149 Commits

Author	SHA1	Message	Date
Thomas Harte	e559a65ede	Ideally I would be able to kill this multiplier, as it could easily be derived at runtime. But, for now, just turned it up so that the analysis-oriented parser is better at parsing different bit rates.	2017-08-18 15:47:46 -04:00
Thomas Harte	0c1714b695	Relaxed a little to allow +10% in track length.	2017-08-17 21:36:14 -04:00
Thomas Harte	4f8b89772e	Improved logic for detecting when all sense has been derived from a track to spot any repeated track, not necessarily the first one. That avoids sectors that run over the index hold and obscure the first throwing things.	2017-08-17 15:31:53 -04:00
Thomas Harte	fedf5a44a6	Imposes a maximum track length.	2017-08-17 15:20:49 -04:00
Thomas Harte	1011143dbe	Sought to correct my interpretation of 'gap 3'.	2017-08-13 21:52:48 -04:00
Thomas Harte	0c8769e335	Just to be safe.	2017-08-11 18:41:08 -04:00
Thomas Harte	83c7d34df2	Switched to populating the sector cache with everything in a track the first time anything on that track is requested. That avoids the problem whereby each request of a non-existent sector costs two spins.	2017-08-11 18:40:16 -04:00
Thomas Harte	a12671010a	Sector size is now reported, and CRC failures are merely indicated, not cause for a sector to be thrown away.	2017-08-11 16:23:33 -04:00
Thomas Harte	cf1403bc79	Increased documentation.	2017-08-11 14:27:07 -04:00
Thomas Harte	fcf63a7547	Expands the [M]FM encoder to respect some new Sector flags: it will now wilfully make CRC errors, omit data, include data that is different than the ID's declared length, write deleted data, and can be commanded as to header/data gaps and what should be within them. All based around expanding towards the needs for reproduction of the CPC's .DSK file format.	2017-08-11 14:24:50 -04:00
Thomas Harte	734099a956	Threw a sector cache into my MFM parser, in an attempt to cut down analysis costs. Also made it aware of multiple heads.	2017-08-11 10:29:13 -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	1d01acce06	Fixed differing types of loop variables and targets.	2017-07-21 21:53:05 -04:00
Thomas Harte	e01f3f06c8	Completed curly bracket movement.	2017-03-26 14:34:47 -04:00
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	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	cfbab1448c	Switched to a track parsing that disallows synchronisation values within sector contents.	2016-12-31 12:23:08 -05:00
Thomas Harte	6f0b5427e4	Made an attempt to avoid repetition of sync bytes.	2016-12-31 00:20:00 -05:00
Thomas Harte	0123b37213	Made an attempt to include sync values in the stream and properly to align.	2016-12-31 00:11:31 -05:00
Thomas Harte	1f625fad66	Decided that if this is an [M]FM parsing function then it should be something more intelligent than a mere PLL record. Which I guess conveniently implies Oric DSK-esque behaviour. But properly defined, rather than very vaguely.	2016-12-30 23:10:52 -05:00
Thomas Harte	d581294479	Added get_track to get the PLL output for a complete track.	2016-12-30 19:59:23 -05:00
Thomas Harte	c740d9655a	Fixed: index_count_ may have been left high by a previous call; reset it just in case.	2016-12-30 17:55:06 -05:00
Thomas Harte	d09e7ac1e8	Made an attempt at reacting appropriately if the very first thing that looks like a sector doesn't pan out.	2016-12-30 17:44:35 -05:00
Thomas Harte	82bb78fb2d	Ensured that get_sector copes even if any invalid sectors are encountered.	2016-12-30 14:21:14 -05:00
Thomas Harte	9cb902cc4f	Experimentally marked ADF as writable too, immediately discovering a mistake in the analysing MFM decoder.	2016-12-28 22:34:22 -05:00
Thomas Harte	46a93d2e12	Fixed errors to ensure that FM disks, at least, follow the same CRC generation rules when being built from sectors and when being parsed.	2016-12-28 19:48:46 -05:00
Thomas Harte	720b1e5802	Attempted to ensure proper CRC generation for FM-format input.	2016-12-28 18:56:53 -05:00
Thomas Harte	3a9ad3fb08	Fixed Oric .DSK handling, per my latest understanding. Which creates a desire to write shorts directly to the disk surface, so exposed that in the encoder.	2016-12-28 18:50:28 -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	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	beaa868079	Factored the MFM parser out into encodings.	2016-12-25 20:00:57 -05:00
Thomas Harte	dcfdd73077	Switched to more conventional runtime polymorphism, also now allowing encoders (shifters as were) to be obtained, as a slightly lower-level interface than vector-of-sectors.	2016-11-26 13:39:20 +08:00
Thomas Harte	de863719d0	Made a first attempt at Acorn ADFS support plus the start of a suitable analyser.	2016-09-25 17:46:11 -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	64f2538b1f	Added CRC checking to DFS comprehension; fixed a bunch of places where I'd used Objective-C's #import rather than #include.	2016-09-19 08:16:06 -04:00
Thomas Harte	b1e7f2dfd0	There's no cache and no CRC checking yet, but this is probably a rough outline of an FM parser.	2016-09-18 22:03:06 -04:00
Thomas Harte	91cd7e143b	Started on the SSD/DSD support. Realised I had ommitted multiple head support from my disk class. Fixed that.	2016-09-18 19:21:02 -04:00
Thomas Harte	5409c8ec54	Switched PCMSegments to std::vector; ensured generated [M]FM tracks are correctly sized, thereby making sure the individual flux windows will be correctly sized.	2016-09-18 18:56:35 -04:00
Thomas Harte	d9aaf456f0	Adapted pervasively to MSB-first output. Which seems to be correct.	2016-09-18 18:46:58 -04:00
Thomas Harte	180c3df2d4	Calling it 'number theory' probably isn't accurate but extracted the CRC stuff and started using it for [M]FM encoding.	2016-09-18 18:33:26 -04:00
Thomas Harte	55a7418cbf	Parameterised to perform FM and MFM encodings, at least subject to CRCs still being missing.	2016-09-18 17:16:20 -04:00
Thomas Harte	22eed60d2b	Started sketching out basic MFM track encoding. Which possibly even means that the shifters don't need to be public?	2016-09-18 16:53:21 -04:00
Thomas Harte	0089c830c6	This possibly correctly encapsultes the lowest level of FM and MFM rules.	2016-09-18 14:17:06 -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	9d6dcb80a7	Started work on a GCR parser and the helper functions that lie behind that.	2016-09-13 21:53:36 -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	a00f9adba3	Made a first attempt at D64 support. Made an error somewhere but this should be 90% of it.	2016-08-01 08:41:16 -04:00
Thomas Harte	2799a87218	Reduced possibility of overflow on LCM, improved commenting widely, removed one stale piece of G64 bootstrapping caveman stuff.	2016-08-01 06:04:55 -04:00
Thomas Harte	89a1881fef	Started turning the 1540 into an actual disk drive.	2016-07-29 11:03:09 -04:00