 -04:00
Thomas Harte
e0bca1e37b Reinstated the 16 and 32 kb Atari pagers, and ensured the 6532 always starts in a valid state. 2017-03-18 17:34:34 -04:00
Thomas Harte
55ce851bb2 Fixed types of the 8k cartridges, ensured the 6502 starts without an IRQ request history. 2017-03-18 17:04:01 -04:00
Thomas Harte
e8d34f2eb4 Having farmed out the bus, the Atari itself no longer is/owns a 6502. 2017-03-18 16:34:41 -04:00
Thomas Harte
bb3daaa99b Sought to reintroduce the Atari 8k paging scheme, at the same time deciding to do away with the copy and paste of holding on to ROM data. 2017-03-18 15:04:01 -04:00
Thomas Harte
36b58d03b7 Formalised read bus value guarantee from the 6502, fixed missing clock signal wiring on the Atari cartridge class, reintroduced CommaVid support. 2017-03-18 14:46:46 -04:00
Thomas Harte
7958459db9 In theory unpaged cartridges should now work. Time to debug. 2017-03-18 14:01:04 -04:00
Thomas Harte
14a76af0d3 Started trying to float out bus control to cartridges. 2017-03-17 20:28:07 -04:00
Thomas Harte
afbd9fd41b Fixed declared line length. 2017-03-14 21:33:38 -04:00
Thomas Harte
7302703039 Implemented the Activision stack paging scheme. 2017-03-14 20:24:05 -04:00
Thomas Harte
97a8a96593 Rejigged how the memory map is handled and implemented MNetwork support. 2017-03-14 20:07:54 -04:00
Thomas Harte
3b29276228 Implemented the MegaBoy paging scheme. 2017-03-14 17:40:01 -04:00
Thomas Harte
b3632a4e86 Institutes CBS RAM Plus emulation. 2017-03-14 17:25:10 -04:00
Thomas Harte
f0d944847b Fixed setting of the second 1kb. 2017-03-11 18:16:29 -05:00
Thomas Harte
add14fb43a Made an attempt to implement Tigervision paging. 2017-03-11 17:44:35 -05:00
Thomas Harte
33bda2d40c Switched to image inspection for RAM guesses rather than disassembly. Which fixes the other Parker Bros titles. 2017-03-11 13:04:23 -05:00
Thomas Harte
2b5e3a600e Made a first attempt at implementing the Parker Bros pager within the emulation. 2017-03-11 12:43:12 -05:00
Thomas Harte
9c72ce5bd2 Ensured a settling delay is permitted before an NTSC/PAL decision is made. To avoid false switches just due to startup. 2017-03-06 19:37:35 -05:00
Thomas Harte
79784a8e57 Followed tip: missiles are locked to the position after four output pixels, not four input pixels. 2017-03-04 22:23:50 -05:00
Thomas Harte
4751615623 Fixed NTSC colour cycle count, and hence the 2600's reported line lengths and phase offset. 2017-03-04 17:31:39 -05:00
Thomas Harte
d3257c345a Tested against public ROMs and corrected. Also moved the deferred adjustment into a more canonical place. 2017-03-04 17:00:28 -05:00
Thomas Harte
837cccdf83 Switched to deferred updates for the 6532. 2017-03-04 14:58:28 -05:00
Thomas Harte
93d1573481 Added a fix for certain homebrews. 2017-03-01 07:59:25 -05:00
Thomas Harte
893a5dd007 Added an artificial low pass filter, attempting to capture post-digital effects. 2017-02-28 21:29:55 -05:00
Thomas Harte
06dd98b23c Pulled the reset time for horizontal blank extend up to position 224. 2017-02-28 20:28:54 -05:00
Thomas Harte
184c8ae707 Extended to emulate the CommaVid. 2017-02-27 20:50:59 -05:00
Thomas Harte
9d7985c1e1 Added Super Chip emulation. 2017-02-26 17:47:29 -05:00
Thomas Harte
e6a84fd26b Attempted a hardware-correct implementation of missile-to-player latching. This completes the last of the **knowing** inaccuracies. The rest are as-of-yet unwitting. 2017-02-26 15:12:31 -05:00
Thomas Harte
440467ea3e Started communicating which copy is being requested. 2017-02-26 13:39:25 -05:00
Thomas Harte
98376de9ad Started returning 'no effect' for pot ports, rather than doing nothing. Still very much TODO though. 2017-02-25 22:58:58 -05:00
Thomas Harte
e61e355251 Moved to the maximum possibly required queue length of 4. Though the emulated 2600 should never need more than 2 slots as per the current calling pattern, it's not a contractual guarantee. 2017-02-25 17:25:10 -05:00
Thomas Harte
c898c8a99e Ensured the missiles and ball don't attempt to enqueue. Because I don't think they're supposed to. 2017-02-25 17:13:22 -05:00
Thomas Harte
8c9062857c Added a single-slot queue for player objects to defer drawing, thereby deferring pixel lookup. Which I think is correct. Though more slots might be needed. 2017-02-25 17:10:24 -05:00
Thomas Harte
77ed4ddc05 Slightly simplified ready line release logic. 2017-02-23 21:08:32 -05:00
Thomas Harte
82f392fada This should be the other way around. I want whichever is later. 2017-02-22 21:54:49 -05:00
Thomas Harte
8291a63d5f Fixed loss of audio when switching to PAL. 2017-02-22 21:15:37 -05:00
Thomas Harte
6120dae61a While I'm using the hacky approach to player/missile synchronisation, I need to seed adder. 2017-02-22 07:39:11 -05:00
Thomas Harte
4f5f191cd6 Fixed: will no longer attempt to output pixels from before the pixel part of a line on which sync was disabled abruptly. 2017-02-22 07:33:36 -05:00
Thomas Harte
21abf4e9fc Enshrined a terminology switch, albeit without any flow change behind it. 2017-02-22 07:29:48 -05:00
Thomas Harte
144d6b70d9 Minor cleaning. 2017-02-22 07:14:30 -05:00
Thomas Harte
b769f22ca0 Switched back to the collision_buffer_ being part of the TIA object, added one more assert. 2017-02-21 22:26:20 -05:00
Thomas Harte
7019d396d0 Threw in some asserts, discovering a bug in missile positioning. 2017-02-21 22:04:27 -05:00
Thomas Harte
f4447fd9cd Attempted to fix failure of sprites properly to wrap when performing motion. 2017-02-21 21:53:09 -05:00
Thomas Harte
36396b3d62 Made a slightly better, albeit still inaccurate, version of missile-player lock.Enough for Combat to do reasonable things. 2017-02-21 20:45:20 -05:00
Thomas Harte
d1dbf8c21f Missile to player lock is supposed to be a toggle; also factored out the commonalities of missile and ball drawing. 2017-02-21 07:58:37 -05:00
Thomas Harte
1bde0fed6f Simplified relationship between Objects and the usage-specific components through inheritance. 2017-02-21 07:37:20 -05:00
Thomas Harte
7ab2358bba Made an attempt to reintroduce missiles. 2017-02-20 22:22:39 -05:00
Thomas Harte
99547181f1 Attempted to template this thing. Without yet a plan in place for pixel lookup timing. 2017-02-20 21:42:59 -05:00
Thomas Harte
2bf784535c Simplified calllng. 2017-02-20 18:04:40 -05:00
Thomas Harte
57f434c199 Reorganised state, with an eye towards unifying object motion and triggers. 2017-02-20 17:58:28 -05:00
Thomas Harte
99a35266e1 Attempted to bring frequency-switching logic into the cross-platform realm. Which for now creates an issue with the OpenGL context. 2017-02-19 21:20:37 -05:00
Thomas Harte
51bcaea60c Disabled incorrect 'optimisations'. 2017-02-19 12:00:04 -05:00
Thomas Harte
e00339ef0a Attempted to reintroduce the ball. 2017-02-19 08:02:54 -05:00
Thomas Harte
53cd125712 Added stub calls to draw the missiles and ball. 2017-02-19 07:28:24 -05:00
Thomas Harte
04693b067c Fixed failure of the optimised route to pump the pixel clock; removed optimisation entirely for now. 2017-02-18 21:36:48 -05:00
Thomas Harte
cd7876a746 Reintroduced the extra clocking delay. 2017-02-18 20:18:50 -05:00
Thomas Harte
ed5ff49ef5 Fixed vertical delay, retreated from my previous thought about adding the one extra cycle of sprite delay, at least temporarily. 2017-02-16 20:52:01 -05:00
Thomas Harte
8d502a0b03 Decided not to run before I can walk and switched to storing the motion time and next step explicitly per object. 2017-02-16 20:28:37 -05:00
Thomas Harte
5ea232310f Added a check against negative runs. 2017-02-16 18:55:58 -05:00
Thomas Harte
09309aa74f Attempted to prevent extraneous moves. 2017-02-16 18:52:39 -05:00
Thomas Harte
b5357860b9 Made an attempt to split things apart so as to be able to introduce the proper sprite latency. 2017-02-14 20:56:16 -05:00
Thomas Harte
cd90118a0f Added two, extraordinarily simple tests. 2017-02-12 20:32:53 -05:00
Thomas Harte
25776de59d I think unit testing this thing is the only way forwards. Started adding appropriate hooks. 2017-02-12 19:55:02 -05:00
Thomas Harte
600bdc9af7 In C++, I think the implicit cast to bool negates the need for any manual collapsing? 2017-02-12 18:18:35 -05:00
Thomas Harte
0c9be2b09e Shunted the collisions buffer onto a separate area of the heap for the time being, as a debugging aid. Also added a few more initial values. 2017-02-12 18:16:50 -05:00
Thomas Harte
df8a5cbe6d Made attempts (i) to respect the delay flag; and (ii) to account for border-region sprite clocking. 2017-02-12 17:35:09 -05:00
Thomas Harte
9ce68c38ae Made an effort to implement proper pixel output for sprites. 2017-02-12 14:01:50 -05:00
Thomas Harte
40954d6a2a Attempted to factor out parts I expect to reuse for missiles and the ball. 2017-02-12 11:31:17 -05:00
Thomas Harte
ac444a3f34 Corrected both position increments and target time calculation. 2017-02-11 21:24:14 -05:00
Thomas Harte
b8abeced6d Made an attempt to introduce the proper eventful loop for player output. With debugging yet to occur. 2017-02-11 21:01:58 -05:00
Thomas Harte
aeff59addc Implemented motion 'correctly', for programs written to do all work outside of the pixel area. 2017-02-11 20:25:49 -05:00
Thomas Harte
aff69dbc34 Resolved spurious static analyser issue; screen mode will always be 0–6 but it doesn't know that. Setting a non-zero divider doesn't feel worth worrying about for a cleaner compile. 2017-02-11 13:35:22 -05:00
Thomas Harte
6381e4e1b0 All that's happened to position is that numbers have been added to it. So it can't be negative, given that it wasn't before. So a regular modulo will do. 2017-02-11 13:34:36 -05:00
Thomas Harte
905ed1f87b Switched to the more natural type, which is also signed, making my logic less prone to error. 2017-02-11 13:16:53 -05:00
Thomas Harte
8de6caf6ff Started trying to get into a proper structure here. Chickened out. 2017-02-11 12:59:13 -05:00
Thomas Harte
40d3f5f7f6 Attempted properly to respect start. 2017-02-11 08:26:09 -05:00
Thomas Harte
64d5712d1d Added an incorrectly-coded version of horizontal move, at least so that I can verify that information is going into the correct slots. 2017-02-10 07:23:43 -05:00
Thomas Harte
3b20d862f0 Made an initial attempt to mark sprite positions. But without hmove implemented, they're all over the place. 2017-02-09 20:53:42 -05:00
Thomas Harte
2e9ef2b0ef Took a shot at reinstating the horizontal blank extend flag. 2017-02-09 18:37:19 -05:00
Thomas Harte
70745286a5 Ensured this array is properly aligned for the uin32_t accesses I intend to make for background drawing. 2017-02-08 20:25:23 -05:00
Thomas Harte
dcb7584060 Added the four-cycle playfield output latency and ensured you can't get smaller-than-usual pixels by rapid register value changing. 2017-02-08 07:30:32 -05:00
Thomas Harte
a477499724 Got a bit more explicit with range returned by get_cycles_until_horizontal_blank and hence attempted a more thorough (/correct) version of WSYNC. 2017-02-07 22:14:45 -05:00
Thomas Harte
944d835eea Switched explicitly to an accumulation model for filling the collision buffer. 2017-02-06 21:59:28 -05:00
Thomas Harte
8f5039130c Changed index naming order to ensure no out-of-bounds accesses. 2017-02-06 21:48:41 -05:00
Thomas Harte
ba165bb70a Made an attempt properly to populate collision registers from the collision buffer. 2017-02-06 21:15:55 -05:00
Thomas Harte
474e2e8d2c Fixed once again to respect mid-line palette changes. 2017-02-06 20:09:12 -05:00
Thomas Harte
8b8eb787df Fixed complete invisibility. 2017-02-06 18:42:58 -05:00
Thomas Harte
66bcdd36f3 Made an attempt to introduce an intermediate buffer that ends up with a bit mask of all graphical components present on it, and to use that to infer collision flags and colours, based on playfield priority and colour palette. Immediately yielding: a blank screen. Good work! 2017-02-06 18:29:00 -05:00
Thomas Harte
6bcf95042c Started trying to be a bit more explicit about usage, and to divide up drawing responsibility. 2017-02-05 17:51:56 -05:00
Thomas Harte
f2437cb257 Added some additional documentation, started making steps towards returning sprites, fixed a counter bug that would exhibit as incorrect sync. 2017-01-31 20:30:32 -05:00
Thomas Harte
abe04334c2 Attempted to retain more player information, and removed the output cursor from class storage as I think it's acceptable as a temporary. 2017-01-30 22:42:27 -05:00
Thomas Harte
8545707b54 Reinstituted the playfield. Probably needs more buffering though. Time to look into delays. 2017-01-30 21:38:58 -05:00
Thomas Harte
2b08758b2b Started capturing playfield/ball and background colours. 2017-01-30 08:08:03 -05:00
Thomas Harte
764b528891 Made a first attempt at switching to a model that respects blank and sync. 2017-01-30 07:19:19 -05:00
Thomas Harte
92754ace7a Some mild fixes get me up to having a rolling screen of vertical lines. Which is what I was hoping for right now! 2017-01-29 22:16:23 -05:00
Thomas Harte
d51f185dc7 Made an attempt to reintroduce the basic horizontal loop. 2017-01-29 15:43:57 -05:00
Thomas Harte
2390358c24 Prevented unbounded CPU usage, albeit without yet deciding who has authority for the clock rate. 2017-01-29 14:19:26 -05:00
Thomas Harte
2432a3b4d7 Fixed condition — >= is smarter. 2017-01-29 14:00:01 -05:00
Thomas Harte
9c3597c7e3 Attempted to reintroduce enough logic to handle [most of] line timing, such that WSYNC works. Initial objective is to get back to having a working background. 2017-01-29 13:47:36 -05:00
Thomas Harte
fba6baaa9c Stubbed and disabled to get back to building. 2017-01-28 21:56:01 -05:00
Thomas Harte
a246530953 Supposing the TIA were implemented, this is (more or less) what the Atari 2600 would now look like. 2017-01-28 21:46:40 -05:00
Thomas Harte
0ffded72a6 Created a placeholder class for a factored-out TIA. There's a bit more it'll need to do, like vending (or receiving) a CRT but this is the full hardware stuff, I think. 2017-01-28 16:19:08 -05:00
Thomas Harte
6d087ca054 Restored 2600 audio. 2017-01-25 21:29:19 -05:00
Thomas Harte
be1cb2a551 Fixed NTSC phase. 2017-01-11 21:31:24 -05:00
Thomas Harte
6153ada33b Fixed Electron's support for automatically booting floppy disks. 2017-01-08 14:46:19 -05:00
Thomas Harte
8cd1575891 Similar fix to that over in Oric land: ensure a known, effective initial value for the Plus 3's control register. 2016-12-28 18:52:36 -05:00
Thomas Harte
90151e2094 Fixed to ensure a known initial control register value, which has taken effect. 2016-12-28 18:49:32 -05:00
Thomas Harte
a568172758 Made steps towards proper CRC generation. Am currently comparing against Oric disk images, as — amongst other things — they include precomputed CRCs. 2016-12-28 18:29:37 -05:00
Thomas Harte
4fca30b81f Made the Plus 3 less chatty, documented invalidate_track. 2016-12-25 21:06:58 -05:00
Thomas Harte
3805e3d17d Ensured base address is set properly at construction. 2016-12-22 22:46:02 -05:00
Thomas Harte
63107cd492 Tidied, very slightly. 2016-12-15 19:49:25 -05:00
Thomas Harte
a555c5762a Rearranged code, hopefully into a more logical grouping. 2016-12-15 19:47:04 -05:00
Thomas Harte
4a7ddaf2e9 Added documentation and a quick note to self. 2016-12-15 19:43:04 -05:00
Thomas Harte
f61176cd7d Reinstituted something of the don't-do-pixel-work-until-an-affecting-write-occurs optimisation. 2016-12-15 19:20:14 -05:00
Thomas Harte
c1c70a767a Attempted fully to reinstate proper timing. 2016-12-15 18:52:16 -05:00
Thomas Harte
0326316bb8 Reinstated whole-frame counting. Thereby to reinstate proper interrupts. 2016-12-15 18:09:49 -05:00
Thomas Harte
b58b11fc93 Switched to a table-based dispatch of line-by-line actions, primarily to simplify. 2016-12-15 18:07:46 -05:00
Thomas Harte
fd541e1142 An early draft; dealing with the issue that not all cycles are necessarily consumed in a single call. Incomplete; broken. Committing for cross-machine visibility. 2016-12-12 08:01:10 -05:00
Thomas Harte
be7e05e109 Started attempting to move total responsibility for display-related interrupts and RAM timing into the video. 2016-12-11 18:34:49 -05:00
Thomas Harte
c5cf8d9531 Ensured the video subsystem correctly handles requests to run over a frame boundary. 2016-12-11 16:17:51 -05:00
Thomas Harte
52028432e1 Restored some semblance of output. 2016-12-10 22:19:10 -05:00
Thomas Harte
0aae1bd1ef Fixed calculation of termination cycle. 2016-12-10 21:35:41 -05:00
Thomas Harte
c43e481a33 Started factoring video out of the Electron. 2016-12-10 21:07:52 -05:00
Thomas Harte
e62be03673 Removed endianness assumption. 2016-12-10 19:10:33 -05:00
Thomas Harte
a5683dfb21 Removed now untrue comment. 2016-12-10 15:19:48 -05:00
Thomas Harte
0e71802b92 Reduced Oric video to single nibble constants. Removed attempt at asynchronous flush as no longer required. 2016-12-10 14:17:46 -05:00
Thomas Harte
580f347727 Fixed Oric SCART mode by having it change what it's giving to the CRT based on which shader it knows will be active. 2016-12-10 13:55:56 -05:00
Thomas Harte
a549fd1ecc Introduced the ability simply to piggy-back off the CRT's natural phase for the colour burst, thereby eliminating a couple of redundant independent attempts in the Oric and Electron. 2016-12-10 13:42:34 -05:00
Thomas Harte
6cdd41e5a9 Added direct use of the colour ROM, uploading 16 bits per pixel to contain the entire ROM composite wave. 2016-12-09 22:17:10 -05:00
Thomas Harte
3b5962b171 This is an initial attempt at using the actual Oric colour ROM values for composite video generation. 2016-12-09 20:01:27 -05:00
Thomas Harte
c304db0f5a Deintegrated the busy flag and the interrupt request line, as the latter is reset by status reads. Which also means I can start reporting the WD INTRQ line status directly from the Microdisc. That appears to be correct, rather than honouring the Microdisc IRQ select there. 2016-12-06 21:16:29 -05:00
Thomas Harte
ebb62a2d78 Switched the 2600 to postfix and non-camel-case instance variable names. 2016-12-03 14:07:38 -05:00
Thomas Harte
b81c058c0a Factored out the Atari 2600's 6532 connection, as a low-hanging fruit. 2016-12-03 13:41:55 -05:00