Thomas Harte
635e18a50d
Ensures the MFP requests and receives real-time clocking when needed.
2019-10-30 22:42:06 -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
1135576a3a
Comments in slightly more detail.
2019-10-28 22:12:56 -04:00
Thomas Harte
1d790ec2a9
Adds the option for a clock conversion to JustInTimeActor and slows the MFP's clock rate.
2019-10-28 21:35:10 -04:00
Thomas Harte
0f2d72c436
Ensures receipt of output line changes.
2019-10-28 21:21:53 -04:00
Thomas Harte
4a1fa8fc13
Adds some const qualifiers.
2019-10-28 21:13:42 -04:00
Thomas Harte
95d3b6e79f
Adds a through route for the FDC interrupt line.
2019-10-28 21:13:21 -04:00
Thomas Harte
d44734d105
Attempts a fuller setting of GPIP inputs.
2019-10-27 22:39:21 -04:00
Thomas Harte
1aaa6331a0
Stores and returns video mode.
2019-10-27 22:39:00 -04:00
Thomas Harte
0cb19421e8
Adds prefix to mouse position response.
2019-10-27 21:46:03 -04:00
Thomas Harte
92847037b3
Merge branch 'master' into AtariST
2019-10-27 21:40:51 -04:00
Thomas Harte
0fc191c87d
Switched a few static_cast
to constructor syntax.
2019-10-27 14:21:22 -04:00
Thomas Harte
dc4a0e4e3b
Video only ever reads from RAM, so it can be const *.
...
(it can also be *const, since I set it only once)
2019-10-27 14:09:38 -04:00
Thomas Harte
36a9a5288b
Adds drives to the FDC.
2019-10-26 22:39:11 -04:00
Thomas Harte
ac39fd0235
Starts work on the DMA controller.
2019-10-26 21:33:57 -04:00
Thomas Harte
ecc0cea5a1
Added a potential branch for the newer TOS memory map.
2019-10-26 16:52:06 -04:00
Thomas Harte
eae11cbf17
Adds a dummy response for mouse interrogation.
2019-10-26 16:14:24 -04:00
Thomas Harte
2207638287
Adds hsync and vsync interrupts.
2019-10-25 22:42:13 -04:00
Thomas Harte
872897029e
Attempts a complete wiring of 68901 interrupts.
2019-10-25 22:36:01 -04:00
Thomas Harte
51b4b5551d
Actually, I think the 6850 is active low for interrupts.
2019-10-24 22:37:53 -04:00
Thomas Harte
092a61f93e
Does a better job of having just 512kb.
2019-10-21 23:10:30 -04:00
Thomas Harte
e30ba58e0d
Attempts to wire ACIA interrupt signals into the MFP.
2019-10-21 23:02:30 -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
75c3e2dacd
Adds basic, incomplete dispatcher for the intelligent keyboard.
2019-10-20 23:07:19 -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
313aaa8f95
Silences temporarily.
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
9a8352282d
Mostly but not quite fixes serial work.
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
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
4e5b440145
Attempts mostly to implement 6850 output.
2019-10-20 20:38:55 -04:00
Thomas Harte
97d44129cb
Ensures all 16 data lines reach the video.
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
a59ec9e818
Provides a token something where DMA should be.
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
42ebe06474
Makes an attempt at tracking video sequence points.
2019-10-20 20:38:55 -04:00
Thomas Harte
74fe32da23
Takes a shot at other display outputs.
2019-10-20 20:38:55 -04:00
Thomas Harte
780916551f
Corrects sync generation.
2019-10-20 20:38:54 -04:00
Thomas Harte
305b1211ba
Makes a first attempt to box out the ST display area.
2019-10-20 20:38:54 -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
3bb0bf9e14
Adds some semblance of an AY.
2019-10-20 20:38:54 -04:00
Thomas Harte
87a6d22894
Starts to formalise the ST memory map a little.
2019-10-20 20:38:54 -04:00
Thomas Harte
484a0ceeb8
Starts forming an Atari ST memory map.
2019-10-20 20:38:54 -04:00
Thomas Harte
da1436abd2
Gifts the Atari ST a 68000 and non-functional video.
2019-10-20 20:38:54 -04:00
Thomas Harte
125f781ced
Starts to create an actual shell of a machine.
2019-10-20 20:38:54 -04:00
Thomas Harte
8b397626bf
Adds a route through the static analyser to the Atari ST.
2019-10-20 20:38:54 -04:00
Thomas Harte
0da1881a07
Adds an Atari ST enumeration and factory method.
2019-10-20 20:38:54 -04:00
Thomas Harte
95c45b5515
This can be const.
2019-10-20 17:22:56 -04:00
Thomas Harte
735586f5f8
Corrects tabs; adds potential output_border optimisation.
2019-10-19 21:20:34 -04:00
Thomas Harte
3c146a3fb2
Adds missing Master System enumerations.
2019-09-30 21:10:30 -04:00
Thomas Harte
4ac3839185
Seeks to ensure that card transitions between real-time and just-in-time don't break timing.
2019-09-28 18:34:04 -04:00
Thomas Harte
fbf95ec2b8
Removes the now empty local namespace.
2019-09-24 22:48:47 -04:00
Thomas Harte
077c7d767f
Shifts essential modifiers up to the Keyboard class.
...
I had forgotten that mappers are not exposed.
2019-09-22 13:48:50 -04:00
Thomas Harte
a416bc0058
Adds an interface allowing keyboard mappers to declare modifiers that are 'essential'.
...
i.e. ones that, if not delivered reliably, will cause the related machine to behave unexpectedly.
2019-09-22 13:14:09 -04:00
Thomas Harte
5f16fa8c08
Removes dead reference to video from VIAPortHandler.
2019-09-21 17:39:45 -04:00
Thomas Harte
e7bf0799b6
Implements every-other-cycle-during-pixels RAM timing.
2019-09-21 17:25:20 -04:00
Thomas Harte
2e24da4614
Implements quick booting, and edges towards exposing it on the Mac.
...
It should already work in kiosk mode.
2019-09-19 22:32:12 -04:00
Thomas Harte
e46601872b
Establishes that the Macintosh offers the quick-boot option.
2019-09-19 21:50:39 -04:00
Thomas Harte
776b819a5a
Adds the SCSI bus as an Activity::Source.
2019-09-19 19:31:22 -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
243e40cd79
Adds signalling of DACK.
2019-09-14 13:48:33 -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
318cdb41ea
Adds SCSI bus clocking to the Macintosh, and fixes its internal counting.
2019-09-02 16:03:33 -04:00
Thomas Harte
2f8e31bc8b
Takes a first bash at implementing the new SCSI::Bus timing infrastructure.
2019-09-02 13:00:01 -04:00
Thomas Harte
1a60ced61b
Starts trying to deal with creating a whole volume from merely a partition.
2019-08-25 23:03:54 -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
90cf99b626
Takes a wild swings at speeding up startup.
...
With no success.
2019-08-18 22:40:16 -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
0f67e490e8
Adjusts NCR address decoding to produce a more plausible initial interaction.
2019-08-11 22:43:25 -04:00
Thomas Harte
895c315fa5
Increases the Mac Plus too 4mb.
2019-08-11 21:41:12 -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
bbd4e4d3dc
Enhances memory map fidelity to allow for ROM holes on the Mac Plus.
...
This is how the ROM detects the difference between the Plus and the 512ke, it seems.
2019-08-10 23:53:34 -04:00
Thomas Harte
bac0461f7f
Switches the drive-speed accumulator to the delegate pattern.
...
This allows the Macintosh to ensure that the IWM is kept up just-in-time with drive speed changes.
2019-08-07 21:39:23 -04:00
Thomas Harte
f26a200d78
Switches to a JustInTimeActor to wrap the IWM.
...
Also simplifies potential future usage of the IWM template.
2019-08-07 21:28:02 -04:00
Thomas Harte
0e293e4983
Relocates RAM delay test in order to scrape out a minor performance win.
2019-08-03 21:46:45 -04:00
Thomas Harte
478f2533b5
Corrects 68000 address bus during interrupt acknowledge.
...
All unused bits should be 1, not 0.
2019-08-03 15:38:36 -04:00
Thomas Harte
a07488cf1b
Introduces the Mac Plus memory map.
...
Albeit with no SCSI support yet.
2019-08-02 22:26:40 -04:00
Thomas Harte
d67c5145c0
Introduces RAM access delays.
2019-08-02 22:12:34 -04:00
Thomas Harte
5e76d593af
Switches to table-based address decoding.
2019-08-02 21:30:04 -04:00
Thomas Harte
b93f9b3973
Distinguishes time advancement from bus response.
2019-08-02 19:48:41 -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
c8177af45a
Introduces missing implementation file.
2019-08-02 16:26:08 -04:00
Thomas Harte
97eff5b16d
Formally distinguishes Macintosh keys from virtual keys.
...
Also: adds mappings for keypad keys, and corrects a couple of
long-standing capitalisation errors in my virtual key set.
2019-08-02 16:15:34 -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
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
f3dd4b028d
Rolls out JustInTime acting to the MSX and ColecoVision.
2019-07-29 21:22:31 -04:00
Thomas Harte
9859f99513
Adds a route to not bumping time.
2019-07-29 17:21:27 -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
fcee7779b0
Inserts missing spaces.
2019-07-22 23:11:37 -04:00
Thomas Harte
b4191b6225
Corrects DiskII boot ROM CRCs and improves corresponding declarations.
2019-07-22 23:07:23 -04:00
Thomas Harte
dbee37ab34
Provides extended ROM details for the VIC-20 and Oric.
2019-07-22 22:15:44 -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
b2a6682798
Adds extended ROM information for the ZX80 and '81.
2019-07-20 22:46:49 -04:00
Thomas Harte
f3aac603f8
Adds extended Introduces extended ROM details for the C1540, Electron, Master System and MSX.
2019-07-20 21:30:37 -04:00
Thomas Harte
712cb473f7
Adds extended ROM information for the CPC and ColecoVision.
2019-07-20 17:07:59 -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
20670bab2f
Expands information included in ROM load requests.
2019-07-19 22:35:22 -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
a0321aa6ff
Starts sketching out an emulator interface for mice.
2019-06-11 17:47:24 -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
Thomas Harte
8c5d37b6ee
Refactors the AppleII into a sub-namespace to make room for other Apple machines.
2019-05-03 18:14:10 -04:00
Thomas Harte
3cb042a49d
Corrects the carry and extend flags for various long-word operations.
2019-04-21 22:08:18 -04:00
Thomas Harte
c0861c7362
Removes hard-coded assumption about disk ROM list placement.
2019-04-16 11:22:03 -04:00
Thomas Harte
c11a1f9679
Introduces S-Video support for the ColecoVision.
2019-03-02 23:02:37 -05:00
Thomas Harte
d97348dd38
Eliminates dangling uses of printf
.
2019-03-02 18:07:05 -05:00
Thomas Harte
e1ebb7ce9c
Ensures no attempt to call nullptr
.
2019-03-02 17:37:56 -05:00
Thomas Harte
d5b4ddd9e5
Simplifies use_fast_tape_ logic.
2019-03-02 14:54:26 -05:00
Thomas Harte
ef085e3f93
MSX: introduces a tape motor LED, and limits the fast-tape hack to the BIOS.
2019-03-01 18:49:21 -05:00
Thomas Harte
3862a93ff9
Removes mapping of the equals key to break.
...
... because I keep pressing it by accident.
2019-02-28 21:47:12 -05:00
Thomas Harte
816ad0a94c
Introduces region support to the MSX.
2019-02-28 20:54:43 -05:00