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1020 Commits

Author SHA1 Message Date
Thomas Harte
b7065575f3 Added (empty) call-ins for DMA usage; switched to having the 'is seeking' bit in the status register stay high until sense interrupt status, but now it goes high even for seeks that don't actually go anywhere, and corrected interpretation of the specify command, with a positive result: the received step rate time, now that it's being interpreted correctly, is much shorter. 2017-08-14 09:04:22 -04:00
Thomas Harte
7ea703f150 Started making provisions for a DMA-compatible implementation. Re: the CPC, it sounds like DMA acknowledge might be permanently wired, causing DMA mode seemingly to work from the 8272's point of view. 2017-08-14 08:38:00 -04:00
Thomas Harte
1011143dbe Sought to correct my interpretation of 'gap 3'. 2017-08-13 21:52:48 -04:00
Thomas Harte
9ace6e1f71 Applied minimum constraints for specified parameters. 2017-08-13 19:25:57 -04:00
Thomas Harte
5221837be8 Fixed Non-DMA flag for the format track execution phase. The emulated machine now provides sector details. 2017-08-13 18:51:06 -04:00
Thomas Harte
e1e9a06712 Made an attempt at format a track. 2017-08-13 18:05:19 -04:00
Thomas Harte
b0a7208cc7 Strung together a very basic version of 8272 write [/deleted] data. Lots of cases as-yet unhandled. 2017-08-13 12:50:07 -04:00
Thomas Harte
eec42aa7ae Entrusted further status to drives; also adjusted them to report read only if diskless, which I now believe to be correct. 2017-08-13 11:50:49 -04:00
Thomas Harte
5f42022c1d Added a tester for the control mark. 2017-08-12 17:35:14 -04:00
Thomas Harte
11d0c37506 Attempted to find a more expressive way for maintaining state — macros for all conditions, to bind both values and destinations. 2017-08-12 17:33:52 -04:00
Thomas Harte
27d1dc5c37 Removed some old printfs. 2017-08-12 16:49:20 -04:00
Thomas Harte
7135259cc1 Sought to flesh out error conditions. 2017-08-12 16:36:37 -04:00
Thomas Harte
4909325e79 Implemented read deleted data. 2017-08-12 13:01:17 -04:00
Thomas Harte
a4ee697ed1 Quickie: head unload is scheduled only if the head is presently loaded. 2017-08-12 12:53:45 -04:00
Thomas Harte
0f15a2f97f Relented: it actually looks like status bytes aren't per-drive. But each drive may fail at seeking individually. So that piece of state accumulates at the 8272 drive. 2017-08-12 12:52:36 -04:00
Thomas Harte
89ace671a4 Corrected unload time. Was 8000 times too short. 2017-08-12 09:44:01 -04:00
Thomas Harte
e7db2a2f6d Sought to introduce head loading and unloading delays. 2017-08-12 09:36:21 -04:00
Thomas Harte
ffb1a14ace Minor: clear status registers before a read data. 2017-08-11 18:56:33 -04:00
Thomas Harte
e4f04d0977 Merge branch 'master' into AYFidelity 2017-08-11 14:41:08 -04:00
Thomas Harte
a5593bec79 Threw in support for the light-pen trigger. 2017-08-10 15:00:14 -04:00
Thomas Harte
a1e2646301 Imposed counter size limits. 2017-08-10 14:58:24 -04:00
Thomas Harte
6a6e5ae79c Forced users of the 6845 to be explicit about which type. So far with no effect. 2017-08-10 12:28:57 -04:00
Thomas Harte
02d792c003 Simplified logic slightly, avoiding repetition. 2017-08-10 11:48:37 -04:00
Thomas Harte
be8e7a4144 Eliminated false register aliasing, restricted register sizes and locked out reading and writing where appropriate. 2017-08-10 11:22:30 -04:00
Thomas Harte
b1dbd7833a Merge branch 'master' into 6845Address 2017-08-10 11:15:08 -04:00
Thomas Harte
a4c910f1de This appears to be a more accurate take on 6845 address advancement — it is necessary that character output has finished for the line address to be updated. 2017-08-10 11:12:53 -04:00
Thomas Harte
2eed24e859 Made an initial attempt at [a subset of] multi-sector reads. 2017-08-10 11:11:26 -04:00
Thomas Harte
b11d142cff Switched to descriptive names. 2017-08-08 20:35:41 -04:00
Thomas Harte
021ff8674e Added something for sense drive status. 2017-08-08 20:30:54 -04:00
Thomas Harte
e3d1f4fe1e Subjectively, this might be more correct. It definitely prevents intermediate frequencies. More research required. 2017-08-08 17:58:35 -04:00
Thomas Harte
3bdedfd749 Improved comments. 2017-08-08 07:44:46 -04:00
Thomas Harte
46278ff297 Experimental: is this meant to be a compare-before-increment? 2017-08-07 23:02:29 -04:00
Thomas Harte
390ecec3d9 Added: now declines to pass on output if in input mode for ports A and B. 2017-08-07 19:56:22 -04:00
Thomas Harte
41a30c147d Adjusted: invalid register selection simply deselects all registers. 2017-08-07 19:51:36 -04:00
Thomas Harte
4709ae80cb Added port direction tests. 2017-08-07 19:36:55 -04:00
Thomas Harte
7fbb455836 Per the CPC test I'm checking, 0s should be returned for non-retained bits, not 1s. 2017-08-07 19:07:12 -04:00
Thomas Harte
745afd217f The port input/output flags are now honoured; reading a port that is set as an output returns the current output value. 2017-08-07 19:01:18 -04:00
Thomas Harte
47732ffb98 Prevented the 8272 from overreading ID fields (and, by doing so, overrunning its internal buffer). Exposed the MFMController's CRC generator for inspection. 2017-08-07 12:37:22 -04:00
Thomas Harte
d07f3216ab Added a broad phase on whether seeking is ongoing. 2017-08-07 12:12:59 -04:00
Thomas Harte
68c73184b1 Had failed to spot that by taking control of stepping at this level, the appropriate invalidate_tracks were not being sent. 2017-08-07 10:36:53 -04:00
Thomas Harte
7f824d6494 Ensured seeks and recalibrates end immediately if no seeking is required. 2017-08-07 10:31:32 -04:00
Thomas Harte
3219212f03 A closer inspection of the data sheet seems to suggest that invalid command sequences will post ST0. 2017-08-07 07:35:41 -04:00
Thomas Harte
d90e35e5bd Added a bunch of comments, and ensured that the data request bit remains set for the entire period that command bytes are accepted. 2017-08-07 07:27:00 -04:00
Thomas Harte
73f8488150 Reaching the end of the usable part of my day, decided to tidy up a little before bed with indentation that reflects a distinction between top-level entry points and mere loops. 2017-08-06 22:14:18 -04:00
Thomas Harte
3853966a1e Removed formal storage of ST3, as it just seems to be composed live. This may turn out also to be the best way to deal with ST0–2, time will tell. Also took a stab at the error in responding properly to the ROM's intended use of seek might be accepting new commands as replacements for old ones rather than rejecting them. That didn't seem to do the trick. 2017-08-06 22:10:12 -04:00
Thomas Harte
d63893a437 Collapsed implementations of recalibrate and seek, and decided to intend to go for an upward count on steps taken rather than a downward one. But seek continues presently to fail. 2017-08-06 21:52:52 -04:00
Thomas Harte
90c74043f5 Remembered to toggle off RQM between bytes. CAT now works. 2017-08-06 21:21:59 -04:00
Thomas Harte
600445d90a Made a first attempt to return sector contents. 2017-08-06 20:40:29 -04:00
Thomas Harte
e4b405fd3d With the ROM now using a read ID to set its expectations, implemented that and fixed FIND/READ_HEADER macros for multiple use. Execution now reaches the unimplemented section of read data. 2017-08-06 20:32:46 -04:00
Thomas Harte
3b7ecbdf0d Renamed result_ to result_stack_ to emphasis the fact that it goes backwards. Switched meaning of CB so that it is set for the entire command, execution and result phases. 2017-08-06 20:17:12 -04:00
Thomas Harte
01efb645cb Took a reasonable gamble that the CHRN reported is from internal registers, not from the last-found header. 2017-08-06 19:57:34 -04:00
Thomas Harte
b5ec1f42d5 Started resetting 'busy' when entering the result phase. AMSDOS now complains of a missing disk after failing to find sector 01. My belief is that it should end up asking for C1. So this is not even getting through a failure to find a sector correctly yet. 2017-08-06 19:48:17 -04:00
Thomas Harte
e9972aa0dd Added respect for the index-hole limit on reading, and an error phase. 2017-08-06 19:25:44 -04:00
Thomas Harte
1c9a744b01 Made an effort to start inspecting ID fields, at least. Discovered that my emulation has somehow stopped proceeding beyond sense interrupt status though. Fix one in that area: adjust ST0 just in time for the sense interrupt status response, as that'll need to specify the drive number properly. 2017-08-06 18:06:20 -04:00
Thomas Harte
e6d4bb29d8 Discovered correct sense interrupt status result if nobody is in the completed seeking state, and switched to it. It's a single 0x80 rather than two bytes. 2017-08-06 15:34:33 -04:00
Thomas Harte
6c5b562d97 Made an attempt at some of the correct seek/recalibrate behaviour: it's now asynchronous from command processing and able to work on up to four drives at once. I just probably am not yet hitting all the status flags I need to hit. 2017-08-06 15:22:07 -04:00
Thomas Harte
a7103f9333 Disks are now communicated to the 8272. Which is able to handle four of them. 2017-08-06 13:24:14 -04:00
Thomas Harte
c12425e141 Added storage for the extended four status registers, and made an attempt at implementing the two most trivial result-phase commands. Am slightly paused momentarily trying to figure out whether seek activity is orthogonal to read/write activity. 2017-08-06 12:55:57 -04:00
Thomas Harte
89f6de1383 Started on a real ugly-implementation coroutine approach, and implemented specify as a fairly trivial first command: it has no result phase, and is the only thing called by AMSDOS as part of the initialisation sequence. 2017-08-06 12:36:18 -04:00
Thomas Harte
34eaf75352 Fixed WAIT_FOR_TIME macro. 2017-08-06 12:08:54 -04:00
Thomas Harte
29288b690e Switched disk controllers to be instantiated explicitly in terms of cycles, created an Amstrad-specific subclass of the 8272 to record the direct programmatic availability of all disk motors bundled together, and otherwise adjusted to ensure the thing is clocked and that the motor is enabled and disabled appropriately. The 8272 is also now formally a subclass of the incoming MDM controller. 2017-08-06 09:45:16 -04:00
Thomas Harte
25fd3f7e50 Mildly increased work in here, still primarily oriented towards logging what I actually need to get done. 2017-08-05 22:26:59 -04:00
Thomas Harte
3e984e75b6 Strung up an empty shell that eventually should contain the 8272, and added appropriate IO decoding to the Amstrad. 2017-08-05 19:45:52 -04:00
Thomas Harte
26ce6cdab2 Permitted register 3 to dictate vertical sync length. 2017-08-04 08:56:36 -04:00
Thomas Harte
3ca9c38777 Attempted to move to more accurate bus reading — if control lines are set then all subsequent data inputs should act according to the current control lines; changes to port input should be reflected live upon readings, etc. 2017-08-02 19:45:58 -04:00
Thomas Harte
0267bc237f Added the ability to set a port input, and relaxed bus state testing. I think my on-demand bus reactions here are inappropriate, so more work to do here probably. 2017-08-01 18:04:51 -04:00
Thomas Harte
e6854ff8db Corrected typo: the input to an AY is BDIR, not BCDIR. 2017-08-01 17:06:57 -04:00
Thomas Harte
2d4e202be3 Completed dangling comment. 2017-08-01 17:01:36 -04:00
Thomas Harte
64da8e17d1 Fixed: of course this should take a reference to an existing port handler rather than hatching its own; otherwise additional communication with a port handler by an i8255 owner doesn't work as intended. 2017-08-01 17:01:20 -04:00
Thomas Harte
08ad35efd9 It's barely an implementation of the 8255, but ensured that data is bounced into the PortHandler, conveniently assuming the interaction mode used by the CPC. 2017-08-01 16:34:13 -04:00
Thomas Harte
58b98267fc Formally transferred ownership of PIO accesses to an incoming template, and decided to start being explicit about how to specify the interfaces and provide fallbacks for optional behaviour for the new, clean generation of interfaces. A full-project sweep will inevitably occur but I'll try to tie off this branch first. 2017-08-01 16:15:19 -04:00
Thomas Harte
ace71280a0 Removed implementation file; this is only ever going to be a template. 2017-08-01 16:00:17 -04:00
Thomas Harte
1d99c116e7 Actually, this is probably more correct: increment and then compare, but increment the refresh address once more after the final character, to avoid repeating it. 2017-08-01 15:29:37 -04:00
Thomas Harte
ee27e16fb1 Switched to post-tests increment. Seems to give proper screen width, but also eliminates that 'compare to +1' step that felt unlikely. 2017-08-01 15:19:25 -04:00
Thomas Harte
3b1db14817 Made a quick attempt at properly updating the refresh address. 2017-08-01 07:36:03 -04:00
Thomas Harte
e3f677fa37 I was under-counting row lines. Adjusted comparison. The emulator now produces a solid white square of approximately correct proportions. I'm sure that filling in pixels will reveal the next set of bugs. 2017-07-31 22:21:46 -04:00
Thomas Harte
5c68b6cc21 Fixed display enable reset when there's no adjustment area. A practical lesson in failure to factor. 2017-07-31 22:16:08 -04:00
Thomas Harte
ffaa627820 Fixed frame restart when there is no adjustment period. 2017-07-31 22:13:45 -04:00
Thomas Harte
5a396f6787 Added an explicit cast. 2017-07-31 22:04:31 -04:00
Thomas Harte
cb0dc7b434 I'm sure it's not going to be this easy, but this is a genuine attempt at full horizontal and vertical timing. 2017-07-31 22:01:54 -04:00
Thomas Harte
e28829bd1b Corrected CRTC timing, gave it someone to talk to and a means with which to talk. 2017-07-31 20:14:46 -04:00
Thomas Harte
68ceeab610 Created a 6845 class and started pushing data at it and clocking it. It doesn't currently have the concept of a bus but will do, hence the in-header implementation. 2017-07-31 19:56:59 -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
1da24d10fd Corrected a couple of build errors. 2017-07-27 08:05:14 -04:00
Thomas Harte
8361756dc4 Switched definitively to the works-for-now approach of requiring an explicit opt-in where somebody wants to clock a whole-cycle receiver from a half-cycle clock. 2017-07-27 07:40:02 -04:00
Thomas Harte
1c2f68f129 Removed, as it's been relocated. 2017-07-25 20:43:05 -04:00
Thomas Harte
75d67ee770 Relocated ClockReceiver.hpp as it's a dependency for parts of the static analyser, and therefore needs to be distinct from the actual emulation parts. 2017-07-25 20:20:55 -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
545683df6f Added some documentation, got explicit again about cycle/half-cycle intermingling, and added flush as what amounts to divide(1), for cleaner usage without a clock divider. 2017-07-25 19:50:40 -04:00
Thomas Harte
cfbd62a5dc Attempted to fix implementation of divide, and marked everything as-yet unmarked as inline. 2017-07-25 07:43:39 -04:00
Thomas Harte
40339a12e1 Formalised the use of a cycles count with a divider, bringing a few additional plain-int users into the fold. 2017-07-25 07:15:31 -04:00
Thomas Harte
9be9bd9106 Neatened layout. 2017-07-24 22:52:35 -04:00
Thomas Harte
c1527cc9e2 Reduced back-and-forth between Cycles and ints within the Oric. 2017-07-24 22:46:31 -04:00
Thomas Harte
a1a3aab115 Fixed implicit sign conversion. 2017-07-24 22:40:15 -04:00
Thomas Harte
c77a83d86f The 6560 is now a ClockReceiver. This reduces to zero the number of remaining instances of the text run_for_cycles in this codebase. 2017-07-24 22:38:35 -04:00
Thomas Harte
efdac2ce8c The 6522 is now a ClockReceiver. 2017-07-24 22:29:09 -04:00
Thomas Harte
2912d7055b The 6532 is now a ClockReceiver. 2017-07-24 21:57:24 -04:00
Thomas Harte
b7f88e8f61 Filter is now a ClockReciever, affecting all sound output devices. 2017-07-24 21:29:13 -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
b82bef95f3 Decided to follow through on Cycles and HalfCycles as complete integer-alikes. Which means giving them the interesting range of operators. Also killed the implicit conversion to int as likely to lead to type confusion. 2017-07-24 20:10:05 -04:00
Thomas Harte
8a0b0cb3d7 Extended both classes to allow copy assignment, copy construction and implicit zero-length construction. 2017-07-23 22:13:41 -04:00
Thomas Harte
1ba3f262a2 Sketched out a template for clock-receiving components to allow them to be implemented in terms of either half or whole cycles. 2017-07-22 21:46:50 -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
aaa60dab12 Fixed signedness of index. 2017-07-21 21:21:01 -04:00
Thomas Harte
12f7e1b804 Enshrined a default colour burst amplitude. Which now everybody relies on. The 102 figure is derived from the burst apparently being 40 IRE. 2017-07-07 23:35:14 -04:00
Thomas Harte
eb8a2de5d6 Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80. 2017-05-15 07:38:59 -04:00
Thomas Harte
e270b726b3 Tweaked blue, increased saturation. 2017-05-13 22:01:02 -04:00
Thomas Harte
44ce7fa54c Corrected luminances across the board, and PAL colours. 2017-05-13 21:50:09 -04:00
Thomas Harte
b0142cf050 Made an updated stab at NTSC colours. 2017-05-13 14:29:36 -04:00
Thomas Harte
a340331229 Introduced 1-bit of saturation, returning black and white as black and white. 2017-05-11 21:31:58 -04:00
Thomas Harte
15d17c12d5 Switched the 6560 to two bytes per pixel, since one isn't sufficient for precision and because mixing up the implementation might help me to figure out what's amiss. 2017-05-09 21:22:01 -04:00
Thomas Harte
5998123868 Added some consts, for a minor safety improvement. 2017-05-06 19:53:24 -04:00
Thomas Harte
e01f3f06c8 Completed curly bracket movement. 2017-03-26 14:34:47 -04:00
Thomas Harte
a4c5eebd1e The latest Atari Age-discovered numbers suggest this starts up in 1024T mode. 2017-03-21 18:22:50 -04:00
Thomas Harte
c445eaec3e Switched startup values, following a comment on AtariAge. May or may not be correct, the thread was speculative. 2017-03-19 17:38:26 -04:00
Thomas Harte
e0bca1e37b Reinstated the 16 and 32 kb Atari pagers, and ensured the 6532 always starts in a valid state. 2017-03-18 17:34:34 -04:00
Thomas Harte
d3257c345a Tested against public ROMs and corrected. Also moved the deferred adjustment into a more canonical place. 2017-03-04 17:00:28 -05:00
Thomas Harte
e09b76bf32 Fixed 'same value, then immediate increment, then proper counting increments' behaviour and ensured it takes one cycle to commit a value. Adjusted tests to match. 2017-03-04 15:57:54 -05:00
Thomas Harte
ced644b103 It seems likely that an AY divides its clock by 8, not 16. I had conflated wave frequency and counter clock. 2017-01-11 22:03:01 -05:00
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
ca50606e1d Restored Vic audio. 2016-12-03 17:10:47 -05:00
Thomas Harte
36bc558798 Converted all 'Components' to postfix underscores. 2016-12-03 10:51:09 -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
7eeaac23e7 Reversed myself. I once again do not think the clock is divided by 256 for envelopes. 2016-11-11 20:31:48 -05:00
Thomas Harte
77987bf31e Decided to go with divide by 256 for the envelope counter after all. 2016-11-09 21:51:56 -05:00
Thomas Harte
77ce200fbb Simplified/corrected AY tone/noise mixer logic, and made a new guess at the effect of reading registers that are smaller than 8 bits. 2016-11-09 21:21:17 -05:00
Thomas Harte
fa65cc2058 Resolved type conversion error. 2016-11-05 12:57:01 -04:00
Thomas Harte
30c670f8de Ensured programmatic setting of the timers occurs during phase 2 _instead_ of counting. 2016-11-04 21:30:18 -04:00
Thomas Harte
21604376e6 Reintroduced clocking of the AY and boxed in the range of the master divider a little further. 2016-10-30 22:51:08 -04:00
Thomas Harte
ad00304e8a Fixed 6522 countdown. 2016-10-28 21:05:42 -04:00
Thomas Harte
4fab794747 Added a direct-to-two-cycles emulation path for 6522 owners. 2016-10-27 21:13:25 -04:00
Thomas Harte
2eda0b3c86 Attempted to simplify the logic behind the most common 6522 usage. 2016-10-27 21:06:31 -04:00
Thomas Harte
fd823dc222 Settled on terminology. 2016-10-23 20:42:49 -04:00
Thomas Harte
b12f2f2796 Switched to more straightforward version of two-step loop, dealing with my mistaken dealing of when _master_divider&15 == 0 upon entry without adding an extra sanity check. Am also temporarily on non-modulo logic for tone generation, for a profiling test. 2016-10-23 20:32:48 -04:00
Thomas Harte
583db88299 Added a dispatch queue-powered Apple implementation of the async task queue, removed any mention of skip_samples in the AY since it isn't implemented. 2016-10-22 21:58:45 -04:00
Thomas Harte
33e628a096 Made an attempt to eliminate what amounts to manual division. 2016-10-21 22:16:44 -04:00
Thomas Harte
46a3c0922f Slightly simplified code, fixed divider. 2016-10-21 22:12:44 -04:00
Thomas Harte
d7c0c49715 Might as well be consistent with divider loads. 2016-10-21 20:07:14 -04:00
Thomas Harte
782ef960e1 Sought both to [start to] optimise the AY and correct divider reloads. It turns out that conditionals aren't that troubling. But I can probably eliminate the counters. 2016-10-21 20:05:38 -04:00
Thomas Harte
cd59eb5f43 Implemented non-linear volume. 2016-10-19 23:07:51 -04:00
Thomas Harte
b59da7d4bc Added some documentation. 2016-10-19 22:47:44 -04:00
Thomas Harte
08275c6241 Fixed mixer IO bit usage. 2016-10-19 22:22:15 -04:00
Thomas Harte
59162228ef Reduced mask for clarity. 2016-10-19 22:14:05 -04:00
Thomas Harte
319d7c2b12 Fixed premature wrapping of the envelope, played about with whether that should be subject to a predivision by 256. It feels unlikely? 2016-10-19 22:12:51 -04:00
Thomas Harte
6073906c39 Commented and fixed mistake that would equate any noise divider > 32768 with 0. 2016-10-19 21:51:35 -04:00
Thomas Harte
101f168ea4 Made an attempt to tidy up. 2016-10-19 21:43:18 -04:00
Thomas Harte
ada37abe23 Made an attempt to implement noise and envelopes. Not quite right yet. 2016-10-19 21:13:22 -04:00
Thomas Harte
bd6e6674a0 Fixed signed shift assumption and noise-related register test. 2016-10-18 22:20:12 -04:00
Thomas Harte
9669a5ec9b Switched to a more authentic interfacing to the AY. 2016-10-18 19:32:15 -04:00
Thomas Harte
43612e1ca2 Made an attempt to eliminate conditionals (running before I can walk?) and started edging towards an envelope generator. 2016-10-17 08:03:38 -04:00
Thomas Harte
9730e8247f Ensured propagation of synchronise messages, added enough to do plain tone. Probably. So: noise and envelopes missing. And it's all far too quiet. 2016-10-15 21:04:21 -04:00
Thomas Harte
51bdac27ae Made some AY advances; it's now being polled for samples and collecting more information on what it needs to output. 2016-10-15 17:45:39 -04:00
Thomas Harte
288d10c253 Got some keyboard reaction. 2016-10-14 21:44:15 -04:00
Thomas Harte
138eabcff4 Continued in my effort to wire up a keyboard. Will need further to continue. 2016-10-14 21:35:15 -04:00
Thomas Harte
d8e4c488c2 Started iterating towards having an AY and a fully-working keyboard. 2016-10-14 21:18:03 -04:00
Thomas Harte
922dd6a586 Hit up the other two kinds of audio generator. 2016-10-07 17:10:00 -04:00
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
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
1541273785 Moved responsibility for throwing in a low-pass filter up to the Vic, appropriately. 2016-08-21 18:13:31 -04:00
Thomas Harte
c783090980 It turns out that the Vic has a 1.6Khz low-pass filter. So added that. 2016-08-21 12:13:41 -04:00
Thomas Harte
8d839c5278 I think this is correct. And have explained why. 2016-08-20 16:54:43 -04:00
Thomas Harte
7c9455251d Fixed reload for the lower-frequency audio channels. 2016-08-19 17:34:01 -04:00
Thomas Harte
99157ad6b2 Ensured the 6560 knows its real audio clock on a PAL machine; removed some stray semicolons. 2016-08-19 13:35:34 -04:00
Thomas Harte
902c0f967a Implements known phase pattern for PAL output. 2016-08-17 08:09:48 -04:00
Thomas Harte
142774be37 Collapsed 6560 template to a more direct loop, albeit with quite a bit still left to fix. 2016-08-09 21:10:53 -04:00
Thomas Harte
12bad8f23f Turned the 6560 into an ordinary template, similar to the rest of the project, albeit right now with a fairly shonky internal implementation. Fixed a Mac-specific interface sizing issue. 2016-08-09 20:41:05 -04:00
Thomas Harte
3e65450a54 Converted the 6560 fully into a template; worked on allowing the typer to run at a much faster rate where hardware has some trigger by which it can request the next key. 2016-08-06 14:33:24 -04:00
Thomas Harte
c6e046253e Shunted code for the main part up into the header, in advance of turning it into a template so as to bring it inside the normal orthodoxy. 2016-08-05 19:13:49 -04:00
Thomas Harte
5d40d70c92 Fixed 6560 addressing error, added an autotyper for Vic disks (more work potentially needed), fixed semantics for testing whether a 6502 is about to reset. 2016-08-01 10:32:32 -04:00
Thomas Harte
b43a7381ae Fixed framing and first-byte-after-sync signalling. Hacked together as parts of it are, loading now appears to work! 2016-08-01 04:25:11 -04:00
Thomas Harte
11cd541786 Fixed accidental indentation. 2016-07-10 08:05:05 -04:00
Thomas Harte
c0ab45a73d Disabled a bunch of the caveman debug logging. 2016-07-09 22:29:11 -04:00
Thomas Harte
7cc4bf3fe7 Hit and hope is getting me nowhere. Time to unit test this thing. 2016-07-09 15:40:25 -04:00
Thomas Harte
1baf21827c Since the ROM is well disassembled, let's actually try to be a 1541 first. 2016-07-06 22:17:32 -04:00
Thomas Harte
8819711bc8 Threw in the second VIA as a currently clearly incorrect thing. 2016-07-05 22:22:09 -04:00
Thomas Harte
602e7f01c7 Control lines seem to have evolved to pure push. 2016-07-05 21:15:29 -04:00
Thomas Harte
93c2bb80a2 Improved a comment, added independent C[A/B]2 input mode. 2016-07-05 21:11:51 -04:00
Thomas Harte
1bb109a23b Made a quick attempt at basic C[A/B]2 interrupts. 2016-07-05 20:39:15 -04:00
Thomas Harte
c3b7d24293 It appears that the attention line is also wired to CB2. So the ball is back in the 6522's court. 2016-07-05 19:19:46 -04:00
Thomas Harte
97751a9d86 Took the preliminary steps necessary to wire up a serial port. 2016-07-05 10:55:47 -04:00
Thomas Harte
88964ceac0 Eliminated plain pointer passing for object types. 2016-07-04 19:33:55 -04:00
Thomas Harte
82b0bc9b58 Discovered that this is another meaningful usage of using. 2016-07-04 19:10:10 -04:00
Thomas Harte
7fa010a463 Attempted to add support for the most basic of control line output, and slightly to optimise the Vic. 2016-07-01 19:01:22 -04:00
Thomas Harte
5c85366de2 Made an attempt to prevent spurious border colour pushes. 2016-06-29 21:22:26 -04:00
Thomas Harte
ff53accca0 Demonstrated that issue is coloured borders, made a guess as to buffer exhaustion, upped limits as a temporary fix. 2016-06-29 21:16:34 -04:00
Thomas Harte
0182b0483a Added a 'power on' flag that is set automatically at construction but can be declined. Saves all that stuff of every machine having to set and then unset the RST line, and fixes an Electron bug related to that. 2016-06-29 19:13:24 -04:00
Thomas Harte
de5d2f1113 Ensured the line counter increments late on NTSC. 2016-06-27 22:12:55 -04:00
Thomas Harte
69d78dfdb3 Removed logging. 2016-06-26 21:36:26 -04:00
Thomas Harte
843d1fdca7 Added some extra logging while trying to determine what's going on; added interrupt clearing for the control lines. 2016-06-26 21:30:06 -04:00
Thomas Harte
c306d705e1 Made a quick first attempt at all-the-way-through tape wiring for the Vic. 2016-06-26 19:43:09 -04:00
Thomas Harte
37ba42a52f Factored out the stuff of playing a tape, started basic sketch of the Vic-related classes. 2016-06-26 19:03:57 -04:00
Thomas Harte
066db59773 Made a hasty attempt to implement CA1 and CB1 input as a potential source of interrupts. 2016-06-26 16:32:27 -04:00
Thomas Harte
d5e50f5ea0 Got a bit more explicit about how ports are identified on the 6522. 2016-06-26 12:30:01 -04:00
Thomas Harte
3c9183d034 Improved some commenting. 2016-06-23 20:43:29 -04:00
Thomas Harte
359ffb9aa7 Made some attempt to implement what appears to be the proper address generation logic. 2016-06-23 07:32:24 -04:00
Thomas Harte
b753690d5e Made an attempt to adjust the 6560 to a model compatible with that advocated by the available documentation. Exact decision timing may need further work. 2016-06-21 22:12:01 -04:00
Thomas Harte
106e56600d Added a DC offset for 6560 volume level, albeit one plucked from thin air. 2016-06-21 07:31:14 -04:00
Thomas Harte
fe17d1778c Expanded 6532 tests substantially, beefing up implementation to match. 2016-06-20 21:02:42 -04:00
Thomas Harte
88e2b382e5 Made an attempt at a full and thorough 6532 implementation (and got a bit more explicit about flag size in the 6502). 2016-06-20 18:57:35 -04:00
Thomas Harte
d4b9ff0ca4 Doubles up on register mirroring. Will do for now. More to come. 2016-06-20 07:27:38 -04:00
Thomas Harte
4db61d98f4 Killed the .cpp. 2016-06-19 20:21:38 -04:00
Thomas Harte
7cf6008e7c Started some very basic RIOT unit tests; corrected to pass. 2016-06-19 20:12:47 -04:00
Thomas Harte
65413f078c Factored out the 6532, eventually to make it testable. 2016-06-19 18:57:40 -04:00
Thomas Harte
ce2f5515c0 Made some minor documentation improvements, killed 6522.cpp as the 6522 is going to be a template only, attempting to promote good inlining behaviour. 2016-06-19 18:11:37 -04:00
Thomas Harte
f4915c5ad6 Fixed test and added basic implementation of data direction. 2016-06-18 17:17:03 -04:00
Thomas Harte
5d26cd85a3 Wrote test case for what appears to be correct timer behaviour if those were acting in isolation. Ensured implementation matches test case. 2016-06-18 14:30:23 -04:00
Thomas Harte
394902f409 Switched to clocking the 6522 by the half-cycle. Very trivial test now passes. 2016-06-18 13:57:10 -04:00
Thomas Harte
595791cee0 Made the base 6522 class more abstract: you must now opt-in if you want the IRQ line to be sent to a delegate. 2016-06-18 08:51:18 -04:00
Thomas Harte
ce7488dd30 Added support for _invertedCells. Treading water a little before making real changes. 2016-06-14 21:06:29 -04:00
Thomas Harte
926f819e3b Added some documentation, made the speaker private. 2016-06-14 20:00:16 -04:00
Thomas Harte
a2a6e3c818 Fixed phase offsets. 2016-06-14 18:19:06 -04:00
Thomas Harte
f4884a3481 Added the noise channel, albeit not very creatively. 2016-06-14 17:50:32 -04:00
Thomas Harte
c18cc4c8f5 It appears the Vic's output is sine-ish, after all. Also adjusted centre of display, simultaneously adding some validation on that. 2016-06-14 07:29:35 -04:00
Thomas Harte
fdc854c0c2 Fixed tone channels; made an attempt at loading PRGs that are supposed to go into RAM. 2016-06-13 21:49:59 -04:00
Thomas Harte
efcb196ef7 Made a complete attempt at the tone channels. 2016-06-13 20:59:01 -04:00
Thomas Harte
f1a45c1011 Merge branch 'VicAudio' into Vic-20 2016-06-13 19:34:13 -04:00
Thomas Harte
2d23bc46f2 Whoops; fixed line count target test. 2016-06-13 19:34:01 -04:00
Thomas Harte
5fc36b956c Attempted most basic sketching of a container for Vic audio. 2016-06-13 19:30:52 -04:00
Thomas Harte
91c406e065 Made an attempt to honour interlaced-frame line counts. 2016-06-13 18:21:21 -04:00
Thomas Harte
2e946e785f Settled on half-intensity colour for now, appears likely not to be too incorrect(?) 2016-06-13 18:20:21 -04:00
Thomas Harte
e10535181d Made an attempt to implement interlaced video. 2016-06-12 22:27:58 -04:00
Thomas Harte
4ad55a7f5e Trimmed the visible area. 2016-06-12 18:01:38 -04:00
Thomas Harte
a5efa7543a Added vertical sync, switching fully to the normal NTSC colour space. 2016-06-12 17:57:52 -04:00
Thomas Harte
4c2b964cd4 Added NTSC-VIC's switching of phase every field. 2016-06-12 17:45:25 -04:00
Thomas Harte
6b5a322918 Fixed all colours, plus special case no-chroma for black and white. 2016-06-12 17:41:52 -04:00
Thomas Harte
580c8bdcbd Ported rest. 2016-06-12 17:29:44 -04:00
Thomas Harte
1a2b18f93b Steps towards CPU mapping; diagnostic. 2016-06-12 17:27:57 -04:00
Thomas Harte
8abf395202 Experimented with table-based GLSL lookups, and a sine curve. Now _exceedingly_ slow, but colours are correct if I pretend I'm in the YUV colour space. 2016-06-12 14:57:24 -04:00
Thomas Harte
2992183aae Switched to a lookup table for phase, temporarily in YUV colour space, probably. Working on it. 2016-06-12 14:39:17 -04:00
Thomas Harte
ed76e36b18 Made basic attempt at 16-line character mode. 2016-06-12 11:23:57 -04:00
Thomas Harte
d1731b1d26 Hacked my 6522 to work. Mistake is in not returning output as input when appropriate — i.e. that I'm ignoring data direction. Also fixed K and L keys. 2016-06-11 13:06:01 -04:00
Thomas Harte
7a241b5ef5 Added just enough hopefully to allow implementation of the keyboard-input VIA. 2016-06-11 11:34:39 -04:00
Thomas Harte
de84758862 This is how flags writes are supposed to work, it seems. 2016-06-11 07:58:32 -04:00
Thomas Harte
1054793fd7 Fixed interrupt enable register. This makes a lot more sense! 2016-06-11 07:57:04 -04:00
Thomas Harte
82a3c4964b Decided to keep the internal copy of the interrupt enable the other way around. Reduced delegate noise. 2016-06-11 07:49:07 -04:00
Thomas Harte
a71259dec3 Gave the 6522 a full and grouped register set. 2016-06-11 07:12:55 -04:00
Thomas Harte
1ed04fae1e Resolved 6560 addressing. 2016-06-10 18:12:21 -04:00
Thomas Harte
f3b1d7de82 ... and that's a flashing cursor. Keyboard input next! 2016-06-09 22:37:59 -04:00
Thomas Harte
30b7db3979 Attempted a square wave, made the Vic itself responsible for address manipulation re:the 6560. 2016-06-09 22:05:17 -04:00
Thomas Harte
e99055bedb Attempted switching back to a square wave for the composite video and otherwise implementing what's necessary to get to that flashing cursor — the 6560 returns its scan line and the timing bits of the 6522 are appearing. 2016-06-08 22:15:24 -04:00
Thomas Harte
581eace478 Increased logging slightly, ensured all of colour RAM can be read, slightly improved the 2600 pixel decoder. 2016-06-07 22:01:14 -04:00
Thomas Harte
26ab96868a Decided to turn the 6522 into a template, since it's a per-cycle thing with variable behaviour. Added appropriate memory map callouts to hit the two in the Vic. Though they don't yet do anything. 2016-06-07 19:15:18 -04:00
Thomas Harte
6522530e1c Actually, I'm dithering over whether the 6522 should be an ordinary class or a curiously-recurring template. But it'll need a file, definitely. 2016-06-06 21:56:02 -04:00
Thomas Harte
ca23e2e10a This now proceeds to an ostensibly working basic prompt. Colours are wrong, 6560 is probably very wrong, 6522 is still absent. Hence no cursor. 2016-06-06 20:33:06 -04:00
Thomas Harte
c7c55528e2 Realised that registers appear also to be readable. 2016-06-06 20:29:39 -04:00
Thomas Harte
e8cb674073 Made some attempt at colours, at least. 2016-06-06 20:18:24 -04:00
Thomas Harte
89c87c3e81 Some major hackiness gives the first line of expected text repeating endlessly (as the end of columns is never reached, as that's back to thinking it's 0x7f); I also don't yet know which actor is supposed to do the '+0x8000' (which probably shouldn't be that but might be a pin on the 6560 indicating what sort of value is being fetched, that effects chip select for the various bits of memory?) 2016-06-06 07:47:30 -04:00
Thomas Harte
64539a2b24 Advanced to having some characters displayed, even though they're obviously very much incorrect and the display is still rolling. 2016-06-06 07:35:35 -04:00
Thomas Harte
79e05a2413 Without yet figuring out what vertical sync is meant to do, moved just about far enough forwards to see _something_ that hopefully I can soon discern characters within. 2016-06-05 18:02:49 -04:00
Thomas Harte
444d3b69b6 Made some elementary attempt to hit something like the correct states within the VIC. 2016-06-05 17:06:10 -04:00
Thomas Harte
9e9e50edb1 Added guess on how colour memory and the 12-bit bus possibly works. 2016-06-05 16:28:06 -04:00
Thomas Harte
3be1ce457b Made some attempt at discerning fields. 2016-06-05 14:05:31 -04:00
Thomas Harte
9566c87532 Added enough to the machine that the 6560 can now produce output if it wishes. 2016-06-05 12:11:12 -04:00
Thomas Harte
f922d38ed2 The Vic now captures the ROMs sent to it and has just enough infrastructure to get to a black screen. Progress! 2016-06-05 10:51:07 -04:00