Thomas Harte
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3ef2715eee
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Implements the ROM version of fast loading.
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2021-03-22 19:04:38 -04:00 |
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Thomas Harte
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4a12d7086d
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Makes another guess at total colour phase.
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2021-03-22 17:24:38 -04:00 |
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Thomas Harte
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a6b75b8637
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Attempts improvements to video fetch timing. Alas, a lot of guess work here.
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2021-03-22 15:59:03 -04:00 |
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Thomas Harte
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bdb3bce8d6
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Corrects semantics on contended-timing calculation.
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2021-03-22 15:48:51 -04:00 |
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Thomas Harte
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a26716919c
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Switches to an is-in-video test that allows for video memory being paged twice.
This is trivially possible even in plain 128kb mode.
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2021-03-22 15:46:02 -04:00 |
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Thomas Harte
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8dbc7649aa
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Adds note-to-self re: FDC.
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2021-03-22 09:15:00 -04:00 |
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Thomas Harte
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42a9dc7c2b
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Minimises video flushing, moves it to the proper time.
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2021-03-22 09:02:49 -04:00 |
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Thomas Harte
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7965772745
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Moves contention delays up to the time of MREQ going active.
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2021-03-21 23:04:20 -04:00 |
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Thomas Harte
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7562917740
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Adds the Spectrum to the macOS New... menu.
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2021-03-21 21:50:50 -04:00 |
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Thomas Harte
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3925eee575
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Attempts more relaxed decoding of AY accesses.
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2021-03-21 21:03:35 -04:00 |
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Thomas Harte
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6482303063
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Reduces code duplication slightly.
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2021-03-21 20:34:58 -04:00 |
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Thomas Harte
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9ce1dbaebb
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Switches to partial decoding for paging registers; permits video address changes after paging is locked.
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2021-03-21 20:23:00 -04:00 |
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Thomas Harte
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064667c0c3
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Corrects asymmetrical flash, ensures consistent burst phase.
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2021-03-21 20:22:27 -04:00 |
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Thomas Harte
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58be770eaa
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Factors out some boilerplate.
When I'm confident this is correct, I can fix up the other call sites.
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2021-03-21 00:14:48 -04:00 |
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Thomas Harte
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1b0f45649e
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Improves contended timing.
Still not quite on the money, but this was an overt bug.
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2021-03-21 00:00:18 -04:00 |
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Thomas Harte
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42bfabbe8c
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The implication seems to be of a fixed phase swing.
I'm enquiring further.
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2021-03-20 23:46:13 -04:00 |
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Thomas Harte
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07a63d62dd
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Adds some quick arithmetic on the clock speed.
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2021-03-20 11:19:44 -04:00 |
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Thomas Harte
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26911a16e8
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Lengthens sync, better to conform to PAL; experiments with fixed-phase colour burst.
I need to get hold of real documentation here.
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2021-03-20 10:38:21 -04:00 |
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Thomas Harte
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cf9a5d595b
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Completes piping of audio.
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2021-03-19 23:33:46 -04:00 |
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Thomas Harte
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7729f1f3d0
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Attempts automatic Spectrum tape control.
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2021-03-19 22:43:48 -04:00 |
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Thomas Harte
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7d59ff6d8f
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Builds in a colour burst, producing colour composite.
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2021-03-19 22:25:37 -04:00 |
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Thomas Harte
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2ee478b4c4
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Goes some way towards wiring up Spectrum options.
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2021-03-19 22:17:20 -04:00 |
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Thomas Harte
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a482ce1546
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Adds a tape player.
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2021-03-19 11:12:50 -04:00 |
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Thomas Harte
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2371048ad1
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Formally separates keyboard code.
With an eye to formalising the Spectrum/ZX81/ZX80 differences.
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2021-03-19 10:36:08 -04:00 |
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Thomas Harte
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93b9ea67e6
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Takes a run at contended timings.
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2021-03-19 08:49:56 -04:00 |
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Thomas Harte
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87fac15cc4
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This is going to remain purely a template; no .cpp.
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2021-03-18 23:51:45 -04:00 |
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Thomas Harte
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2d51924a3c
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Wires up Spectrum keyboard.
The machine now appears to be fully interactive and functional. Timing and media aside, that is.
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2021-03-18 23:51:21 -04:00 |
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Thomas Harte
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44240773ef
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Corrects address generation, ink/paper selection.
Seemingly to give a correct +2a boot. Time to add a keyboard and find out, I guess.
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2021-03-18 23:30:48 -04:00 |
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Thomas Harte
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ed587a4db5
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Provides a better no-port-here value.
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2021-03-18 23:14:39 -04:00 |
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Thomas Harte
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020a04006e
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Adds flashing, randomises initial RAM contents.
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2021-03-18 23:07:51 -04:00 |
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Thomas Harte
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622a8abf7f
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Takes a stab at pixel output.
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2021-03-18 22:57:10 -04:00 |
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Thomas Harte
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871bac6c8a
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Marks out and approximately centres a pixel region.
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2021-03-18 22:41:20 -04:00 |
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Thomas Harte
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fe3e8f87e7
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Takes a shot at an all-border output.
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2021-03-18 22:29:24 -04:00 |
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Thomas Harte
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87fc7c02e8
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Provides a base pointer for video output.
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2021-03-18 22:04:41 -04:00 |
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Thomas Harte
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f2620e6afb
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Adds a CRT. Not yet clocked.
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2021-03-18 21:54:42 -04:00 |
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Thomas Harte
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ab2ad70885
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Takes a run at interrupts.
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2021-03-18 21:29:52 -04:00 |
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Thomas Harte
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135134acfd
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Adds a shell for video emulation.
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2021-03-18 12:47:48 -04:00 |
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Thomas Harte
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5664e81d48
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It appears the +2a and +3 have a different clock rate.
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2021-03-18 12:41:24 -04:00 |
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Thomas Harte
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b830d62850
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Adds quick notes on port FE.
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2021-03-18 12:32:54 -04:00 |
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Thomas Harte
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17f551e89d
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Attempts a full audio wiring.
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2021-03-18 12:23:54 -04:00 |
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Thomas Harte
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4a4da90d56
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Implements some of the memory map, and instantiates audio objects.
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2021-03-18 12:14:48 -04:00 |
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Thomas Harte
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730bfcd1fd
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Stumbles towards a memory map.
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2021-03-18 10:43:51 -04:00 |
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Thomas Harte
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97249b0edd
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Slow walks further towards a functioning Spectrum.
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2021-03-18 10:18:17 -04:00 |
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Thomas Harte
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5a1bda1d82
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Performs boilerplate towards a ZX Spectrum class.
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2021-03-17 23:38:55 -04:00 |
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