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1055 Commits

Author SHA1 Message Date
Thomas Harte
99fa86a67e Adds a test for lookup sine. And fixes lookup sine. 2020-04-20 18:40:47 -04:00
Thomas Harte
6568c29c54 Improves commentary. 2020-04-19 22:42:25 -04:00
Thomas Harte
c54bbc5a04 Rename Table.h; LogSin -> LogSign and make it a bit more typer. 2020-04-19 13:33:17 -04:00
Thomas Harte
92d0c466c2 Moves complete phase -> output calculation inside Operator. 
Reasoning being: otherwise I wasn't currently enforcing non-sine waveforms.
 2020-04-19 13:27:24 -04:00
Thomas Harte
020c760976 Simplifies the phase counter. 2020-04-19 00:30:14 -04:00
Thomas Harte
cdfd7de221 Minor: enables all melodic channels when rhythm mode is disabled; supports non-modulated channels. 2020-04-18 17:48:29 -04:00
Thomas Harte
3da2e91acf Adjusts range of output, makes declaration of level full owner of type information. 2020-04-17 23:29:09 -04:00
Thomas Harte
3948304172 Attempts to use table-based maths. 2020-04-17 23:23:16 -04:00
Thomas Harte
4a295cd95e Wraps log_sin in an access function to enshrine sign and mask rules; switches both functions to non-math.h clashing names. 2020-04-17 23:22:42 -04:00
Thomas Harte
6f7c8b35c5 Applies an ahead-of-time transformation to the exp table, and wraps it in a helper function. 2020-04-17 22:33:13 -04:00
Thomas Harte
e58ba27c00 Clarifies meaning of scaling. Though it isn't yet applied. 2020-04-17 22:30:10 -04:00
Thomas Harte
0aceddd088 Starts tidying up the OPL2. 
This is as a precursor to switching to using the proper table lookups, which I hope will automatically fix my range issues.
 2020-04-15 22:10:50 -04:00
Thomas Harte
30ff399218 With some fixes for scale, I think possibly this is close for melodic channels. 2020-04-15 21:27:27 -04:00
Thomas Harte
a7e63b61eb Just from printing numbers: corrects transition from attack to decay. 2020-04-15 00:26:01 -04:00
Thomas Harte
b13b0d9311 Starts towards implementing some OPL test cases. 2020-04-14 23:51:45 -04:00
Thomas Harte
d8380dc3e2 Tries to be a little neater in spelling out the work here. 
I think I'm somewhat circling here now; I need to think of a way of getting clean comparison data.
 2020-04-14 21:55:42 -04:00
Thomas Harte
d805e9a8f0 Actually, octave probably works this way around? Higher octaves = higher frequencies. 2020-04-14 21:39:12 -04:00
Thomas Harte
aa45142728 Endeavours to fix attenuation and add FM synthesis. 
I now definitely think my frequency counting is wrong.
 2020-04-14 18:32:06 -04:00
Thomas Harte
09d1aed3a5 Attempts to voice the current attenuation (and, therefore, the ADSR output), even if linearly rather than logarithmically. 2020-04-13 22:12:55 -04:00
Thomas Harte
a1f80b5142 Takes a stab at per-operator ADSR. 
Heavy caveats apply: no KSR is applied, non-ADSR attenuation isn't applied, attenuation isn't voiced in general.
 2020-04-13 21:39:06 -04:00
Thomas Harte
d3fbdba77c Add missing #include. 2020-04-12 14:20:02 -04:00
Thomas Harte
632d797c9d Adjusts frequency formula. This could be close. 
I guess next I need to get ADSR/volume in general working, before I can go FM? Then I'll worry about using the proper log-sin/exp tables.
 2020-04-12 14:15:09 -04:00
Thomas Harte
559a2d81c1 Baby step: starts trying to output the raw FM carrier, no modulation, no ADSR. 2020-04-12 12:46:40 -04:00
Thomas Harte
7a5f23c0a5 Adds accommodations for the OPLL. 2020-04-10 22:05:22 -04:00
Thomas Harte
84b115f15f Attempts to move forward in defining what the parts of an OPL are meant to do. 2020-04-10 19:13:52 -04:00
Thomas Harte
a0d14f4030 Starts trying to make sense of the various fields at play. 2020-04-08 23:15:44 -04:00
Thomas Harte
dd6769bfbc Splits OPLL and OPL2 classes. 
Logic is: they have different mixers (additive in the OPL2, time-division multiplexing in the OPLL) as well as different register sets. So I'll put operator and channel logic directly into those structs.
 2020-04-07 23:15:26 -04:00
Thomas Harte
db4b71fc9a Adds correct LSFR, something of OPLL -> OPL2 logic. 2020-04-05 22:57:53 -04:00
Thomas Harte
0ed7d257e1 Add some extra notes, implement correct mapping to only 18 operators. Not 22. 2020-04-05 14:32:55 -04:00
Thomas Harte
335a68396f Attempts to complete OPL2 register decoding. 2020-04-04 23:39:09 -04:00
Thomas Harte
84cdf6130f Starts at least trying to decode OPL2 register writes. 2020-04-04 23:29:25 -04:00
Thomas Harte
b0abc4f7bb Implements enough wiring that the Master System will instantiate and talk to an OPLL. 2020-04-03 20:05:36 -04:00
Thomas Harte
a7e1920597 Restores ColecoVision runtime options. 2020-03-18 00:06:52 -04:00
Thomas Harte
394ee61c78 Starts a switch to reflectable-style runtime options. 
The Amstrad CPC and ZX80/81 have made the jump so far, subject to caveats. The macOS build is unlikely currently to work properly.
 2020-03-16 23:25:05 -04:00
Thomas Harte
545a6177bb Makes CompoundSource mono/stereo-aware. 2020-02-16 18:45:36 -05:00
Thomas Harte
50d356be2f Ensures all audio sources, including compound sources, announce whether they're stereo correctly. 2020-02-16 18:31:45 -05:00
Thomas Harte
9835e800ec Fixed: individual audio generators now either are or are not stereo. The speaker acts accordingly. 2020-02-16 18:28:03 -05:00
Thomas Harte
337cb4fb86 Resolves implicit type conversion warnings. 2020-02-16 14:05:23 -05:00
Thomas Harte
f760a68173 Corrects stereo audio generation. 2020-02-16 00:19:49 -05:00
Thomas Harte
89d6b85b83 Adds optional stereo output for the AY. 
The real chip provides the three tone channels as separate outputs, so a variety of different mixings can exist.
 2020-02-15 18:09:17 -05:00
Thomas Harte
e02d109864 Nudges the LowpassSpeaker towards supporting stereo generation. 2020-02-15 18:03:12 -05:00
Thomas Harte
dde672701f
Merge pull request #755 from TomHarte/ExpliticLambdas 
Tries to be less lazy with lambda captures.
 2020-02-15 12:38:12 -05:00
Thomas Harte
9ca2d8f9f2 Tried to be less lazy with lambda captures. 
This is primarily defensive.
 2020-02-14 23:39:08 -05:00
Thomas Harte
763159a6f6 More neatly ties volume level 0 to silence. 2020-02-14 23:16:10 -05:00
Thomas Harte
6810a6ee58 Adjusts the AY volume scale. 
Hopefully more accurately to model the real thing.
 2020-02-14 22:51:20 -05:00
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