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Code Issues Projects Releases Wiki Activity
10,759 Commits 10 Branches 121 Tags 498 MiB
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Commit Graph

49 Commits

Author SHA1 Message Date
Thomas Harte
8efb6a9226 Simplify 'get_next_sequence_point' -> 'next_sequence_point'. 2023-09-10 18:00:49 -04:00
Thomas Harte
2b56b7be0d Simplify namespace syntax. 2023-05-10 16:02:18 -05:00
Thomas Harte
708c24cc57 This field is counted in half-cycles. 2021-04-26 21:20:32 -04:00
Thomas Harte
b7a62e0121 Adds SZX support. 
Tweaking exposed Spectrum state object as relevant.
 2021-04-26 20:47:28 -04:00
Thomas Harte
700c505974 Ensures the ZX Spectrum properly reports its display type. 2021-04-25 21:16:22 -04:00
Thomas Harte
d403036d86 Reduce bounce at Spectrum startup. 2021-04-25 20:56:57 -04:00
Thomas Harte
2510064218 Completes state object. 
Subject to not yet dealing with last_fetches_ and last_contended_access_ correctly. Thought required.
 2021-04-25 14:20:40 -04:00
Thomas Harte
0ef2806970 Adds just enough to ensure that border state gets through. 2021-04-25 14:16:35 -04:00
Thomas Harte
fd271d920b Adds capture and forwarding of border colour. 2021-04-25 14:00:12 -04:00
Thomas Harte
37dcf61130 Add timing tests, fix +3 discrepancy. 2021-04-23 22:29:57 -04:00
Thomas Harte
9731fdd33b Moves horizontal sync on the 48kb. 2021-04-21 19:46:44 -04:00
Thomas Harte
d0c789ff9a Locks declarative form of contention closer to regular expressions. 2021-04-21 19:37:36 -04:00
Thomas Harte
9baa861742 Simplifies timing calculation expression. 2021-04-21 19:18:07 -04:00
Thomas Harte
704737144a Corrects all interrupt timing for sign and off-by-one errors. 2021-04-18 18:40:44 -04:00
Thomas Harte
93422f4b1c Brings timings into line with WoS specs. 2021-04-16 22:40:51 -04:00
Thomas Harte
d7954a4cb1 Tweaks timing a little. 2021-04-15 21:51:49 -04:00
Thomas Harte
fa18b06dbf Correct get_floating_value to be consistent in out-of-bounds behaviour. 2021-04-15 21:13:36 -04:00
Thomas Harte
71cf63bd35 Corrects internal cycle contention. 2021-04-15 19:17:11 -04:00
Thomas Harte
f10ec80153 Gets started on different video timings. 2021-04-14 22:23:27 -04:00
Thomas Harte
0af405aa46 Starts working in the 48kb and 128kb Spectrums. 2021-04-14 21:37:10 -04:00
Thomas Harte
60e8273de2 Tweaks video timing, again. 2021-04-06 21:04:54 -04:00
Thomas Harte
1da51bee6c 14368 and six seem to be the proper numbers, per my comprehension of Patrick Rak. 2021-04-04 19:52:19 -04:00
Thomas Harte
044ac949ba Rearrange fields. 2021-04-01 12:44:00 -04:00
Thomas Harte
87317f5673 Improve documentation, pin down read/write times. 2021-04-01 12:38:58 -04:00
Thomas Harte
4f80523828 Tweaks contended timing. 2021-03-31 22:51:20 -04:00
Thomas Harte
465ecc4a78 Attempts to implement proper floating bus behaviour. 
As per http://sky.relative-path.com/zx/floating_bus.html
 2021-03-24 20:23:33 -04:00
Thomas Harte
0ac11fc39e Add floating bus. 2021-03-23 17:09:42 -04:00
Thomas Harte
d0776b58cf Tweaks timing empirically. 2021-03-22 23:20:49 -04:00
Thomas Harte
60e77785e8 Makes an attempt to provide the necessary hook for floating bus behaviour. 2021-03-22 22:34:28 -04:00
Thomas Harte
19cd6a55d3 Rejigs the way video is counted to orient it around fetch times. 2021-03-22 22:18:38 -04:00
Thomas Harte
4a12d7086d Makes another guess at total colour phase. 2021-03-22 17:24:38 -04:00
Thomas Harte
a6b75b8637 Attempts improvements to video fetch timing. Alas, a lot of guess work here. 2021-03-22 15:59:03 -04:00
Thomas Harte
bdb3bce8d6 Corrects semantics on contended-timing calculation. 2021-03-22 15:48:51 -04:00
Thomas Harte
6482303063 Reduces code duplication slightly. 2021-03-21 20:34:58 -04:00
Thomas Harte
064667c0c3 Corrects asymmetrical flash, ensures consistent burst phase. 2021-03-21 20:22:27 -04:00
Thomas Harte
1b0f45649e Improves contended timing. 
Still not quite on the money, but this was an overt bug.
 2021-03-21 00:00:18 -04:00
Thomas Harte
42bfabbe8c The implication seems to be of a fixed phase swing. 
I'm enquiring further.
 2021-03-20 23:46:13 -04:00
Thomas Harte
26911a16e8 Lengthens sync, better to conform to PAL; experiments with fixed-phase colour burst. 
I need to get hold of real documentation here.
 2021-03-20 10:38:21 -04:00
Thomas Harte
7d59ff6d8f Builds in a colour burst, producing colour composite. 2021-03-19 22:25:37 -04:00
Thomas Harte
93b9ea67e6 Takes a run at contended timings. 2021-03-19 08:49:56 -04:00
Thomas Harte
44240773ef Corrects address generation, ink/paper selection. 
Seemingly to give a correct +2a boot. Time to add a keyboard and find out, I guess.
 2021-03-18 23:30:48 -04:00
Thomas Harte
020a04006e Adds flashing, randomises initial RAM contents. 2021-03-18 23:07:51 -04:00
Thomas Harte
622a8abf7f Takes a stab at pixel output. 2021-03-18 22:57:10 -04:00
Thomas Harte
871bac6c8a Marks out and approximately centres a pixel region. 2021-03-18 22:41:20 -04:00
Thomas Harte
fe3e8f87e7 Takes a shot at an all-border output. 2021-03-18 22:29:24 -04:00
Thomas Harte
87fc7c02e8 Provides a base pointer for video output. 2021-03-18 22:04:41 -04:00
Thomas Harte
f2620e6afb Adds a CRT. Not yet clocked. 2021-03-18 21:54:42 -04:00
Thomas Harte
ab2ad70885 Takes a run at interrupts. 2021-03-18 21:29:52 -04:00
Thomas Harte
135134acfd Adds a shell for video emulation. 2021-03-18 12:47:48 -04:00