Thomas Harte
96bf133924
Withdraws requirement for DiskController users to specify a PLL multiplier or to provide rotation speed.
...
In the latter case because it's no longer of any interest to the controller, and in the former because I'd rather it be picked automatically.
2017-09-10 22:56:05 -04:00
Thomas Harte
0622187ddf
Strips Controller of all capabilities now housed on the Drive.
2017-09-10 19:23:23 -04:00
Thomas Harte
73080d6c36
Added an easy way for disk controllers to clamp termination of written data exactly to the index hole.
...
This commit also temporarily provides a whole load of extra logging and minor logic improvements from the 8272. I'm mid-flow on finding a particularly vicious error in its handling of writing; wait for the pull request. But, at least: now waits for the first part of a post-ID gap before writing data, and attempts partially to handle appearance of the index hole during writing a track. More work to do on that though.
2017-08-15 16:05:10 -04:00
Thomas Harte
cddcd0fb79
Put my money where my mouth is and switched the superclass of WD1770 to MFMController, eliminating duplicated (/factored out) code.
2017-08-14 16:32:53 -04:00
Thomas Harte
34eaf75352
Fixed WAIT_FOR_TIME macro.
2017-08-06 12:08:54 -04:00
Thomas Harte
4abd62e62b
Standardises on const [Half]Cycles as the thing called and returned, rather than const [Half]Cycles & as it's explicitly defined to be only one int in size, so using a reference is overly weighty.
2017-07-27 22:05:29 -04:00
Thomas Harte
a1e9a54765
Eliminated redundant uses of ClockReceiver and sought to ensure that proper run_fors are inherited all the way down.
2017-07-25 20:09:13 -04:00
Thomas Harte
8a2bdb8d22
Converted the TimedEventLoop and the things that sit atop it into ClockReceivers.
2017-07-24 21:19:05 -04:00
Thomas Harte
8755824c64
Added some documentation.
2017-07-22 17:25:53 -04:00
Thomas Harte
64865b3f41
Signedness fixes.
2017-07-21 21:23:34 -04:00
Thomas Harte
53f0e1896b
Made delay_time_ unsigned for safe comparison.
2017-07-21 21:21:23 -04:00
Thomas Harte
e01f3f06c8
Completed curly bracket movement.
2017-03-26 14:34:47 -04:00
Thomas Harte
eca3995481
Added a CRC check for read address, ensured CRC, lost data and record not found are initially reset.
2017-01-01 21:00:25 -05:00
Thomas Harte
044c920a5b
Made it more explicit that there are no unhandled cases.
2017-01-01 20:56:52 -05:00
Thomas Harte
0df9ce5a76
Made an attempt at read address. So superficially that leaves only the force interrupts.
2017-01-01 20:55:09 -05:00
Thomas Harte
f94f34f053
Made an attempt at read track. Which means process_input_bit can't just swallow syncs any more; it now reports them as tokens of type ::Sync.
2017-01-01 20:39:19 -05:00
Thomas Harte
c994fa39f6
Ensured spin-up doesn't occur if there's no motor line.
2016-12-31 16:18:30 -05:00
Thomas Harte
1ea4f0d79d
Made an attempt to implement 'write track' and ensure that 'write sector' can't end without announcing that it has ended writing.
2016-12-31 16:01:44 -05:00
Thomas Harte
8eb21c6702
The "MFM...Byte"s aren't MFM-specific, they're relevant to both FM and MFM encoding. So renamed them. Also slimmed syntax within MFM.cpp mostly where emigration from the Acorn disk analyser had left a residue of lengthy namespace specification.
2016-12-31 15:25:11 -05:00
Thomas Harte
a8bc9d830e
Removed leftover very temporary debugging aid.
2016-12-28 23:03:05 -05:00
Thomas Harte
e4000bd060
Added some even more verbose logging; slightly simplified write loop logic, and decided it's definitely write_byte that's responsible for CRC generator feeding.
2016-12-28 21:24:19 -05:00
Thomas Harte
4adcb46665
Fixed FM-mode CRC generation.
2016-12-28 19:51:27 -05:00
Thomas Harte
1277a67f9a
Introduced data_mode_ to replace is_reading_data_, representing that there are now three possible modes. When writing, any input from the read head won't affect the CRC generator.
2016-12-28 19:26:21 -05:00
Thomas Harte
7a627b782d
Reintroduced writing of MFM sync marks when writing a sector.
2016-12-28 18:48:50 -05:00
Thomas Harte
a568172758
Made steps towards proper CRC generation. Am currently comparing against Oric disk images, as — amongst other things — they include precomputed CRCs.
2016-12-28 18:29:37 -05:00
Thomas Harte
9c0f622a2e
Started working CRC checking into the 1770. Discovered immediately that my generated CRC does not match that built into the Oric disk images. So mine is pretty-much certainly wrong. An opportunity for learning!
2016-12-26 16:46:26 -05:00
Thomas Harte
0490a47058
Worked on the all-around framework for decoding sectors back from tracks when closing down a file. Hit the wall that the parser is more observant of CRCs than the WD. No, really. So I guess I have to stop avoiding that whole issue.
2016-12-26 14:24:33 -05:00
Thomas Harte
83c433c142
Deviated from the data sheet, which seems likely to be correct. Hence removed a whole load of the temporary logging.
2016-12-26 12:48:49 -05:00
Thomas Harte
742c5df367
With lots of logging arising temporarily, fixed bug whereby conversion to a patched track would lead to holding a track with a distinct measure of time, leading to improperly-placed patches.
2016-12-25 22:00:39 -05:00
Thomas Harte
acc35885cd
Attempted to reduce track invalidations.
2016-12-25 20:38:25 -05:00
Thomas Harte
c0a1264ab0
Slightly improved legibility.
2016-12-25 20:19:47 -05:00
Thomas Harte
e2b829f68e
Made an attempt to write the proper address mark.
2016-12-25 20:15:07 -05:00
Thomas Harte
beaa868079
Factored the MFM parser out into encodings.
2016-12-25 20:00:57 -05:00
Thomas Harte
74e98fd097
Made an attempt to write actual data (albeit that CRC calculation is still missing).
2016-12-25 19:18:45 -05:00
Thomas Harte
98be6ede45
Shuffled a little to reduce risk of overflow, ensured writing is a loop, still seem to be writing too quickly for some reason.
2016-12-25 16:13:05 -05:00
Thomas Harte
d2ad2c756e
Added enough shovelling to write rubbish for an entire sector.
2016-12-25 15:46:49 -05:00
Thomas Harte
aceb7e3b6b
Started implementing write sector on the 1770, immediately deciding it would be useful to have a callback for end-of-queued-data-written from disk controller. So had a go at implementing that, naively. More investigation required.
2016-12-25 12:31:38 -05:00
Thomas Harte
901f19f89c
Added enough stuff that SSDs attached to a 1770 will now reach the entry point for writing.
2016-12-25 09:46:12 -05:00
Thomas Harte
c304db0f5a
Deintegrated the busy flag and the interrupt request line, as the latter is reset by status reads. Which also means I can start reporting the WD INTRQ line status directly from the Microdisc. That appears to be correct, rather than honouring the Microdisc IRQ select there.
2016-12-06 21:16:29 -05:00
Thomas Harte
81ee834530
As well as a bunch of logging, reinstated rotation position preservation across tracks.
2016-12-02 18:36:47 -05:00
Thomas Harte
93c573bfa9
Implemented missing status bits (other than the index hole), and a head loading delay for the Microdisc.
2016-12-01 21:13:16 -05:00
Thomas Harte
0a0775c3bd
Removed earlier hacky solution.
2016-12-01 20:16:11 -05:00
Thomas Harte
442986ee2c
Introduced a head loading path for 1793 machines.
2016-12-01 20:12:22 -05:00
Thomas Harte
82899f2f47
Ensured flag setting is atomic, removed duplication of interrupt request versus busy, found better names for the personality testers, unified delegate protocol.
2016-12-01 07:41:52 -05:00
Thomas Harte
b31fd11470
Fixed reporting of data request line, initial status values.
2016-11-30 22:39:55 -05:00
Thomas Harte
2222cb65d6
Split the status up into flags, assembled into a register upon demand. Attempted to implement some of the differences between the 1770/1772 and 1773/1793. Albeit with a motor fix still in place.
2016-11-30 22:26:02 -05:00
Thomas Harte
84cb07613d
Checked some documentation more thoroughly; the 1793 has quite different spin-up (/head load) semantics. So it's another distinct personality. Grrr.
2016-11-27 20:39:08 -08:00
Thomas Harte
02ba1f220f
The '72 seems to be a '70 with altered timing. So worth differentiating.
2016-11-27 21:06:17 +08:00
Thomas Harte
2c01f9dbed
Added meaningful TODOs.
2016-11-27 08:42:39 +08:00
Thomas Harte
2f459690d4
It would appear the 1770 and 1773 actually differ in relation to the (non-sensical) ability not to spin-up for a Type 2, and whether a side compare can occur. So the WD1770 class now requires a personality to be specified. Which it singly fails to honour.
2016-11-26 23:29:30 +08:00
Thomas Harte
d8ecc52de8
Temporarily disabled spin-down as harmful to the status register if following anything other than a Type 1 command.
2016-11-26 22:27:20 +08:00
Thomas Harte
b9677c9927
Consolidated interrupt request setting.
2016-11-26 09:41:53 +08:00
Thomas Harte
d5f9e0aa3b
Ensured there's no such thing as a zero-cycle operation, even if i don't yet know exactly what I should be doing.
2016-11-25 21:24:25 +08:00
Thomas Harte
4af678d2ed
Gave the Microdisc a clock signal, added just enough of force interrupt to avoid a spurious belief that a type 3 command has started.
2016-11-25 20:51:39 +08:00
Thomas Harte
d4a1961378
Added getters for the IRQ and DRQ lines plus a delegate to receive changes; adjusted code so that the two lines signal.
2016-11-21 13:21:49 +08:00
Thomas Harte
79412dc84d
Upped MFM clock cycles, switched back to using the typer for the ADFS and adjusted ADFS ROM slots.
2016-09-28 21:28:34 -04:00
Thomas Harte
91235c7fd7
Fixed issue whereby parts of data that merely looked like index or ID address marks within tracks caused a resynchronisation of the tokeniser.
2016-09-27 07:36:37 -04:00
Thomas Harte
6330e5706c
Fixed seek verify. First ADFS directory is visible.
2016-09-25 21:44:46 -04:00
Thomas Harte
4db086949a
Made an attempt to add MFM decoding to the 1770; ensured something is returned when reading the Plus 3 status register again.
2016-09-25 21:38:52 -04:00
Thomas Harte
572d5587d9
Made a first stab at enabling multi-disk machines and thereby obeying (some of) the Plus 3's status register.
2016-09-25 21:24:16 -04:00
Thomas Harte
9bbcbd1001
Renamed class, intending to turn a Disk::Drive into literally just that, and have a thing with a PLL that consumes events be a Controller.
2016-09-25 20:05:56 -04:00
Thomas Harte
6084020ab3
Added shift-break as a better way to boot suitable disks. Continued attempting to clean the 1770.
2016-09-25 14:11:22 -04:00
Thomas Harte
a538b45213
Sought to implement the verify step of type 1 commands.
2016-09-25 09:54:49 -04:00
Thomas Harte
0918751802
Fixed stepping out.
2016-09-24 22:48:45 -04:00
Thomas Harte
9e1d4c8b01
Fixed an initial setup error with seek.
2016-09-24 22:43:12 -04:00
Thomas Harte
d50629e6aa
This is clearly the winning solution. Edited down.
2016-09-24 22:36:38 -04:00
Thomas Harte
07ff5138b7
The catalogue now loads.
2016-09-24 22:35:34 -04:00
Thomas Harte
1b69ad0fd4
This attempts to implment sector reading. DFS reports an error.
2016-09-24 22:29:02 -04:00
Thomas Harte
ce4100e5b9
Fixed slots for DFS and ADFS to sideways RAM; continued working on the 1770 to get as far as trying to get the body of a sector.
2016-09-24 22:04:54 -04:00
Thomas Harte
7154e8986e
Fixed stepping delay.
2016-09-24 20:16:23 -04:00
Thomas Harte
53522e28e2
Performed an about-face on how this should probably be implemented. Now forsaking the state machine in favour of a macro'd switch-for-cooperative-event-based-messaging implementation. Let's see how this ends up looking.
2016-09-24 20:12:45 -04:00
Thomas Harte
88bbeedad3
Set actual bit length.
2016-09-22 21:28:23 -04:00
Thomas Harte
75eb62b577
One painful step at a time, this now starts the disk rotating and gets as far as deciding whether it's about to head off on a read or a write.
2016-09-22 21:25:31 -04:00
Thomas Harte
8db0030068
Fixed ROM loading by the Electron, turned the WD1770 into a 'disk drive' (it'll do for now), persuaded it to get all the way through a very specifically convenient type 1 command.
2016-09-20 22:14:33 -04:00
Thomas Harte
7a34ae0da6
This is the start of my slog through type 1 commands. I kind of need to figure out what I'm doing about drives and PLLs now though.
2016-09-20 16:58:23 -04:00
Thomas Harte
3b97b038b9
Corrected and sketched out state machine far enough to get to a complaint about unhandled work.
2016-09-20 15:56:31 -04:00
Thomas Harte
a9e65e9b7a
Tweaked disk side density, added call-outs to a WD1770 if the Electron had one (albeit without run_for_cycles yet as I need to figure out the clock rate), added a shell of the basic functions of the WD1770. No implementation yet.
2016-09-19 22:06:56 -04:00
Thomas Harte
bcf91de7e9
Declared support for the Acorn disk files, started hammering out an encoder.
2016-09-18 13:35:54 -04:00
Thomas Harte
e3daf80564
Added a file for the 1770, at least.
2016-09-17 18:01:00 -04:00
