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
