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Commit Graph

87 Commits

Author SHA1 Message Date
Thomas Harte
bc10b3ee9a It appears the problem is as simple as sectors being counted from zero. 2016-08-01 10:08:38 -04:00
Thomas Harte
f5e4ea3351 Some minor tidying, lots more of the caveman stuff as I try to determine what I'm doing wrong. 2016-08-01 09:43:08 -04:00
Thomas Harte
18744cd98b Slightly updated comments, switched to 1540 ROM so as very slightly to improve loading time. 2016-08-01 04:37:30 -04:00
Thomas Harte
b43a7381ae Fixed framing and first-byte-after-sync signalling. Hacked together as parts of it are, loading now appears to work! 2016-08-01 04:25:11 -04:00
Thomas Harte
41893b5ef6 Put in the absolute minimum logic for drive motor emulation. Drive appears to be attempting head steps. 2016-07-31 19:38:51 -04:00
Thomas Harte
740ea0b7e2 Added overflow-flag setting logic and ensured disk ROM gets through regardless of ROM/disk installation order. 2016-07-31 19:33:18 -04:00
Thomas Harte
0945049cd3 Made attempt to connect sync detect and then apply appropriate windowing, posting bytes to the appropriate place. 2016-07-31 18:29:44 -04:00
Thomas Harte
198fbbedc7 Reeled back all appropriate pieces of caveman debugging. 2016-07-31 13:42:34 -04:00
Thomas Harte
2332f72875 Formalised clock-rate multiplication within disk drives, discovered that the stepper didn't have ideal behaviour for my timed event loop and hence nailed down the semantics a ilttle more.
(obiter: the 1540 now appears to discern the correct sequence of bits. Framing is off in my test printfs but that's neither here nor there).
2016-07-31 13:32:30 -04:00
Thomas Harte
8f62211f5e Wired up the 1540 as a PLL delegate. Which prima facie means it should start receiving a bit stream. Except that I clearly have something in the timing way off — either my flux transitions are far too short or I need to significantly increase the clock rate on the PLL. 2016-07-29 12:08:18 -04:00
Thomas Harte
89a1881fef Started turning the 1540 into an actual disk drive. 2016-07-29 11:03:09 -04:00
Thomas Harte
ada2f073e0 Completed handing of the disk all the way to the 1540. 2016-07-10 16:24:46 -04:00
Thomas Harte
824d9ea92b Added further comments. 2016-07-10 08:01:16 -04:00
Thomas Harte
d8334edf4a Started trying to clean up, including commuting the C1540 source file name to match its class name but mainly by adding documentation. 2016-07-10 07:46:20 -04:00
Thomas Harte
c0ab45a73d Disabled a bunch of the caveman debug logging. 2016-07-09 22:29:11 -04:00
Thomas Harte
f589d639db Okay, so it seems that sync also works the other way around. 2016-07-09 22:25:44 -04:00
Thomas Harte
693c8b2438 After all that, it seems likely that inputs just aren't inverted for the Vic. 2016-07-09 20:03:38 -04:00
Thomas Harte
656cd211d7 Was transmitting bit levels backwards (probably?); 1540 now acknowledges byte received. 2016-07-09 18:06:49 -04:00
Thomas Harte
7cc4bf3fe7 Hit and hope is getting me nowhere. Time to unit test this thing. 2016-07-09 15:40:25 -04:00
Thomas Harte
8827597363 Messier and messier, but I've at least attempted to implement hardware attention acknowledge. 2016-07-08 19:00:39 -04:00
Thomas Harte
9a08ef61cb Still fumbling in the margins: made an effort not to imply that the 1540 is forever reading syncs. 2016-07-07 22:13:18 -04:00
Thomas Harte
199c0e27e0 Mostly just random guesses now, to be honest. It's approaching the end of my window for the morning. 2016-07-07 07:16:36 -04:00
Thomas Harte
c9479f923b The inversion of truth was clearly just a problematic API. Got explicit. LineLevel might need to become more pervasive. 2016-07-07 06:44:13 -04:00
Thomas Harte
dcb86a027a Okay, so the 1540 doesn't toggle the actual attention line. I don't know what it does yet but this helps. 2016-07-06 22:31:14 -04:00
Thomas Harte
1baf21827c Since the ROM is well disassembled, let's actually try to be a 1541 first. 2016-07-06 22:17:32 -04:00
Thomas Harte
f64cd8cfcb Quick fixes properly to declare the DriveVIA, to ensure its interrupts take effect, and to wire ATN IN to CA1 rather than CB2. 2016-07-06 20:22:46 -04:00
Thomas Harte
428fcdb978 Centralised and improved serial logging. 2016-07-06 07:46:21 -04:00
Thomas Harte
8819711bc8 Threw in the second VIA as a currently clearly incorrect thing. 2016-07-05 22:22:09 -04:00
Thomas Harte
93c2bb80a2 Improved a comment, added independent C[A/B]2 input mode. 2016-07-05 21:11:51 -04:00
Thomas Harte
6c4fa4ec5d Improved commenting and initial state communication. 2016-07-05 20:57:31 -04:00
Thomas Harte
1e6d90de17 Made an attempt properly to deal with initial bus state. 2016-07-05 20:52:33 -04:00
Thomas Harte
c3b7d24293 It appears that the attention line is also wired to CB2. So the ball is back in the 6522's court. 2016-07-05 19:19:46 -04:00
Thomas Harte
11fc43aa04 Made an attempt to allow the 1540 to talk back to the Vic, and to receive interrupts. Also slightly disambiguated debugging logging. 2016-07-05 19:12:43 -04:00
Thomas Harte
d16b79073e Further fleshing out: added a serial port for the serial bus. 2016-07-05 17:27:02 -04:00
Thomas Harte
d1eea6943d Ensured the 1540 ROM gets installed, at least. 2016-07-05 16:54:25 -04:00
Thomas Harte
86dabd007b Furthered fleshing out of the 1540. Though it doesn't yet receive a ROM so won't even attempt to do anything meaningful. 2016-07-05 16:39:18 -04:00
Thomas Harte
0d3d0fbe4d Created a namespace for Commodore and an empty container file for the 1540[/1] implementation. 2016-07-05 13:28:27 -04:00