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1010 Commits

Author SHA1 Message Date
Thomas Harte
294e09f275 All these 'override's can be 'final's. 
At least for the purpose of being communicative. I doubt there's much to gain in terms of compiler output — the DiskImageHolder can avoid some virtual lookups but nothing else leaps out.
 2020-01-23 22:57:51 -05:00
Thomas Harte
9d97a294a7 Corrects the TMS' get_scaled_scan_status. 
I think all platforms are now returning credible numbers.
 2020-01-22 19:34:10 -05:00
Thomas Harte
a71c5946f0 Ensures proper manipulation of scan_statuses, leading to the correct result out of a CRTMachine. 
Possibly with the exception of the TMS, as I appear to have uncovered an unrelated issue there.
 2020-01-21 22:28:25 -05:00
Thomas Harte
d97a073d1b Adds the necessary routine for all machines to be able to respond to get_scan_status. 
They all just as the CRT, as all are currently based on the CRT. Which doesn't currently know the total clock rate it would need to in order properly to scale the answer to the question. Further thought coming.
 2020-01-20 21:45:10 -05:00
Thomas Harte
c755411636 Slightly improves comments. 2020-01-19 20:05:22 -05:00
Thomas Harte
d674fd0e67 The WD uses only the low two bits for sector size. 2020-01-18 13:40:50 -05:00
Thomas Harte
aac3d27c10 Adds activity indicators for the BD-500 and Jasmin. 
Also slightly cleans up DiskController a little further.
 2020-01-15 23:39:15 -05:00
Thomas Harte
2d233b6358 Makes a more concrete attempt at track/sector combination. 2020-01-12 22:18:31 -05:00
Thomas Harte
6a44936a7c Ensures programmatic volume level 0 is completely off. 2020-01-05 22:44:52 -05:00
Thomas Harte
c1bae49a92 Standardises on read and write for bus accesses. 
Logic being: name these things for the bus action they model, not the effect they have.
 2020-01-05 13:40:02 -05:00
Thomas Harte
153f60735d Banishes redefined macro warning. 2020-01-01 12:38:30 -05:00
Thomas Harte
e59de71d79 Disables status logging, at least until next needed. 2019-12-24 21:44:50 -05:00
Thomas Harte
4205e95883 Switches to capture of the track 0 flag during a type 1 operation. 2019-12-24 21:43:20 -05:00
Thomas Harte
dfa6b11737 Adds responsibility for an ongoing index pulse to the drive. 2019-12-24 20:53:37 -05:00
Thomas Harte
42926e72cc Adjusted: Flag::WriteProtect works in real time for a type-1 status. 2019-12-24 19:57:12 -05:00
Thomas Harte
80cb06eb33 It provisionally seems as though spin_up should be reset by a force interrupt? 2019-12-24 19:37:37 -05:00
Thomas Harte
0dae608da5 Embraces std::make_[unique/shared] in place of .reset(new . 2019-12-23 21:31:46 -05:00
Thomas Harte
ac604b30f3 Eliminates dangling static_casts in favour of construction. 2019-12-22 20:59:20 -05:00
Thomas Harte
b035b92f33 Corrects accidental use of sector contents as addresses in multi-sector reads and writes. 
As a secondary defect, this was also causing erroneous CRC error reports.
 2019-12-22 19:58:02 -05:00
Thomas Harte
d25b48878c Cleans up READ_ID macro, inter alia. 2019-12-22 17:58:33 -05:00
Thomas Harte
274867579b Deploys constexpr as a stricter const. 2019-12-22 00:22:17 -05:00
Thomas Harte
a847654ef2 Corrects various old-fashioned bits of indentation, plus the odd const. 2019-12-22 00:00:23 -05:00
Thomas Harte
57ce10418f Switches prescale logic, the better to deal with changes in prescaler. 
According to my assumptions about the behaviour, anyway.
 2019-12-20 23:33:14 -05:00
Thomas Harte
2a1520c04e Removes mostly-uninformative piece of logging. 2019-12-19 22:58:28 -05:00
Thomas Harte
45a391d69e Increases quantity of annotations. 
I'm now at almost 500 lines, and I haven't even really written anything yet.
 2019-12-18 22:57:12 -05:00
Thomas Harte
15bc18b64f Merge branch 'master' into FurtherSCC 2019-12-18 22:17:10 -05:00
Thomas Harte
206ab380c7 Introduces double-resolution envelopes for the Atari ST. 2019-12-18 22:03:02 -05:00
Thomas Harte
d85ae21b2f Adds an explicit declaration of chip type to all AY users. 2019-12-18 19:28:41 -05:00
Thomas Harte
7d9bedf7de Merge branch 'master' into FurtherSCC 2019-12-17 22:39:39 -05:00
Thomas Harte
c2646a415f Switch to faster timer implementation; it seems to work. 2019-12-09 19:23:08 -05:00
Thomas Harte
7cd11ecb7f Adds necessary #include for assert. 2019-12-08 22:43:39 -05:00
Thomas Harte
acfe2c63b8 Adds an assert to verify the interrupt line is clear after a full reset. 2019-12-08 22:34:19 -05:00
Thomas Harte
b192381928 Implements a fuller reset, takes a run at the overran flag. 2019-12-08 21:20:06 -05:00
Thomas Harte
7ff57f8cdf Starts to flesh out documentation. 2019-11-19 22:32:07 -05:00
Thomas Harte
06edeea866 Adds reload during event count mode. 
Plus a helpful bit of TODO.
 2019-11-19 22:24:32 -05:00
Thomas Harte
e0ceab6642 Pivots towards looking at Timer B as a cause of in-frame inaccuracy. 2019-11-19 21:52:50 -05:00
Thomas Harte
0ce5057fd9 Attempts to factor in event counting direction. 2019-11-18 22:37:20 -05:00
Thomas Harte
6ec3c47cc0 Ensures same-level interrupts don't double trigger. 2019-11-12 22:18:13 -05:00
Thomas Harte
d6edfa5c6d Removes the redundant state encased within interrupt_causes_. 2019-11-11 21:49:02 -05:00
Thomas Harte
072b0266af It seems status reads are not required to clear the interrupt line. 2019-11-09 20:12:09 -05:00
Thomas Harte
5fc4e57db7 Eliminates non-portable use of fls. 2019-11-09 16:03:00 -05:00
Thomas Harte
e3abbc9966 Renames what didn't end up being a whole SerialPort. 2019-11-09 15:21:51 -05:00
Thomas Harte
8c736a639a Eliminates unexpected bottleneck created by ACIA. 2019-11-09 15:00:12 -05:00
Thomas Harte
14e790746b Fixes return value when reading received data. 2019-11-02 21:25:00 -04:00
Thomas Harte
75e34b4215 Reacts to no acknowledgement. 2019-10-31 21:00:05 -04:00
Thomas Harte
a5bbf54a27 Adds the ability for the 68901 to decline an interrupt acknowledgement. 2019-10-31 19:57:36 -04:00
Thomas Harte
731dc350b4 Adds sometime real-time clocking for DMA. 2019-10-30 22:59:32 -04:00
Thomas Harte
635e18a50d Ensures the MFP requests and receives real-time clocking when needed. 2019-10-30 22:42:06 -04:00
Thomas Harte
4857ceb3eb Attempts to get a bit more systematic. 
Spotted that interrupt_enable_ isn't being used properly while doing so, hopefully that's now correct.
 2019-10-29 23:16:08 -04:00
Thomas Harte
1c154131f9 Expands size of storage in Cycles/HalfCycles; adjusts widely to compensate. 2019-10-29 22:36:29 -04:00
Thomas Harte
fd02b6fc18 Corrects in-service test; adds pending clearing upon enabled clearing. 2019-10-28 22:51:00 -04:00
Thomas Harte
553f3b6d8b Properly conforms to GPIP input/output blending. 2019-10-28 22:37:11 -04:00
Thomas Harte
a5057e6540 Ensures that stop means stop. 2019-10-28 22:12:45 -04:00
Thomas Harte
aa52652027 Adds a const. 2019-10-28 21:21:35 -04:00
Thomas Harte
5f6711b72c Ensures interrupt changes are notified to the delegate. 2019-10-28 21:13:06 -04:00
Thomas Harte
de1bfb4e24 Stores and returns timer configuration. 2019-10-27 22:38:49 -04:00
Thomas Harte
0082dc4411 Improves logging. 2019-10-27 00:02:55 -04:00
Thomas Harte
22754683f8 Ensures timer divisor values don't go out of range, adds timer interrupts. 
I suspect further timer issues remain.
 2019-10-26 23:20:13 -04:00
Thomas Harte
e89be6249d Adds a logging prefix. 2019-10-26 22:38:56 -04:00
Thomas Harte
e96386f572 Takes another stab at MFP interrupt management. 2019-10-26 15:55:19 -04:00
Thomas Harte
a8d481a764 Writes to the pending register appear to be able to clear interrupts too. 2019-10-25 22:46:30 -04:00
Thomas Harte
872897029e Attempts a complete wiring of 68901 interrupts. 2019-10-25 22:36:01 -04:00
Thomas Harte
7a2de47f58 Corrects interrupt mask generation. 2019-10-24 22:37:32 -04:00
Thomas Harte
f2f98ed60c Attempts some part of interrupt decision making. 2019-10-24 22:33:42 -04:00
Thomas Harte
77f14fa638 Starts trying to make sense of interrupts. 2019-10-23 23:09:49 -04:00
Thomas Harte
f09a240e6c Gives myself more trace details. 2019-10-21 23:20:03 -04:00
Thomas Harte
e30ba58e0d Attempts to wire ACIA interrupt signals into the MFP. 2019-10-21 23:02:30 -04:00
Thomas Harte
7cb82fccc0 Attempts properly to maintain interrupt flag; adds delegate. 2019-10-21 22:40:38 -04:00
Thomas Harte
ed9a5b0430 Adds receipt interrupt. 2019-10-21 21:27:57 -04:00
Thomas Harte
8f59a73425 Corrects incoming data capture. 2019-10-21 20:18:52 -04:00
Thomas Harte
91223b9ec8 Sets default level to high. 2019-10-21 20:18:33 -04:00
Thomas Harte
83f5f0e2ad Begins trying to receive ACIA data. 2019-10-21 20:10:19 -04:00
Thomas Harte
cf37e9f5de Remove source control markers. 2019-10-20 23:40:51 -04:00
Thomas Harte
e4f7ead894 Merge branch 'AtariST' of github.com:TomHarte/CLK into AtariST 2019-10-20 23:40:01 -04:00
Thomas Harte
4134463094 The ACIA now receives bits. 2019-10-20 23:34:30 -04:00
Thomas Harte
83d73fb088 The keyboard now responds to a reset on its serial line. 2019-10-20 23:13:44 -04:00
Thomas Harte
cf07982a9b Ensures good serial line and ACIA behaviour. 
Next stop: having the intelligent keyboard react.
 2019-10-20 22:10:05 -04:00
Thomas Harte
2e86dada1d Ensures updates even when the event queue is empty. 2019-10-20 20:38:56 -04:00
Thomas Harte
696af5c3a6 Starts to transfer serial line decoding logic into the line itself. 2019-10-20 20:38:56 -04:00
Thomas Harte
f08b38d0ae Silences, temporarily. 2019-10-20 20:38:55 -04:00
Thomas Harte
9a8352282d Mostly but not quite fixes serial work. 2019-10-20 20:38:55 -04:00
Thomas Harte
3d03cce6b1 Starts working on the GPIP functionality block. 2019-10-20 20:38:55 -04:00
Thomas Harte
34075a7674 Attempts to tie an intelligent keyboard to the other end of its serial line. 2019-10-20 20:38:55 -04:00
Thomas Harte
f79c87659f Corrects documentation error. 2019-10-20 20:38:55 -04:00
Thomas Harte
c10b64e1c0 Adds a received_data_ register, that presently can never fill. 2019-10-20 20:38:55 -04:00
Thomas Harte
5d5fe52144 Corrects transmission logic — exactly hitting write_data_time_remaining now works properly. 2019-10-20 20:38:55 -04:00
Thomas Harte
d461331fd2 Ensures remaining_delays_ is set properly after [reset/flush]_writing. 2019-10-20 20:38:55 -04:00
Thomas Harte
ff62eb6dce The ACIA actually has two clocks, though on an ST they're both 500,000 Hz. 2019-10-20 20:38:55 -04:00
Thomas Harte
374439693e Ensures serial lines know their writer's clock rate. 2019-10-20 20:38:55 -04:00
Thomas Harte
c4ef33b23f JustInTimeActors can now specify a clock divider. 2019-10-20 20:38:55 -04:00
Thomas Harte
a7ed357569 Attempts to implement transmission interrupts and ClockingHint::Source. 2019-10-20 20:38:55 -04:00
Thomas Harte
4e5b440145 Attempts mostly to implement 6850 output. 2019-10-20 20:38:55 -04:00
Thomas Harte
2bd7be13b5 Decodes the 6850 control register, and starts working on standardised serial ports. 2019-10-20 20:38:55 -04:00
Thomas Harte
4b09d7c41d Nudges 6850 towards coherence. 2019-10-20 20:38:55 -04:00
Thomas Harte
b0f5f7bd37 Attempts to start producing actual video. 2019-10-20 20:38:55 -04:00
Thomas Harte
4ead905c3c Adds an empty shell for the ACIA. 2019-10-20 20:38:55 -04:00
Thomas Harte
127bb043e7 Adds enough logic to advance to an ACIA access error. 2019-10-20 20:38:55 -04:00
Thomas Harte
2cf52fb89c Makes an unsuccessful first attempt at some timer functionality. 2019-10-20 20:38:54 -04:00
Thomas Harte
6e1b606adf Adds a target for MFP read/write operations. 
Completely without any implementation, so far.
 2019-10-20 20:38:54 -04:00
Thomas Harte
e095a622d3 Ensures updates even when the event queue is empty. 2019-10-17 23:59:43 -04:00
Thomas Harte
9ab49065cd Starts to transfer serial line decoding logic into the line itself. 2019-10-17 23:34:39 -04:00
Thomas Harte
ab50f17d87 Silences, temporarily. 2019-10-16 23:34:49 -04:00
Thomas Harte
f5a2e180f9 Mostly but not quite fixes serial work. 2019-10-16 23:34:37 -04:00
Thomas Harte
f2e1584275 Starts working on the GPIP functionality block. 2019-10-16 23:21:25 -04:00
Thomas Harte
0fd8813ddb Attempts to tie an intelligent keyboard to the other end of its serial line. 2019-10-16 23:21:14 -04:00
Thomas Harte
b69180ba01 Corrects documentation error. 2019-10-16 23:19:42 -04:00
Thomas Harte
c352d8ae8c Adds a received_data_ register, that presently can never fill. 2019-10-13 23:04:57 -04:00
Thomas Harte
530e831064 Corrects transmission logic — exactly hitting write_data_time_remaining now works properly. 2019-10-13 21:40:46 -04:00
Thomas Harte
3b165a78f2 Ensures remaining_delays_ is set properly after [reset/flush]_writing. 2019-10-13 21:39:25 -04:00
Thomas Harte
8d87e9eb1c The ACIA actually has two clocks, though on an ST they're both 500,000 Hz. 2019-10-13 21:32:34 -04:00
Thomas Harte
f86dc082bb Ensures serial lines know their writer's clock rate. 2019-10-13 20:41:08 -04:00
Thomas Harte
d7982aa84e JustInTimeActors can now specify a clock divider. 2019-10-13 18:19:39 -04:00
Thomas Harte
516d78f5a8 Attempts to implement transmission interrupts and ClockingHint::Source. 2019-10-12 23:46:57 -04:00
Thomas Harte
8b50a7d6e3 Attempts mostly to implement 6850 output. 2019-10-12 23:14:29 -04:00
Thomas Harte
4bf81d3b90 Decodes the 6850 control register, and starts working on standardised serial ports. 2019-10-12 18:19:55 -04:00
Thomas Harte
cd75978e4e Nudges 6850 towards coherence. 2019-10-12 00:04:02 -04:00
Thomas Harte
c5ebf75351 Attempts to start producing actual video. 2019-10-10 22:46:58 -04:00
Thomas Harte
d7ce2c26e8 Adds an empty shell for the ACIA. 2019-10-10 20:54:29 -04:00
Thomas Harte
f88e1b1373 Adds enough logic to advance to an ACIA access error. 2019-10-09 23:01:11 -04:00
Thomas Harte
1de1818ebb Makes an unsuccessful first attempt at some timer functionality. 2019-10-07 22:44:35 -04:00
Thomas Harte
885f890df1 Adds a target for MFP read/write operations. 
Completely without any implementation, so far.
 2019-10-06 23:14:05 -04:00
Thomas Harte
6c99048211 Copies in a few more hardware notes. 2019-10-02 19:18:09 -04:00
Thomas Harte
2638a901d9 Improves documentation of existing degree of implementation. 2019-09-30 21:36:37 -04:00
Thomas Harte
929475d31e Minor correction: round down, not up. 2019-09-28 23:49:32 -04:00
Thomas Harte
7758f9d0a9 Improves nomenclature. 2019-09-24 22:31:36 -04:00
Thomas Harte
8d4a96683a Reduces output noise. 2019-09-18 21:41:29 -04:00
Thomas Harte
f53411a319 Removes local NDEBUG. 2019-09-18 21:35:26 -04:00
Thomas Harte
962275c22a Removes clock for NCR 5380. 
It doesn't have one in real life, and now can live off the time counting that occurs on the SCSI bus.
 2019-09-18 20:17:47 -04:00
Thomas Harte
2f6c366668 Makes a concerted effort at properly wrapping a hard disk image. 2019-09-17 21:30:04 -04:00
Thomas Harte
2ce1f0a3b1 Implements multi-sector read/write. 
This once again unblocks Apple HD SC Setup. Progress!
 2019-09-16 22:20:42 -04:00
Thomas Harte
960b289e70 Edges closer towards proper DMA operation. 
Specifically: differentiates the three kinds of DMA operation. Still doesn't act correctly with regard to DACK though, and leaves the bus instantaneously improperly formed. Which I'm tempted to try to fix on the target side by properly obeying delays.
 2019-09-15 15:03:06 -04:00
Thomas Harte
243e40cd79 Adds signalling of DACK. 2019-09-14 13:48:33 -04:00
Thomas Harte
64dad35026 Decreases logging, at least temporarily. 2019-09-03 22:40:32 -04:00
Thomas Harte
1c7e0f3c9d Fixes control line modification by the 5380 and SCSI target command chaining. 
So now I'm back to trying to guess how a SCSI command terminates re: the relative meanings of a message phase and a status phase.
 2019-09-02 23:14:37 -04:00
Thomas Harte
ca08716c52 Introduces real hard disk images to the nascent world of SCSI. 2019-08-25 17:03:41 -04:00
Thomas Harte
c86db12f1c Starts implementing DMA support on the 5380. 
The Macintosh doesn't actually use the DMA signals, but uses pseudo-DMA mode so they nevertheless need to be appropriate.
 2019-08-24 22:47:11 -04:00
Thomas Harte
2d82855f26 Attempts to provide a data out phase. 2019-08-22 23:16:58 -04:00
Thomas Harte
faec516a2c Starts pushing towards figuring out a proper infrastructure for mass storage. 2019-08-21 23:22:58 -04:00
Thomas Harte
bb1a0a0b76 Sketches out further SCSI infrastructure. 2019-08-21 22:37:39 -04:00
Thomas Harte
252650808d Starts seeking to unbind SCSI bus logic and command performance. 2019-08-19 22:47:01 -04:00
Thomas Harte
e3d9254555 Implements phase-match bit. 
Seemingly causing the command phase to proceed.
 2019-08-18 23:15:54 -04:00
Thomas Harte
955e909e61 Attempts to nudge the command phase further towards functioning. 2019-08-18 22:39:27 -04:00
Thomas Harte
8339e2044c Switches to proper SCSI terminology and better attempts a command phase. 2019-08-18 15:10:07 -04:00
Thomas Harte
0e0c789b02 Starts attempting to introduce a direct access device. 
Without having access to the SCSI-1 standard, a lot of this is guesswork.
 2019-08-17 23:43:42 -04:00
Thomas Harte
7e001c1d03 Corrects data line loading. 
Also adds some extra temporary logging. Outstanding question: why is ATN not being signalled? Is SEL enough?
 2019-08-17 21:30:59 -04:00
Thomas Harte
9047932b81 Corrected basic error. Arbitration now seems to succeed. 
This is seemingly followed by a pattern of signalling BUSY+SEL followed by just SEL with the various other potential device IDs in turn. To which nothing ever responds as currently implemented.
 2019-08-15 23:28:30 -04:00
Thomas Harte
f668e4a54c Makes an attempt at getting the 5380 past arbitration. 
Not entirely successful. Also gets a bit smarter with `final` on ClockingHint::Sources.
 2019-08-15 23:14:40 -04:00
Thomas Harte
ce1c96d68c Starts thinking out the mechanics of emulating a SCSI-1 bus. 2019-08-13 23:09:11 -04:00
Thomas Harte
0f67e490e8 Adjusts NCR address decoding to produce a more plausible initial interaction. 2019-08-11 22:43:25 -04:00
Thomas Harte
a90a74a512 Stubs in just enough of the 5380 to get a Mac Plus too boot. 2019-08-11 20:55:20 -04:00
Thomas Harte
949c1e1668 Adds an empty shell for what will be my 5380 implementation. 2019-08-10 23:53:52 -04:00
Thomas Harte
96005261c7 Adds activity lights for Macintosh disk activity. 
Prompting a quick fix to drives not spinning down.
 2019-08-02 16:26:23 -04:00
Thomas Harte
335dda3d55 Attempts more accurately to match Apple's windowing logic. 2019-08-02 12:49:45 -04:00
Thomas Harte
9bbccd89d3 Adds an extended rationale for current implementation. 
Also strips some cruft of prior guesses.
 2019-07-31 23:19:46 -04:00
Thomas Harte
2aa308efdd Tweaks magic formulas. 
The computer now at least seeks outward, until this attempt at drive speed calculation fails.
 2019-07-30 16:18:36 -04:00
Thomas Harte
74c18d7861 Attempts a full wiring up of 400kb drive speed. 2019-07-30 15:08:55 -04:00
Thomas Harte
a43ada82b2 Experiments with a JustInTimeActor in the Master System. 2019-07-29 15:38:41 -04:00
Thomas Harte
85cf8d89bc Ensures an initial non-zero value. 2019-07-25 21:47:44 -04:00
Thomas Harte
0469f0240b Moves interrupt level selection outside the loop. 2019-07-23 23:13:03 -04:00
Thomas Harte
d69aee4972 Removes stray \n. 2019-07-23 22:17:46 -04:00
Thomas Harte
ee8d853fcb Ensures you can't get a phase 2 for free with run_for(0). 2019-07-17 14:20:27 -04:00
Thomas Harte
67055d8b56 Reduces CheckingWriteProtect costs, negligibly. 2019-07-15 22:39:55 -04:00
Thomas Harte
7baad61746 Attempts a full implementation of asynchronous write mode. 2019-07-15 17:11:12 -04:00
Thomas Harte
1d1e0d74f8 Corrects and introduces new parts. 2019-07-12 21:37:33 -04:00
Thomas Harte
d53d1c616f Continues trying to get to write support. 2019-07-12 21:20:05 -04:00
Thomas Harte
2c39229b13 Adds has-new-disk flag, allowing mounting of software from the desktop. 2019-07-12 13:17:24 -04:00
Thomas Harte
b730ac5d5a Reintroduces 1-second disable implementation. 2019-07-11 23:02:47 -04:00
Thomas Harte
c8917e677b Edging towards implementing IWM write support, but mainly tidied up. 2019-07-11 21:42:34 -04:00
Thomas Harte
cac97a9663 Devolves drive responsibility. 2019-07-10 22:39:56 -04:00
Thomas Harte
be251d6b03 Begins substituting the DoubleDensityDrive for the Sony. 2019-07-10 16:24:48 -04:00
Thomas Harte
6cfaf920ee Added attribution and commentary on rotation speeds. 2019-07-10 16:22:06 -04:00
Thomas Harte
1657f8768c Transfers and slightly extends drive logic into the drive. 2019-07-10 16:17:51 -04:00
Thomas Harte
c4ab0bb867 Starts sketching out an interface for IWM drives, eliminating a dangling use of unsigned as it goes. 2019-07-10 16:05:59 -04:00
Thomas Harte
fb6da1de4a Reduces logging temporarily. 2019-07-08 17:37:15 -04:00
Thomas Harte
245e27c893 Solidifies belief that the shift register bit is cleared on read/write. 2019-07-08 16:45:15 -04:00
Thomas Harte
28de629c08 Fixes the 6522 sufficiently to fix keyboard input. 2019-07-08 15:29:34 -04:00
Thomas Harte
210bcaa56d Introduces an initial shift unit test, and makes it pass. 2019-07-07 22:13:36 -04:00
Thomas Harte
191a7a9386 Reintroduces an empty second drive. 
This prevents the uninitialised disk error. Which is a clue.
 2019-07-02 16:59:00 -04:00
Thomas Harte
b9c2c42bc0 Switches drives to using floats for time counting. 
Hopefully to eliminate a lot of unnecessary `Time` work; inaccuracies should still be within tolerable range.
 2019-07-02 15:43:03 -04:00
Thomas Harte
6c588a1510 Makes some further random swings at tracking the startup procedure. 2019-06-28 13:03:47 -04:00
Thomas Harte
00c32e4b59 Further miscellaneous changes to debug logging. All temporary. 2019-06-18 10:34:31 -04:00
Thomas Harte
877b46d2c1 Advances IWM/drive emulation very close to the point of 'Welcome to Macintosh'. 2019-06-15 16:08:54 -04:00
Thomas Harte
cc7226ae9f Starts trying to get a bit more rigorous about collected meanings. 2019-06-13 22:48:10 -04:00
Thomas Harte
bde975a3b9 Possibly mights the tiniest bit of headway with 'the IWM'. 
I'm now pretty sure that my 3.5" drive, which for now is implemented in the IWM (yuck) is just responding to queries incorrectly.
 2019-06-13 22:38:09 -04:00
Thomas Harte
f6f9024631 Corrects Macintosh aspect ratio (and framing). 2019-06-13 18:41:38 -04:00
Thomas Harte
535747e3f2 Restores single-line logging format. 2019-06-13 13:35:03 -04:00
Thomas Harte
d6150645c0 By hook or by crook, mouse input now works. 2019-06-12 22:19:25 -04:00
Thomas Harte
ccd2cb44a2 Fills in enough of the SCC to allow completion of the Macintosh side of that relationship. 2019-06-12 17:51:50 -04:00
Thomas Harte
ad8b68c998 Switches to a proper form of zero-upon-read data. 
Not that it's necessarily correct.
 2019-06-11 19:53:51 -04:00
Thomas Harte
3c075e9542 Switches drives 0 and 1. 2019-06-10 14:58:39 -04:00
Thomas Harte
9230969f43 Corrects enough of the 6522 and Keyboard to get an initial command seemingly working. 2019-06-10 09:28:27 -04:00
Thomas Harte
0e16c67805 Improves shift register connection, towards having the keyboard function properly. 
It now seems not to receive a command terminator, but is at least getting a command.
 2019-06-08 23:04:55 -04:00
Thomas Harte
697e094a4e Sketches out the absolute basics of an SCC interface. 2019-06-08 18:47:11 -04:00
Thomas Harte
50d37798a2 Eradicates magic constants. 2019-06-06 21:37:43 -04:00
Thomas Harte
e9d0676e75 Fiddles further with the tachometer. 2019-06-06 21:36:19 -04:00
Thomas Harte
7591906777 Numerous IWM fixes: the machine now seems to be trying to measure the tachometer. 2019-06-06 18:32:11 -04:00
Thomas Harte
a413ae11cb Makes some sort of first attempt at having the IWM read. 2019-06-04 22:13:00 -04:00
Thomas Harte
b8a1553368 Adds putative support for PlusToo-style BIN files. 
Albeit a bit of a guess, since it's not intended to be an emulator file format.
 2019-06-04 21:41:09 -04:00
Thomas Harte
8557558bd8 Mildly improves investigatory reporting. 2019-06-03 21:51:45 -04:00
Thomas Harte
abe55fe950 Adds Timer 1 toggling of PB7. 2019-06-03 15:39:20 -04:00