143 Commits

Author	SHA1	Message	Date
Thomas Harte	fce48b9b8c	I am instructed that the Oric actually catches only positive transitions, and compares the distance between those to a threshold. So here's an altered version of the tape parser that does that.	2016-11-09 06:37:10 -05:00
Thomas Harte	c257e7f58d	Implemented better sync-to-zero and discovered a header counting bug plus, probably, a misleading representation of gaps in the Oric TAP decoder.	2016-11-07 20:17:06 -05:00
Thomas Harte	80702616ea	Had a quick go at using the Oric parser for static analysis. Found out that synchronisation is lost. Need to investigate.	2016-11-06 22:56:38 -05:00
Thomas Harte	7205c3f82b	Made an attempt to build in Oric slow/fast detection.	2016-11-06 21:31:10 -05:00
Thomas Harte	d1ef2f7c63	Made an attempt to consolidate what I learnt of Oric encoding while building this hastily and untidily directly into the Oric implementation. ... (while adding support for the slow tape encoding mode)	2016-11-06 19:22:09 -05:00
Thomas Harte	353c1c8ea3	Shifted ownership of PETSCII -> string conversion down to the storage layer, where it's useful for tape parsing.	2016-11-06 18:43:51 -05:00
Thomas Harte	1b15bc3a6c	Started relocating the tape parsers down from static analyser to storage, to signify that they may be used by the emulation (if fast loading is supported on that machine).	2016-11-06 16:13:13 -05:00
Thomas Harte	827a919368	This is an initial attempt at reading actual tape data. It loses sync though.	2016-11-02 22:30:53 -04:00
Thomas Harte	d3634488e6	Made an attempt better to deal with multiple-file TAPs; also started using a zero level for the header/data gap.	2016-10-24 21:59:06 -04:00
Thomas Harte	cbbd31c2e0	Explained what this recently factored-out class does, and removed code from the header.	2016-10-20 19:33:25 -04:00
Thomas Harte	cc0b70828b	Removed attempt at multiple-file logic, at least for the time being. Starting to wonder whether I actually need anything beyond a literal streaming of bytes?	2016-10-16 22:15:24 -04:00
Thomas Harte	fae1bb0db9	First successful game loaded! It turns out exactly one '$' is correct. Probably.	2016-10-15 21:49:41 -04:00
Thomas Harte	952a24f769	A quick hard-wiring of the OricTAP code to get the first file in a .tap correct, damn the rest, and I'm getting some on-screen feedback. Hooray!	2016-10-15 21:39:53 -04:00
Thomas Harte	a608bbebfb	Performed enough wiring to put the onus back onto OricTAP to do appropriate things.	2016-10-15 21:32:59 -04:00
Thomas Harte	6d7c3f6ac2	Factored out the now-sampling binary-level tape player from the Vic and connected it up to the Oric.	2016-10-15 21:21:18 -04:00
Thomas Harte	4f78d693e9	Reintroduced gap as a string of 1s, made an attempt to look up bit ordering. Still unclear on high/low versus low/high.	2016-10-11 08:07:51 -04:00
Thomas Harte	70f004efbb	This may be feeding bits in the wrong direction or calculting the wrong parity or doing something else amiss but should now be correct as to bytes.	2016-10-11 07:57:10 -04:00
Thomas Harte	df01c78039	It's a bit of a mess but this is probably close to appropriate for Oric TAP files.	2016-10-11 07:39:48 -04:00
Thomas Harte	abf47efd40	Factored out Commodore is-a-ROM test, allowing it to be used from the Commodore analyser and thereby allowing ROMs to get as far as the machine again.	2016-09-29 19:39:13 -04:00
Thomas Harte	4010f36238	Ensured tape-formatted PRGs reach a conclusion.	2016-09-29 19:12:26 -04:00
Thomas Harte	ca53fac732	Switched to assuming a single-sided disk, moved out magic constants.	2016-09-26 21:20:30 -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	523dbb9678	This'll do for getting the ADF into the machine.	2016-09-25 18:32:26 -04:00
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	8a1b805d11	Fixed file offset calculation for single-sided images.	2016-09-19 07:34:10 -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	d1c861d3a5	That should be that, I hope.	2016-09-18 21:09:32 -04:00
Thomas Harte	02c9a82cb5	Edging towards SSD/DSD support. Hold on!	2016-09-18 19:32:08 -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	6454508db8	Added a quick bit of documentation.	2016-09-18 10:30:52 -04:00
Thomas Harte	65b568003d	Clarified TODO.	2016-09-18 10:29:45 -04:00
Thomas Harte	8c2bf099ad	Cut down to one GCD and clarified variable names, getting more explicit about what's going on.	2016-09-18 10:24:09 -04:00
Thomas Harte	79ef38b123	Attempted to use the new get_cycles_until_next_event method to take some repetition outside of the PLL and drive event loops.	2016-09-17 22:02:38 -04:00
Thomas Harte	dbb758aaf1	Workaround for a weird bug that suddenly appears to manifest: gzgetc is returning the file name, not bytes from the file. Seems to be related to improper initialisation of the next field within the gzFile header. I can't immediately see where ZLib intends to do that so it's a bit mysterious. But the larger-than-8 readers could probably save time by reading in blocks anyway.	2016-09-17 22:01:25 -04:00
Thomas Harte	14a9edcf5d	Made an attempt to do the time base conversion upfront, saving a lot of hassle and allowing greater prediction.	2016-09-17 19:52:27 -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	e3571e8b9e	Added insurance against an infinite loop should the tape be exhausted.	2016-09-12 22:22:23 -04:00
Thomas Harte	eeec516fa6	Implemented seeking on tapes, mucked about a bit more with the Commodore analyser, at least temporarily removed cropping from the Vic emulator.	2016-09-11 17:09:00 -04:00
Thomas Harte	1de6097f06	Shuffled C stuff out on top.	2016-09-08 21:08:03 -04:00
Thomas Harte	24251a2768	Negligible indentation fix.	2016-09-08 07:49:43 -04:00