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11,814 Commits 8 Branches 121 Tags 496 MiB
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11814 Commits

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Author SHA1 Message Date
Thomas Harte
f38bca37a2 Take another run at MEMC. 
I hadn't spotted that it is valid to map different logical pages to the same physical page with different protection levels.
 2024-03-27 10:44:40 -04:00
Thomas Harte
166793ebe6 Reduce I2C chatter. 2024-03-26 21:54:42 -04:00
Thomas Harte
8b04d0e3ef Enhance and better-document I2C states. 2024-03-26 21:52:29 -04:00
Thomas Harte
a3931674dc Seemingly navigate I2C correctly. 2024-03-26 21:33:46 -04:00
Thomas Harte
bd4ef5ec57 Switch to acknowledgement-after. 2024-03-26 14:06:11 -04:00
Thomas Harte
3ba12630ab Quieten. 2024-03-26 12:27:37 -04:00
Thomas Harte
342d90c929 Advance CMOS/I2C to a seemingly-valid read. 2024-03-26 12:24:24 -04:00
Thomas Harte
9078fc994b Try to formalise I2C events. 2024-03-25 22:10:52 -04:00
Thomas Harte
f46af4b702 OS 3.11 seems to be able to get into BASIC. 2024-03-25 22:10:35 -04:00
Thomas Harte
b112987556 Do well enough at other colour depths. 2024-03-25 22:09:55 -04:00
Thomas Harte
fc880ac130 Double down on trans mode. 2024-03-25 21:32:56 -04:00
Thomas Harte
a2d95cb982 Shuffle notes. 2024-03-25 21:31:59 -04:00
Thomas Harte
d2776071e4 Speed up debug mode. 2024-03-25 21:31:33 -04:00
Thomas Harte
72a645ec1e Fix trans; take further crack at MEMC permissions. 2024-03-25 15:50:59 -04:00
Thomas Harte
1154ffd072 Add a 'drive in use' indicator LED. 2024-03-25 15:03:54 -04:00
Thomas Harte
8ba9708942 Hopefully resolve the mystery of the latch writes. 2024-03-25 14:54:30 -04:00
Thomas Harte
521fca6089 Expose full bus to IOC dependents; add notes. 2024-03-25 11:07:44 -04:00
Thomas Harte
ae684edbe1 Formally decode bank/offset/type. 2024-03-25 10:16:36 -04:00
Thomas Harte
fa0a9aa611 Eliminate 'has_moved_rom_'. 2024-03-24 22:36:11 -04:00
Thomas Harte
5da9e0486a Simplify control flow. 2024-03-24 22:30:26 -04:00
Thomas Harte
6980fd760c Add further heavily-manual debugging aids. 2024-03-24 22:18:30 -04:00
Thomas Harte
3549488b7a Add round-trip test for status flags. 2024-03-24 22:18:16 -04:00
Thomas Harte
c1602cc8fe The keyboard and interrupts are currently trusted. 2024-03-23 21:49:52 -04:00
Thomas Harte
189dd176de Reguess state machine, fixing startup display. 2024-03-23 21:38:35 -04:00
Thomas Harte
3cf262d1f7 Improve terminology, add more documentation. 2024-03-23 21:12:01 -04:00
Thomas Harte
ccfc389274 Quieten where now confident. 2024-03-23 21:03:06 -04:00
Thomas Harte
0e07f802ac Use BACK state; accept other ACKs at any time. 2024-03-23 21:02:35 -04:00
Thomas Harte
55f92e2411 Adjust data abort address. 2024-03-23 20:31:47 -04:00
Thomas Harte
c720f3910a Avoid implicit sign cast. 2024-03-23 20:13:25 -04:00
Thomas Harte
4215edd11b Reduce noise. 2024-03-23 20:12:56 -04:00
Thomas Harte
09a61cf1a7 Don't expect an ACK after identifying. 2024-03-23 20:12:38 -04:00
Thomas Harte
5967ad0865 Sketch out whole protocol, albeit faulty. 2024-03-23 17:08:03 -04:00
Thomas Harte
eb34c38332 Add very faulty key input. 2024-03-23 15:58:48 -04:00
Thomas Harte
5ccb18225a Provide key states to the keyboard. 2024-03-23 15:43:04 -04:00
Thomas Harte
58bbce1a15 Avoid display errors upon back-pressure. 2024-03-22 22:01:12 -04:00
Thomas Harte
9ea3e547ee Fix IRQ/FIQ return addresses. 2024-03-22 21:42:34 -04:00
Thomas Harte
fb5fdc9f10 Actually apply video divider. 2024-03-22 10:24:24 -04:00
Thomas Harte
de7b7818f4 Add 4bpp output. 2024-03-22 10:18:25 -04:00
Thomas Harte
c4e6b18294 Manage pixel buffers. 2024-03-22 10:10:13 -04:00
Thomas Harte
ae6cf69449 Move responsibility for clock division; reinstate vsync interrupt. 2024-03-22 10:01:34 -04:00
Thomas Harte
4a2dcff028 Endeavour to map colours properly. 2024-03-21 21:53:50 -04:00
Thomas Harte
aa6acec8fa Don't hoard cycles per line value. 2024-03-21 21:47:27 -04:00
Thomas Harte
4ac4da908c Reduce TODOs, do _something_ with border colour. 2024-03-21 21:40:11 -04:00
Thomas Harte
66e62857c4 Give ostensibly clean timing to the CRT. 2024-03-21 21:29:53 -04:00
Thomas Harte
bbc0d8b050 Count time in phase correctly. 2024-03-21 21:15:25 -04:00
Thomas Harte
0f8bc416d1 Make first, faulty step into displaying a field. 2024-03-21 21:10:55 -04:00
Thomas Harte
2ec235170e Finish the thought on magic constants. 2024-03-21 20:45:17 -04:00
Thomas Harte
2de1a2dd0d Install and properly clock a CRT. 2024-03-21 20:41:24 -04:00
Thomas Harte
1f49c3b113 Give sound and video somewhere to read from. 2024-03-21 20:22:20 -04:00
Thomas Harte
5c645fb3c2 Switch to a fixed output clock; retain addresses. 2024-03-21 11:51:29 -04:00