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192 Commits

Author SHA1 Message Date
Thomas Harte
260843e5b1 Starts poking at a pure total-based formula. 
On the assumption that any relevant DC offset will fall out in the wash. This causes one 400kb disk to boot in a Macintosh 128kb, another couple to do reasonably well. So it's better than what was here before.
 2019-07-31 12:42:23 -04:00
Thomas Harte
e3f22e5787 This should actually be PWM, I think. 
I'm just unsure of exactly the proper formula, owing to my ignorance on basic electrical engineering. Research ahoy!
 2019-07-30 22:02:41 -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
5149f290d0 Starts trying to formalise just-in-time execution. 
Which, at least, simplifies Cycle/HalfCycle to Cycle run_for usage via template.
 2019-07-28 21:49:54 -04:00
Thomas Harte
f894d43111 Removes the video and audio base address latches. 
It now seems to me that these take effect immediately.
 2019-07-27 22:23:40 -04:00
Thomas Harte
d8bc20b1ab Ensures quieter Release behaviour. 2019-07-25 22:55:27 -04:00
Thomas Harte
109d5d16bd Withdraws optimisation, for further testing in the future. 2019-07-25 10:33:38 -04:00
Thomas Harte
1672dc5946 Reduces frequency of update_video() calls. 2019-07-25 10:14:52 -04:00
Thomas Harte
0469f0240b Moves interrupt level selection outside the loop. 2019-07-23 23:13:03 -04:00
Thomas Harte
2432151bf8 Puts machine name into ROMMachine::ROM. 
Also switches to idiomatic exit codes.
 2019-07-22 21:14:21 -04:00
Thomas Harte
3c68a5ca65 Enhances the amount of ROM information posted by the Apple machines. 2019-07-20 16:08:40 -04:00
Thomas Harte
b9a34bee51 Substitutes a more efficient inner loop for audio generation. 2019-07-17 14:54:06 -04:00
Thomas Harte
22ee51c12c Corrects clocking issues around audio, and cuts down queue costs. 2019-07-17 14:41:36 -04:00
Thomas Harte
59b5dfddec Added logic to allow a second disk to be inserted, at least. 2019-07-11 23:03:02 -04:00
Thomas Harte
cac97a9663 Devolves drive responsibility. 2019-07-10 22:39:56 -04:00
Thomas Harte
2ccb564a7b Throws some extra logging into place, to test the IWM changeover. 2019-07-10 21:39:45 -04:00
Thomas Harte
d1d0430fce Eliminates the SonyDrive class. 2019-07-10 17:38:05 -04:00
Thomas Harte
be251d6b03 Begins substituting the DoubleDensityDrive for the Sony. 2019-07-10 16:24:48 -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
886946cc8c Rejigs time-until-event tracking. 2019-07-09 23:27:27 -04:00
Thomas Harte
ed4ddcfda8 Reduces call/return overhead on Microcycle methods. 2019-07-09 19:55:30 -04:00
Thomas Harte
7886cd63bd Flattens the Macintosh's perform_bus_operation, for legibility. 2019-07-09 19:49:06 -04:00
Thomas Harte
b4a3f66773 Restores just-in-time processing of video. 2019-07-09 18:08:07 -04:00
Thomas Harte
52e96e3d2a Documents and extends the Video interface. 
With the intention of returning it soon to JIT execution.
 2019-07-08 22:28:05 -04:00
Thomas Harte
1a9aa60bf7 Ensures no compiler will think this can exit without returning. 2019-07-08 18:13:23 -04:00
Thomas Harte
793c2df7ee Fixes keypad keys. 2019-07-08 16:38:06 -04:00
Thomas Harte
28de629c08 Fixes the 6522 sufficiently to fix keyboard input. 2019-07-08 15:29:34 -04:00
Thomas Harte
d7329c1bdd Experiments with a timeout on keyboard interactions. 2019-07-07 14:13:55 -04:00
Thomas Harte
96c0253ee2 Fixes mouse input when a button is pressed; attempts keyboard input. 
I think the VIA is somehow sending spurious commands.
 2019-07-02 21:14:33 -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
fffe6ed2df Chops the Macintosh down to a single drive to aid in development. 2019-07-02 13:59:30 -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
d81053ea38 Invents some additional PEA tests, and further fixes PEA. 2019-06-27 17:59:03 -04:00
Thomas Harte
506276a2bd Corrected: use format tag as intended. 2019-06-18 14:04:28 -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
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
5630141ad7 Ensures randomised memory contents at startup. 2019-06-13 13:35:16 -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
c8066b01b6 Restores attempt at proper audio behaviour. 2019-06-11 19:53:22 -04:00
Thomas Harte
ebd59f4dd3 Performs the trivial part of wiring up the Macintosh mouse. 
SCC still to go.
 2019-06-11 19:52:37 -04:00
Thomas Harte
109953ef49 Ensures proper routing of mouse events from Cocoa. 2019-06-11 18:41:41 -04:00
Thomas Harte
124c7bcbb0 Makes the Macintosh a mouse machine, and makes mouse machines detectable. 2019-06-11 18:21:56 -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
697e094a4e Sketches out the absolute basics of an SCC interface. 2019-06-08 18:47:11 -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
833258f3d7 Sets things up to allow variable rotation rates, and especially Sony 800kb-style self-selecting rates. 2019-06-04 21:41:54 -04:00
Thomas Harte
661fe1e649 Disables logging, for now. 2019-06-03 15:57:53 -04:00
Thomas Harte
85298319fa Expands towards supporting multiple Macintosh models. 
To provide another variable to help with bug isolation.
 2019-06-03 14:50:36 -04:00
Thomas Harte
881feb1bd3 Adds preliminary parsing of the Disk Copy 4.2 format. 2019-06-02 13:39:25 -04:00
Thomas Harte
3e9fa63799 Adds a receiver for drive-motor control bytes. 
My new belief is that I'm either reading the buffer from the wrong place, or the 68000 isn't filling it for some reason.
 2019-06-01 19:31:32 -04:00
Thomas Harte
983407896c Ensures consistent audio pipeline. 2019-06-01 17:29:57 -04:00
Thomas Harte
5c08bb810e In theory provides a full implementation of audio. 
Albeit seemingly ineffective.
 2019-06-01 15:44:29 -04:00
Thomas Harte
17635da812 Pushes Mac audio further towards being able to function. 2019-06-01 15:18:27 -04:00
Thomas Harte
6d985866ee All proper inputs are now provided to the audio generator. 
Hopefully. The next job is to generate audio. If that sounds correct, then the disk motor speed question can be tackled.
 2019-06-01 15:03:15 -04:00
Thomas Harte
723137c0d4 With some time additions to the 6522, starts wiring in Macintosh audio. 
The audio buffer is also the disk motor buffer, so this is preparatory to further disk work.
 2019-06-01 14:39:40 -04:00
Thomas Harte
4632be4fe5 Wires up the final IWM signal, SEL, preparatory to an implementation. 2019-05-30 12:08:00 -04:00
Thomas Harte
0848fc7e03 Ensures the Mac uses auto vectored interrupts. 2019-05-28 16:24:41 -04:00
Thomas Harte
5e2496d59c Simplifies and corrects MOVE logic. 2019-05-28 15:17:03 -04:00
Thomas Harte
1d3dde32f2 Ensures final byte of data can be accessed. 2019-05-09 07:24:26 -04:00
Thomas Harte
41740fb45e Implements video position feedback. 
At a substantial performance cost for now, but I'll worry about that once things are working.
 2019-05-08 16:54:19 -04:00
Thomas Harte
0ad88508f7 Removes ROM mirroring above $600000. 2019-05-08 15:07:03 -04:00
Thomas Harte
8b72043f33 Ensures no uninitialised variables. 2019-05-08 14:54:54 -04:00
Thomas Harte
f0f9722ca6 Takes a first crack at the keyboard's serial protocol. 
Albeit that without a working shift register in the VIA, this shouldn't really work yet.
 2019-05-08 14:20:28 -04:00
Thomas Harte
b5ef88902b Edges further towards a functioning keyboard. 2019-05-08 13:58:52 -04:00
Thomas Harte
7b466e6d0a Begins work on a functioning keyboard. 2019-05-08 12:34:26 -04:00
Thomas Harte
7e6d4f5a3e Adds emulation of the real-time clock. 2019-05-08 00:12:19 -04:00
Thomas Harte
ce099a297a Eliminates RAM writes in ROM area. 
I no longer think that logic is correct.
 2019-05-07 17:16:22 -04:00
Thomas Harte
949c848815 Broadens address decoding. 
To no obvious change in output.
 2019-05-06 22:57:29 -04:00
Thomas Harte
9bf9b9ea8c Ensures unmapped peripherals return a consistent value. 2019-05-06 21:32:10 -04:00
Thomas Harte
a131d39451 I now believe only the 6522 is on the synchronous bus. 2019-05-06 14:10:13 -04:00
Thomas Harte
b540f58457 Sets a more appropriate display type. 2019-05-05 23:22:05 -04:00
Thomas Harte
4f5a38b5c5 Adds support for the alternate video buffer. 2019-05-05 23:05:24 -04:00
Thomas Harte
cefc3af08b Corrects RAM read decoding when the ROM overlay is enabled. 2019-05-05 22:48:40 -04:00
Thomas Harte
96facc103a Adds an IWM shim and corrects graphics output. 
... now that there is some.
 2019-05-05 21:55:34 -04:00
Thomas Harte
407bbfb379 Pretending the Disk II is an IWM doesn't seem to achieve much. 2019-05-05 18:12:25 -04:00
Thomas Harte
a99ebda513 Takes a first shot at (inverted) Mac video output. 2019-05-04 22:27:58 -04:00
Thomas Harte
537b604fc9 It looks like writes should always go to RAM. 
Now I see the screen buffer being filled with `0xffff`s, along with what is probably disk motor control data.
 2019-05-04 17:29:30 -04:00
Thomas Harte
98bc570bf7 Adds further boilerplate around VIA and IWM decoding. 2019-05-04 17:12:26 -04:00
Thomas Harte
181b77c490 Adds decoding of IWM accesses and respect for the ROM overlay bit. 2019-05-04 16:38:01 -04:00
Thomas Harte
bc9eb82e6f Adds in VIA access decoding, and a note to self on video. 
The Mac now proceeds to try to talk to the IWM.
 2019-05-04 14:23:37 -04:00
Thomas Harte
29fc024ecd Starts negotiating the Macintosh memory map. 2019-05-04 12:33:27 -04:00
Thomas Harte
c1695d0910 Adds various notes to self. 2019-05-03 23:55:28 -04:00
Thomas Harte
6d6a4e79c9 Adds the absolute basics to include a 6522 in the Macintosh. 
Not yet wired to anything.
 2019-05-03 23:40:22 -04:00
Thomas Harte
68392ce6f5 Adds enough of a concept of Mac video to get a properly initialised display. 
Completely empty at present, naturally. Also this is the very first time I've run my 68000 at live speed. From just one data point, it's not terrible. Phew!
 2019-05-03 23:25:42 -04:00
Thomas Harte
6873f62ad8 Ensures that the Mac now retains its ROM properly. 2019-05-03 22:39:09 -04:00
Thomas Harte
5f385e15f6 Adds the bare bones necessary to be able to create a Macintosh from File -> New... . 2019-05-03 22:16:07 -04:00