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410 Commits

Author SHA1 Message Date
Thomas Harte
5d2d3944ef Make VRAM access delay a timing property. 2023-01-07 12:48:43 -05:00
Thomas Harte
f9e21df701 Avoid further hard-coded 342s. 2023-01-07 09:13:34 -05:00
Thomas Harte
bb436204f6 Merge branch 'VDPs' of github.com:TomHarte/CLK into VDPs 2023-01-07 09:10:50 -05:00
Thomas Harte
de45536b5c Elucidate a magic constant, add an extra constexpr. 2023-01-07 09:10:41 -05:00
Thomas Harte
ebc1264c2c Create a common home for timing information. 2023-01-06 22:39:46 -05:00
Thomas Harte
4875148617 Fill in Mega Drive numbers. 2023-01-05 14:22:51 -05:00
Thomas Harte
7a82b76911 Ensure visibility of memset. 2023-01-05 13:21:03 -05:00
Thomas Harte
27d37f71ec Generalise and better factor bit reversal and TMS drawing. 2023-01-05 13:18:10 -05:00
Thomas Harte
c4a5a9763e Minor indentation improvement. 2023-01-02 15:04:50 -05:00
Thomas Harte
a9f97ac871 Fix nothing-to-do test. 2023-01-02 15:04:08 -05:00
Thomas Harte
475440dc70 Update ClockConverter for potential alternative clocks. 2023-01-02 14:59:36 -05:00
Thomas Harte
dc3f8f5e42 These are the three fetchers to implement. 
They'll look fairly different from the TMS and SMS fetchers, I think, owing to the greater irregularity that comes with the smarter RAM accesses. I might need to play around for a while.
 2023-01-01 22:44:06 -05:00
Thomas Harte
459ef39b08 constexpr the TMS palette. 2023-01-01 22:34:07 -05:00
Thomas Harte
27812fd0e2 Separate fetchers into their own header. 2023-01-01 22:26:50 -05:00
Thomas Harte
38eb4d36de Better explain cumulative nature of @c to_internal. 2023-01-01 22:18:39 -05:00
Thomas Harte
2bd20a0cf8 Add further exposition. 2023-01-01 22:17:21 -05:00
Thomas Harte
da61909ec5 Explain the purpose here. 2023-01-01 21:20:30 -05:00
Thomas Harte
5729ece7bb Incompletely transitions towards more flexible clock ratios. 2023-01-01 14:20:45 -05:00
Thomas Harte
151f60958e Relocate the 9918 implementation file. 2023-01-01 14:01:19 -05:00
Thomas Harte
180045ada6 Convert vram_access_delay into a free-standing function. 2023-01-01 13:51:52 -05:00
Thomas Harte
11542e7a7f Improve const correctness, simplify inheritance. 2023-01-01 13:49:11 -05:00
Thomas Harte
71598250ea Improve commentary. 2023-01-01 13:41:51 -05:00
Thomas Harte
ffb0b2ce0b Eliminate runtime duplication of personality. 2022-12-31 21:50:57 -05:00
Thomas Harte
b7c315058f Also template Base. 2022-12-31 21:47:05 -05:00
Thomas Harte
7d6eac2895 Template the TMS on its personality. 
Template parameter currently unused, but preparatory to other improvements.
 2022-12-31 15:08:33 -05:00
Thomas Harte
d79aac3081 Shuffle the personality enum into the 'public' header. 2022-12-31 15:01:11 -05:00
Thomas Harte
8d5547dc9e Minor further style improvements. 
... as I refamiliarise myself.
 2022-12-29 22:09:14 -05:00
Thomas Harte
5d89293c92 Improve constness, primarily of reverse_table. 2022-12-29 11:29:19 -05:00
Thomas Harte
711f7b2d75 C++17 makes this a single step. 2022-12-27 22:50:12 -05:00
Thomas Harte
dca8c51384 Prefer to avoid a macro. 2022-12-27 22:36:27 -05:00
Thomas Harte
462b7dcbfa Add Mega Drive VRAM size. 2022-12-27 22:28:43 -05:00
Thomas Harte
2ab4b351ca Extend enum. 2022-12-27 22:20:47 -05:00
Thomas Harte
99ced5476f Add quick clock-rate notes. 2022-12-26 22:56:45 -05:00
Thomas Harte
1d5144b912 Correct no-interrupt signal. 2021-06-04 22:38:07 -04:00
Thomas Harte
1266bbb224 Makes the TMS a sequence-point-generating JustInTimeActor. 2021-04-05 21:02:37 -04:00
Thomas Harte
650b9a139b Tweak Master System blue scale. 2021-03-19 08:38:21 -04:00
Thomas Harte
a17d0e428f Protects against some further uninitialised values. 2020-09-16 18:15:57 -04:00
Thomas Harte
3cb1072c29 Adds an explicit [[fallthrough]] tag. 2020-06-19 23:10:25 -04:00
Thomas Harte
267006782f Starts to add Qt target; resolves many build warnings. 2020-05-30 00:37:06 -04:00
Thomas Harte
512a52e88d Increases const correctness, marks some additional constructors as constexpr, switches std::atomic construction style. 2020-05-20 23:34:26 -04:00
Thomas Harte
66c2eb0414 Further tightens const and constexpr usage. 2020-05-12 22:22:21 -04:00
Thomas Harte
25996ce180 Further doubles down on construction syntax for type conversions. 2020-05-09 23:00:39 -04:00
Thomas Harte
a7e1920597 Restores ColecoVision runtime options. 2020-03-18 00:06:52 -04:00
Thomas Harte
9d97a294a7 Corrects the TMS' get_scaled_scan_status. 
I think all platforms are now returning credible numbers.
 2020-01-22 19:34:10 -05:00
Thomas Harte
a71c5946f0 Ensures proper manipulation of scan_statuses, leading to the correct result out of a CRTMachine. 
Possibly with the exception of the TMS, as I appear to have uncovered an unrelated issue there.
 2020-01-21 22:28:25 -05:00
Thomas Harte
d97a073d1b Adds the necessary routine for all machines to be able to respond to get_scan_status. 
They all just as the CRT, as all are currently based on the CRT. Which doesn't currently know the total clock rate it would need to in order properly to scale the answer to the question. Further thought coming.
 2020-01-20 21:45:10 -05:00
Thomas Harte
c1bae49a92 Standardises on read and write for bus accesses. 
Logic being: name these things for the bus action they model, not the effect they have.
 2020-01-05 13:40:02 -05:00
Thomas Harte
274867579b Deploys constexpr as a stricter const. 2019-12-22 00:22:17 -05:00
Thomas Harte
a847654ef2 Corrects various old-fashioned bits of indentation, plus the odd const. 2019-12-22 00:00:23 -05:00
Thomas Harte
1c154131f9 Expands size of storage in Cycles/HalfCycles; adjusts widely to compensate. 2019-10-29 22:36:29 -04:00
Thomas Harte
929475d31e Minor correction: round down, not up. 2019-09-28 23:49:32 -04:00
Thomas Harte
d97348dd38 Eliminates dangling uses of printf. 2019-03-02 18:07:05 -05:00
Thomas Harte
601961deeb Wires through set_display_type. 2018-11-29 20:44:21 -08:00
Thomas Harte
64465f97b6 Starts towards reintroducing the proper mechanisms for selecting a display type at runtime. 2018-11-28 17:53:33 -08:00
Thomas Harte
5618288459 Reduces visible area, producing a tighter crop. 2018-11-25 22:32:12 -05:00
Thomas Harte
ee89be6730 Removes many stray spaces. 2018-11-23 22:32:32 -05:00
Thomas Harte
770d7e90e9 Removes stale sampling functions. 2018-11-22 22:47:29 -05:00
Thomas Harte
c5d9bf2c12 Optimises slightly for black borders. 
Specifically to help to debug proper display of unused lines in the new scan target.
 2018-11-17 18:23:42 -05:00
Thomas Harte
15b1176841 Ensures no border output if space is not allocated. 2018-11-14 22:32:33 -05:00
Thomas Harte
9dff13cbbf Re-establishes output from the machines with 9918s and derivatives. 2018-11-14 22:25:19 -05:00
Thomas Harte
6d277fecd5 Makes ScanTarget a little more communicative and orthogonal. 2018-11-10 19:52:57 -05:00
Thomas Harte
f6562de325 Possibly adds enough for the Electron and ZX80 to start outputting dummy lines. 
Let's see!
 2018-11-03 23:40:39 -04:00
Thomas Harte
b40211d2c0 Starts to bend 'CRTMachine' to a world farther from owning the GPU relationship. 2018-11-03 21:54:25 -04:00
Thomas Harte
da4d883321 Adds first, incomplete attempts to talk to a ScanTarget from the CRT. 
Does away with the hassle of `unsigned` while I'm here; that was a schoolboy error.
 2018-11-03 19:58:44 -04:00
Thomas Harte
f65d80b7d1 Ensures offset and flags are initialised to 0. 
This prevents a potential crash at startup.
 2018-10-29 22:09:32 -04:00
Thomas Harte
8652d8b23d (Mostly) randomises the 9918 start position. 2018-10-26 21:02:56 -04:00
Thomas Harte
e02aa885d8 Testing against the ColecoVision suggests this is probably always 7. 2018-10-26 20:59:12 -04:00
Thomas Harte
bb09762029 Introduces extra delays to VRAM access. 2018-10-26 20:19:08 -04:00
Thomas Harte
05a5c7120e Shunts CRAM dots into their proper place. 2018-10-26 20:06:51 -04:00
Thomas Harte
521d603902 Adds a first attempt at CRAM dot output. With a TODO. 2018-10-26 19:26:46 -04:00
Thomas Harte
916710353a Makes it explicit that I want the reference. 2018-10-25 23:18:34 -04:00
Thomas Harte
53b00dea3f Adds missing include. 2018-10-25 23:12:41 -04:00
Thomas Harte
0587b9f257 Edges to within millimetres of CRAM dots. 
... but all the way up to bedtime.
 2018-10-25 23:12:03 -04:00
Thomas Harte
5accd8cf08 Fixes broken implementation of 9918 multicolour mode. 2018-10-24 22:40:38 -04:00
Thomas Harte
a8645f80bf Introduces 'non-exclusive' emulator-space keyboards. 
i.e. sets of keys that don't amount to an entire keyboard in the modern sense. Experimentally used by the Master System for its reset key.
 2018-10-24 21:59:30 -04:00
Thomas Harte
d61c3a9442 Fixes sprite list termination in 224- and 240-line modes. 2018-10-24 19:53:46 -04:00
Thomas Harte
2cdeaa2575 Moves misplaced bracket. 2018-10-23 22:37:19 -04:00
Thomas Harte
286783e880 Accepts GCC's suggestion of extra clarity brackets. 2018-10-23 22:36:23 -04:00
Thomas Harte
00e7958a97 Separates request for an SMS2 VDP from current graphics mode. 
Thereby fixes various minor segments of Codemasters games.
 2018-10-23 22:19:45 -04:00
Thomas Harte
2f995eb622 Adjusts vertical timing for display height. 2018-10-23 21:20:44 -04:00
Thomas Harte
90fbad0f1c Implements SMS2-style addressing if in a 224 or 240-line mode. 
This isn't quite accurate, but it'll do for development.
 2018-10-23 20:30:08 -04:00
Thomas Harte
2cbd28478d Allows the sprite terminator to be specified. 2018-10-23 20:01:47 -04:00
Thomas Harte
7855145ebd Slightly adjusts pixel output time. 
i.e. respective to reading; sprite collision times now seem correct.
 2018-10-22 19:58:33 -04:00
Thomas Harte
883680731a Uses explicit state to determine whether a pixel target has been requested. 2018-10-21 21:18:41 -04:00
Thomas Harte
c07f9fed99 Corrects test and implementation to pass the exhaustive VDP interrupt prediction test. 2018-10-21 18:42:49 -04:00
Thomas Harte
16f08eb654 Slightly tweaks Master System timing numbers. 2018-10-21 13:58:34 -04:00
Thomas Harte
30b99f0049 Fixes a couple of interrupt prediction errors. 2018-10-20 18:25:28 -04:00
Thomas Harte
b61de65b43 Restores proper phase with the CPU. 2018-10-19 23:18:16 -04:00
Thomas Harte
0822c96ce0 Implements the proper row counter values for > 192 row modes. 2018-10-19 22:37:56 -04:00
Thomas Harte
f9a6c00493 Makes first attempt to support PAL timings. 2018-10-19 21:36:13 -04:00
Thomas Harte
4cd65eab5c Seeks to avoid bad macro expansion. 2018-10-18 22:36:25 -04:00
Thomas Harte
9bc09046c0 Attempts to ensure that sprites can go off the top of the screen. 2018-10-18 21:48:57 -04:00
Thomas Harte
512f085891 Ensures proper left clipping of sprites. 2018-10-18 21:14:16 -04:00
Thomas Harte
da00c832f5 Corrects colour fetching for multicolour text mode. 2018-10-18 20:38:00 -04:00
Thomas Harte
8ff265c3a1 Corrects multicolour text mode. 2018-10-18 20:25:42 -04:00
Thomas Harte
1fc88c4eff Corrects off-by-one error in line fetching coroutines. 2018-10-16 21:36:31 -04:00
Thomas Harte
58ca74c68a Resolves right-side TMS sprite droppages. 2018-10-16 21:25:08 -04:00
Thomas Harte
b4f871a2ef Corrects first line sprite row selection. 2018-10-16 21:16:29 -04:00
Thomas Harte
0f7bf6d6c6 Resolves attempt to output graphics on the line one before the display. 2018-10-16 21:02:31 -04:00
Thomas Harte
5dfe7d8596 Corrects most of TMS sprite drawing. 2018-10-16 20:49:04 -04:00
Thomas Harte
231009b901 Makes faulty attempt to reintroduce TMS-mode sprites. 2018-10-16 20:00:06 -04:00
Thomas Harte
1c5f939aea Reintroduces tiles and some element of sprites in regular TMS mode. 2018-10-14 21:52:13 -04:00
Thomas Harte
c1e6406fc9 Corrects sprite accumulation. 2018-10-14 19:56:09 -04:00
Thomas Harte
d66979c68f Switched to a very large number of buffers, and resolved stupid attempt to reassign a reference. 2018-10-14 18:19:11 -04:00
Thomas Harte
6c09abc6cb Makes a flawed attempt to reformulate this exactly as two separate processes on a common clock with an interchange buffer. 
Specifically because closer inspection of the TMS modes shows it isn't quite valid to model output of one line as having fully completed prior to fetching of the next. So some sort of extra buffer is required. At which point it is most natural to continue with the logic that each fetch routine is oriented around the fetching process for a single line, and each output routine has the same view, suggesting separate read/write addresses.

Something is wrong though, as video data is being output too rapidly (I think) and with occasional sync issues (again: subject to investigation).
 2018-10-14 16:23:45 -04:00
Thomas Harte
9e52ead09a Ensures sprite scanning doesn't improperly set collision flag; that slot 151 is filled. 2018-10-12 19:50:48 -04:00
Thomas Harte
9ab0c54426 Eliminates faulty attempt to satisfy SMSVDP vertical counter test. 2018-10-12 18:57:07 -04:00
Thomas Harte
f6af6778ab Moves scrolling latch to proper position and implements 4-window fetching offset. 2018-10-11 22:36:27 -04:00
Thomas Harte
6a94dda60d Selects potentially-correct interrupt times. 2018-10-11 21:42:09 -04:00
Thomas Harte
82b7944599 Fixes horizontal counter wrapping. 2018-10-11 20:37:29 -04:00
Thomas Harte
52e02db5c8 Introduces horizontal counter latching and reading. 
Then makes a new guess at frame IRQ position. But gets it wrong. Hmmm.
 2018-10-11 19:56:32 -04:00
Thomas Harte
9a933993f5 Added TODO. 2018-10-10 22:17:17 -04:00
Thomas Harte
062b2ae8d3 Corrects calculation of [NTSC, 192 line] current row. 2018-10-10 22:15:38 -04:00
Thomas Harte
9f69dbf31a Adds half-updating of RAM pointer. 
This emulator now passes the first screen of the SMS VDP test.
 2018-10-10 21:59:08 -04:00
Thomas Harte
63fb3f03d1 Corrects address loading upon accesses of registers other than 0. 2018-10-10 21:47:48 -04:00
Thomas Harte
2e379b0834 Adds latching of scroll values. 2018-10-10 21:28:18 -04:00
Thomas Harte
f00f6c8c23 Allows the frame interrupt to be placed anywhere in the frame. 2018-10-10 21:07:39 -04:00
Thomas Harte
50e23f4a2e Fixes 16px-high sprites. 2018-10-10 20:34:00 -04:00
Thomas Harte
acdc84e08c Improves test slightly, and fixes line interrupt reload value setting. 2018-10-09 22:14:35 -04:00
Thomas Harte
c128ddb549 Introduces a first unit test for line interrupts and corrects backup behaviour. 2018-10-09 21:49:21 -04:00
Thomas Harte
dccf17e770 Makes a first serious attempt at Master System line interrupts. 2018-10-09 20:51:09 -04:00
Thomas Harte
2d8ab72e22 Fixed proper starting position for (interrupted) tile drawing. 2018-10-08 23:13:37 -04:00
Thomas Harte
748366c70e Corrects buffer overrun when the horizontal scroll lock is on. 2018-10-08 23:06:22 -04:00
Thomas Harte
7a74fe2ff7 Corrects tile plotting window and eliminates a redundant local. 2018-10-08 22:56:31 -04:00
Thomas Harte
e410302237 Switches to real SMS line output composition. 
Including setting the sprite collision bit.
 2018-10-08 22:43:10 -04:00
Thomas Harte
bca2161a05 Fixes TMS text mode for the new addressing order. 2018-10-07 21:09:01 -04:00
Thomas Harte
5f789092be Flips sprite priority in the temporary renderer. 
The better to test other issues in the interim.
 2018-10-07 19:16:35 -04:00
Thomas Harte
6975ed22c0 Doubles down on address-storage format, and implements the vertical scrolling lock. 2018-10-07 18:55:35 -04:00
Thomas Harte
3bead07043 Introduces proper indirection for sprite patterns. 
This seems to work, so the onus is now back on the rendering loop.
 2018-10-07 17:15:42 -04:00
Thomas Harte
ee20e42372 Makes initial attempt at collecting sprite contents. 
With test plotting, indicating some sort of issue.
 2018-10-07 16:53:25 -04:00
Thomas Harte
df411b4ede Corrects storage of visible sprites. 2018-10-07 16:40:32 -04:00
Thomas Harte
bfb9d8ccb6 At least attempts to use proper addressing for sprite info fetches. 2018-10-07 14:32:20 -04:00
Thomas Harte
338aec2930 Groups background fetches and experimentally seeks to daub sprites as white. 2018-10-06 22:07:04 -04:00
Thomas Harte
e6510dc87b Attempts to get at least as far as picking visible sprite indices. 2018-10-06 19:27:19 -04:00
Thomas Harte
7830cda912 Implements line querying and most of line interrupts. 2018-10-04 22:50:35 -04:00
Thomas Harte
aac97a8983 Re-revokes fine scroll on the top two lines when requested. 2018-10-04 19:18:15 -04:00
Thomas Harte
ca26dfcd61 Correct Master System palette writes. 2018-10-04 19:12:31 -04:00
Thomas Harte
858721a7a5 Added left border hiding. 2018-10-04 18:52:23 -04:00
Thomas Harte
89db1d6a6a Switches to a more accurate means of left-padding. 2018-10-04 18:44:49 -04:00
Thomas Harte
de4e5c40aa Implements horizontal scrolling lock. 2018-10-03 23:28:33 -04:00
Thomas Harte
05248ab990 Starts to reimplement Master System output. 2018-10-03 23:13:21 -04:00
Thomas Harte
252f47a425 Ensures no pixel output on line one before end, and adds a temporary debugging test. 2018-10-02 22:59:20 -04:00
Thomas Harte
be52b31b5c Attempts fully to revive text mode. 2018-10-02 22:05:58 -04:00
Thomas Harte
23c3fa6993 Fixed: it's the SMS that has 8 sprites, not text mode (which has none). 2018-10-02 22:01:43 -04:00
Thomas Harte
499fc62187 Sets things up for implementation of the inner mode-specific logic. 2018-10-02 21:58:09 -04:00
Thomas Harte
1dd5272190 Ensures real-time output of all areas, to ensure proper palette response. 2018-10-02 21:18:28 -04:00
Thomas Harte
5361120353 Restores a stable frame. 2018-10-02 21:05:30 -04:00
Thomas Harte
60bab8fdf1 Starts to reformulate TMS collection as coroutines. 
For the time being, thereby breaks all video. A static screen of the border colour is all you'll see.
 2018-10-01 23:03:17 -04:00
Thomas Harte
91aa8f9295 Amps up colour content a little. 2018-09-30 20:47:26 -04:00
Thomas Harte
23191efc05 Starts writing and referring to colour RAM for colours. 2018-09-29 19:50:13 -04:00
Thomas Harte
0d8af010b6 Takes a stab at tile reversal and vertical scrolling. 2018-09-28 22:37:10 -04:00
Thomas Harte
7b9bb772ca Corrected to give a not-exactly-indexed-correctly approximation of what's on display. 2018-09-28 21:03:51 -04:00
Thomas Harte
f7e211c245 Makes first attempt to put something vaguely like the Master System tile map on screen. 2018-09-28 20:39:14 -04:00
Thomas Harte
35c2e74af8 Attempts to establish a coroutine-ish structure for access patterns. 
The Master System mode, inevitably, is the test case.
 2018-09-27 22:33:41 -04:00
Thomas Harte
19482a563f Attempts to explicitly make room for the SMS VDP mode. 2018-09-27 21:22:57 -04:00
Thomas Harte
9683c8f664 Advances towards the Master System actually receiving interrupts. 2018-09-23 15:58:23 -04:00
Thomas Harte
e7f4babf41 Starts taking steps towards SMS/GG and V9938/9958 support. 
Specifically: routine namespace stuff, plus the intention to move to a table-based operation+cost version of timing. Reordering works fine for the TMS, and probably would also for the SMS/GG, but it'd be problematic with the command engine of the V9938/9958 and maintaining a consistent set of code is easier.
 2018-09-17 22:59:16 -04:00
Thomas Harte
a38639d099 Eliminates the concept of an iCoordinate. 
Real-life precision appears not to support the idea of sub-sample pixel storage.
 2018-09-12 20:05:39 -04:00
Thomas Harte
92065813ef Ensures only the first 8px of sprites is output in 8x8 mode. 
Also adds a little extra documentation.
 2018-07-15 22:21:29 -04:00
Thomas Harte
5d6b5d9f10 Eliminates all emdashes in cross-platform code. 2018-05-13 15:34:31 -04:00
Thomas Harte
0b771ce61a Removes all instances of the copyright symbol. 2018-05-13 15:19:52 -04:00
Thomas Harte
1c605d58e3 Removes the CRT requirement for an integral relationship between cycles and samples. 2018-04-16 20:00:56 -04:00
Thomas Harte
33281b9d89 Introduces S-Video as a video signal type at the interface level. 2018-03-30 10:25:41 -04:00
Thomas Harte
705d53cc21 Picks a phase for the TMS empirically. 2018-03-03 13:53:00 -05:00
Thomas Harte
ea13c7dd32 Implements multicolour mode on the TMS. 2018-03-02 23:08:01 -05:00
Thomas Harte
cabad6fc05 Optimises the inner TMS loops slightly. 2018-02-21 21:29:17 -05:00
Thomas Harte
2fe0ceb52a Sets TMS input gamma. 2018-01-13 22:19:41 -05:00
Thomas Harte
bcc7ad0c30 Corrects bad TMS sprite selections on the top row of the screen. 2018-01-06 16:26:11 -05:00
Thomas Harte
ac80d10cd8 Separates the component parts of running an audio stream: task deferral, filtering and generation. 
Walking towards improving opportunities for composition.
 2017-12-17 21:26:06 -05:00
Thomas Harte
ec4c259695 Removes unused file. 2017-12-14 21:19:09 -05:00
Thomas Harte
ad50b6b1fb Corrects TMS' get_time_until_interrupt when the next interrupt is exactly a frame away. 2017-12-14 21:12:51 -05:00
Thomas Harte
3da323c657 Corrects lingering free TMS read. 2017-12-14 20:30:56 -05:00
Thomas Harte
aca7842ca4 Better documents and tidies the TMS9918. 2017-12-14 20:27:26 -05:00
Thomas Harte
c36de4f640 Attempts real VRAM access timings, correcting a frame timing error as I go. 2017-12-13 22:37:27 -05:00
Thomas Harte
5d0c33d545 Corrects occasional TMS sprite glitching. 2017-12-12 22:19:33 -05:00
Thomas Harte
b0616ee10c Adds one-before-the-graphics as a line for video collection. 
Thereby corrects sprites on line 0.
 2017-12-12 21:35:33 -05:00
Thomas Harte
f957344ac4 Corrects TMS failure to show background through tile layer. 2017-12-09 23:15:04 -05:00
Thomas Harte
b3fbd0f352 Tidies up some of the TMS' magic constants. 2017-12-09 23:08:07 -05:00
Thomas Harte
042edc72f7 Adjusts TMS declared timing so as to be in-phase with an NTSC clock, and adopts an alternative palette. 2017-12-09 22:28:34 -05:00
Thomas Harte
943418c434 Reformulates TMS sprite plotting to set the collision flag and to support magnified sprites. 2017-12-09 20:30:12 -05:00
Thomas Harte
7d7e2538bd Introduces a computationally simplified inner loop for TMS graphics modes, modelled on that for text. 2017-12-09 16:02:33 -05:00
Thomas Harte
7a544731e2 Makes minor tidiness improvements to the TMS. 2017-12-08 22:20:21 -05:00
Thomas Harte
e1914b4f16 Attempts to add a proper intermediate buffer for sprites to allow the split of collection and output. 2017-12-08 22:12:39 -05:00
Thomas Harte
8653eb8b55 Corrects various latent errors in optimised TMS video collection. 2017-12-06 20:24:29 -05:00
Thomas Harte
a4f0a260fd Reformulates the TMS graphics mode fetch loop to try to eliminate heavy conditionality. Temporarily introduces some sprite selection issues. 2017-12-05 22:39:03 -05:00
Thomas Harte
d4a53e82bb Replaces manual retread of memcpy with standard memcpy. 2017-12-05 18:21:34 -05:00
Thomas Harte
6eedc99286 Makes substantial optimisations to text mode. 
Character optimisations to come.
 2017-12-04 22:18:51 -05:00
Thomas Harte
a473338abe Makes minor type conversion fixes. 2017-12-03 22:24:48 -05:00
Thomas Harte
ad3df36c20 Corrects sprite information collection to cover all four. 2017-12-03 14:51:55 -05:00
Thomas Harte
38b11893e8 Takes first steps towards sprite display on the TMS. 2017-12-02 22:13:43 -05:00
Thomas Harte
e4534775b0 Cleans up and zooms in on the TMS slightly. 2017-12-02 17:48:31 -05:00
Thomas Harte
fe0cdc8d69 Corrects colour fetching in TMS Graphics II to be a function of row. 2017-12-02 16:10:29 -05:00
Thomas Harte
ca26ce8400 Slightly corrects style errors in the Cartridge hierarchy, and introduces mapping of .ROM to the MSX when appropriate. 2017-12-02 16:01:30 -05:00
Thomas Harte
d3dd8f3f2a Implements screen 2 addressing. 2017-12-02 14:05:52 -05:00
Thomas Harte
3c8d2d579d Resolves remaining sources of text mode instability. 2017-11-30 22:48:07 -05:00
Thomas Harte
edcbb3dfed Tidies code a little and thereby uncovers and corrects one cause of output instability. 2017-11-30 22:19:53 -05:00
Thomas Harte
9c8158753e Makes a first attempt at displaying text mode. 2017-11-30 21:35:26 -05:00
Thomas Harte
ee84f33ab5 Ensures that the 9918 admits that it is the source of interrupts. 2017-11-29 21:33:43 -05:00
Thomas Harte
aa4eef41d8 Seeks to introduce MSX interrupts. 2017-11-29 20:31:55 -05:00
Thomas Harte
ecd7d4731b Advances emulation to showing what looks like appropriate text on screen. 2017-11-28 21:27:15 -05:00
Thomas Harte
563aa051e4 Simplifies code a little and gives something on screen. 2017-11-28 21:19:28 -05:00
Thomas Harte
642bb8333f Introduces something of a first attempt at graphics collection and display. An unsuccessful attempt. 2017-11-28 21:10:30 -05:00
Thomas Harte
c558e86e03 Adds border colour output. 2017-11-27 22:05:40 -05:00
Thomas Harte
dbb14ea2e2 Corrects counting deficiencies that could produce an unstable display. 2017-11-27 21:36:12 -05:00
Thomas Harte
173e16b107 Corrects the 9918 so that it terminates. 2017-11-27 19:48:04 -05:00
Thomas Harte
7d2adad67e Adds the absolute most basic version of in-frame time keeping, to display a white square. 2017-11-27 19:43:33 -05:00
Thomas Harte
d33612def5 Ensures the MSX provides a clock to the VDP. 2017-11-26 20:07:30 -05:00
Thomas Harte
9cb6ca3440 Adds elementary decoding of VDP accesses. 2017-11-26 20:01:11 -05:00
Thomas Harte
0eb5dd9688 Introduces the fundamentals of bus routing for the MSX. 2017-11-26 16:47:59 -05:00
Thomas Harte
a14b53a9ab Adds a TMS9918 skeleton plus enough in the MSX to get to a blank screen in SDL/kiosk mode. 2017-11-26 13:28:26 -05:00