Thomas Harte
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6633537fb8
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Discovering that there is such a thing as P81 — a ZX81 file without the name omitted — added support for it. Extended FileHolder while I was here to retain the file name and be able to supply its extension, as my quick-fix test-the-last-character approach to o/p/80/81 discrimination stops working with p81 thrown into the mix and this feels like the correct factoring.
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2017-07-22 16:02:25 -04:00 |
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Thomas Harte
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313b36944f
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Ensured that the final bit of a tape isn't dropped even if the tape ends exactly after it, by not posting a false pulse, being less restrictive about what can cap a bit, and in any case using a long gap as the end-of-file bookend.
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2017-07-22 15:41:33 -04:00 |
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Thomas Harte
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456fdda6c2
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Ensured that the mark_end step can't overwrite another recognised symbol.
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2017-07-22 15:40:22 -04:00 |
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Thomas Harte
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45ec5f8eab
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Eliminated implicit sign conversion.
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2017-07-21 21:53:27 -04:00 |
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Thomas Harte
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1d01acce06
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Fixed differing types of loop variables and targets.
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2017-07-21 21:53:05 -04:00 |
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Thomas Harte
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6d5807ec4b
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Fixed sign and ensured that the DataFromString implementation is of the thing declared in the header.
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2017-07-21 21:24:28 -04:00 |
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Thomas Harte
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64865b3f41
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Signedness fixes.
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2017-07-21 21:23:34 -04:00 |
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Thomas Harte
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163c0f1b44
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Ensured offset means exactly one thing.
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2017-07-21 20:58:17 -04:00 |
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Thomas Harte
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2d8e7e9f8b
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Removed reference to a parameter long-since dead.
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2017-07-21 20:46:25 -04:00 |
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Thomas Harte
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a026998682
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Marginally optimised set_offset to avoid resets when possible.
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2017-07-21 20:43:20 -04:00 |
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Thomas Harte
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06ea81fdb2
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Made sure that unrecognised waves don't block the symbol queue, and allowed any type of nonsense to be skipped before finding a byte.
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2017-07-21 20:23:26 -04:00 |
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Thomas Harte
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d69b1e2d11
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Switched parsing logic to looking only for upward zero crossings, that being my new understanding of the ROM.
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2017-07-21 19:39:38 -04:00 |
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Thomas Harte
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a3e0024980
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Chopped time accumulation out of the default Tape process because it's proving to be sufficiently expensive for a TZX as not to be worthwhile. Introduced a cheaper position capturing/restoring method.
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2017-07-21 18:55:03 -04:00 |
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Thomas Harte
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d9a2c32aca
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Made an attempt to obey the proper TZX rules on gaps, and to hit the common-clock-rate Time optimisation.
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2017-07-21 18:21:12 -04:00 |
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Thomas Harte
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e152ed2e61
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Made an attempt to avoid GCD costs when accumulating Times with a common clock rate (/divisor).
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2017-07-21 18:20:27 -04:00 |
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Thomas Harte
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70af075012
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Determined what appears to be an appropriate workaround for the ZX81 TZX that I've managed to obtain.
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2017-07-19 21:28:33 -04:00 |
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Thomas Harte
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c8cee88e33
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Ensured that a stopped tape outputs a false level and took an extra safety check in instantiation.
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2017-07-18 22:49:11 -04:00 |
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Thomas Harte
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35296017b5
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Clarified meaning of is_high_ flag and ensured it is honoured properly.
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2017-07-17 21:36:05 -04:00 |
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Thomas Harte
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130d598ec9
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Corrected some minor out-of-style breaks, and ensured that the name of ZX81 files is returned.
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2017-07-17 19:52:54 -04:00 |
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Thomas Harte
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0350925c1e
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Started sketching out greater support. Mostly TODOs right now, but pulse sequence and pure tone are implemented. I probably also need at least the CSW block to hit everything you might see in a ZX80 or ZX81 tape. Then I can worry about the rest when I have a way to test them.
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2017-07-17 19:38:15 -04:00 |
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Thomas Harte
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94e3dd0d4f
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Merge branch 'master' into TZX
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2017-07-17 19:07:05 -04:00 |
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Thomas Harte
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eafdd7dbd7
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Corrected decompressed size expectations: it may be up to five times the size of the number of waves, as waves are up to five bytes in length.
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2017-07-17 19:04:25 -04:00 |
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Thomas Harte
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127b584e79
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Ensured that resetting a TZX resets the is-at-end flag.
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2017-07-17 07:52:28 -04:00 |
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Thomas Harte
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2179edc7fe
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Adjusted to allow the very first thing found to be data, and ensured that unrecognised symbols break files just as gaps do.
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2017-07-17 07:43:47 -04:00 |
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Thomas Harte
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9108495586
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Added a safety seek.
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2017-07-17 07:35:53 -04:00 |
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Thomas Harte
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fa617eac6b
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Spotted that pilot and data segments have different encodings — of course! — and attempted to adapt.
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2017-07-17 07:34:10 -04:00 |
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Thomas Harte
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b63971caf7
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Took a first, incorrect, shot at TZX chunk 0x19, the generalised data block.
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2017-07-16 22:40:38 -04:00 |
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Thomas Harte
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7327da6350
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Switched the nascent TZX to use the new PulseQueuedTape.
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2017-07-16 22:06:56 -04:00 |
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Thomas Harte
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8f72fc4a44
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Factored out from the UEF implementation the concept of being a tape that has a queue of pending pulses and manages that queue.
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2017-07-16 22:04:40 -04:00 |
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Thomas Harte
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238348c885
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Performed the initial wiring to announce that this application supports TZX files and to route them to the ZX80/81 static analyser. The TZX class itself does not yet do much beyond basic validation. I think it'll be easiest if it follows in UEF's footsteps in queuing up pulses ahead of time, so some factoring out is now required.
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2017-07-16 21:33:11 -04:00 |
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Thomas Harte
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b3861ff755
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Reduced copying of Pulses.
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2017-07-16 19:49:31 -04:00 |
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Thomas Harte
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c2bc34fd87
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Eliminated the PLLParser class. I think the proper abstraction if and when another machine requires PLL-esque parsing is probably to template out the Acorn wiring of a PLL to a Parser, and/or generalise the Acorn shifter. It'll be easier to decide when the time comes.
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2017-07-16 19:25:26 -04:00 |
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Thomas Harte
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1d3ae31755
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Abstracted the concept of an Acorn shifter away from being a PLLParser. The Acorn tape parser now skips using that class and uses the shifter. The actual Electron also uses the shifter. So the two are completely aligned. Net result: the Electron should successfully load exactly when static analysis was successful.
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2017-07-16 19:24:01 -04:00 |
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Thomas Harte
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e5188a60dc
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Settled on the new average-of-length approach to a PLL window sizing, eliminating the old errors-of-phase approach. Since it anchors automatically to the original target clocks per bit, killed the explicit mention of a tolerance.
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2017-07-16 19:03:50 -04:00 |
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Thomas Harte
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e71d13c090
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With the new PLL implementation, switching to a deeper window size returns the Acorn tape parser to: working.
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2017-07-16 17:12:12 -04:00 |
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Thomas Harte
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51177e4e1f
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Attempted a different implementation of the PLL, that responds to changes only once.
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2017-07-16 16:49:04 -04:00 |
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Thomas Harte
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c8575fe6e0
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Mild clean ups, and a tweak to permitted top and bottom phase.
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2017-07-16 13:39:08 -04:00 |
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Thomas Harte
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4489f120f9
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Eliminated foolish double indirection on phase history.
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2017-07-15 22:40:38 -04:00 |
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Thomas Harte
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253f9603ed
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Split the normal tape parser class into two in order to add a new option: a PLL-driven tape parser. Decided to see what happens if I attempt to use that to parse CSW Acorn data.
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2017-07-15 19:07:35 -04:00 |
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Thomas Harte
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b743566339
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Corrected under-request of data: was erroneously supplying the size of input as the expected size of output.
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2017-07-15 15:19:03 -04:00 |
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Thomas Harte
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648618d280
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Tweaked bit timing decision.
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2017-07-13 21:26:05 -04:00 |
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Thomas Harte
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ae1a130843
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Fixed: length of 0 is a special case.
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2017-07-13 20:57:27 -04:00 |
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Thomas Harte
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33d16ae0cd
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Fixes: individual static analysers reset tapes, for potential successors. The ZX81 file analyser no longer overruns its buffer upon receiving a file that is shorter than 11 bytes.
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2017-07-12 21:34:08 -04:00 |
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Thomas Harte
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f09fe30af5
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Attempted a full implementation of CSW. All in memory for now.
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2017-07-12 21:23:59 -04:00 |
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Thomas Harte
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33eadb5549
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Started taking further steps towards CSW support; reading the ZLib documentation is next.
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2017-07-11 22:41:10 -04:00 |
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Thomas Harte
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368bff1a82
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Added a shell class that will one day be able to parse CSW files, plus the logic and metadata to instantiate it when a CSW presents itself.
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2017-07-10 21:43:58 -04:00 |
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Thomas Harte
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d853841dd5
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Further lightened up my file-is-ZX81 check.
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2017-07-10 20:44:13 -04:00 |
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Thomas Harte
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bcb7c27cc4
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Given that I'm not racing this any more, turned the intended 1 second back into 1 second.
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2017-07-08 19:21:33 -04:00 |
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Thomas Harte
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2f42874fd3
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Another fix to deal with real-time fighting: allow 8 and 18 pulses to be recognised as 1s and 0s. That's because the hand-off from ROM routines to parsing may occur very shortly before the first pulse of a valid sequence, making it look like there's a ghost. A cleaner solution needs to be found, probably revolving around allowing parsers to be attached to tapes and therefore to run constantly.
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2017-07-06 22:33:03 -04:00 |
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Thomas Harte
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84d0e9b4cd
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Accept a pulse that begins exactly on seek_time as being found while seeking.
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2017-07-06 22:31:45 -04:00 |
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