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7,581 Commits 8 Branches 121 Tags 496 MiB
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210 Commits

Author SHA1 Message Date
Thomas Harte
abb350ff5b Stubs in audio toggle and disk control. 
It appears that ROM 01 now fails because reading the disk interface register doesn't do as expected. ROM 03 starts hitting what should be the IWM and dies in a surplus of logging.
 2020-11-09 22:21:52 -05:00
Thomas Harte
dc8d4d49f5 Gives the two sets of switches responsibility for supplying 'state'. 
(And fixes language-card state value.)
 2020-11-09 22:11:20 -05:00
Thomas Harte
54352cb1cb Stubs in a couple more registers. 
PC now hits $0000. Likely a bug.
 2020-11-09 21:54:25 -05:00
Thomas Harte
7e106c6add Attempts to stub in read from microcontroller, and extends command 0x06. 
A complete guess on the latter, as if you didn't know.
 2020-11-09 21:20:53 -05:00
Thomas Harte
0ae49b356a Seems to do enough padding out to get me to my second failing ADB command. 
That's better than failing at the first.
 2020-11-09 19:05:48 -05:00
Thomas Harte
32374444ba Fixes text output window. 2020-11-08 17:04:04 -05:00
Thomas Harte
287bfeb924 Hacks in 40-column text. 
Hot gossip: my IIgs is reporting a system error. A clue!
 2020-11-08 17:01:23 -05:00
Thomas Harte
3bb3d8c5c1 Adds text colour register. 
Oddly this isn't currently being set. So probably another latent fault elsewhere.
 2020-11-07 23:14:50 -05:00
Thomas Harte
b57a2bfec9 Completes logic for pixel framing. Well, mostly; this doesn't yet allow for auxiliary-using II modes being off to the left. 
The perceived effect though is that a frame appears and then freezes. So a clocking issue may still be afoot.
 2020-11-07 22:23:48 -05:00
Thomas Harte
a51f4122f0 Attempts to respect border colour. 
Though for now my display is just a sea of purple.
 2020-11-07 22:03:05 -05:00
Thomas Harte
35ba5fc894 Resolves video timing issues. 2020-11-07 21:28:08 -05:00
Thomas Harte
228d901253 Attempts to stabilise image horizontally. 2020-11-07 21:10:05 -05:00
Thomas Harte
d37ba62343 Makes first, faltering steps towards video display. 2020-11-07 20:42:34 -05:00
Thomas Harte
699fb0aa4b Switches to just-in-time video, for easy access to a clock divider. 2020-11-07 19:40:26 -05:00
Thomas Harte
613d4b7c8b Migrates character ROM handling; supplies one for the IIgs. 2020-11-07 17:45:03 -05:00
Thomas Harte
6b29e1f598 Corrects accesses to switch values. 2020-11-05 21:25:06 -05:00
Thomas Harte
6c9edbb7a2 Resolves specious interrupts.dic 2020-11-05 20:51:00 -05:00
Thomas Harte
282d0f1ebb For debugging, adds a dump of anything in the [presumably] text buffer. 
Nothing is there.
 2020-11-05 18:17:21 -05:00
Thomas Harte
f466cbadec Attempts to do just enough with video to get a functioning vertical blank query. 2020-11-05 17:56:20 -05:00
Thomas Harte
46ee98639e Stubs in $c010. 
Also reduces memory map logging.
 2020-11-04 21:35:11 -05:00
Thomas Harte
cc6c0d535c Stubs in some of the sound GLU registers. 2020-11-04 21:29:44 -05:00
Thomas Harte
78b57e73d5 Hacks in a lying vertical blank value. 2020-11-04 21:18:27 -05:00
Thomas Harte
9e2a6526d1 Corrects interpretation of bit 3 of the state register. 
And attempts to be a bit more careful with the language card in general.
 2020-11-04 21:15:10 -05:00
Thomas Harte
d3c7253981 Shifts size-limiting of X and Y to transitions and mutations, away from reads. 
Primarily to remove potential bug-causing complexity — this is easier to debug. But let's see.
 2020-11-04 20:35:41 -05:00
Thomas Harte
0178aaee2b Attempts retroactively to enforce the rule that 8-bit index modes => no top byte. 
(Rather than a preserved but ignored top byte)
 2020-11-02 18:55:28 -05:00
Thomas Harte
53f60f7c87 Adds some notes for a pending ADB implementation. 2020-11-01 14:49:04 -05:00
Thomas Harte
2da71acefd Stubs in the ADB GLU. 2020-10-31 21:00:15 -04:00
Thomas Harte
45f5896b76 Stubs video switches into the IIgs. 2020-10-31 20:39:32 -04:00
Thomas Harte
531a3bb7e6 Ensures RAM is zero-initialised, for now, to aid in repeatable bug finding. 2020-10-31 20:03:23 -04:00
Thomas Harte
e4459b6256 Adds power-on bit to speed register. 2020-10-30 21:50:39 -04:00
Thomas Harte
2be817a6a1 Maps in "the interrupt ROM addresses". 2020-10-30 21:42:43 -04:00
Thomas Harte
a833bb892b Increases logging substantially. 2020-10-30 20:11:55 -04:00
Thomas Harte
0d562699a2 Ensures unmapped regions are really unmapped. 2020-10-29 22:18:01 -04:00
Thomas Harte
034056d0cd Adds full 8-bit clock addressing; stubs clock into the IIgs. 2020-10-29 21:38:36 -04:00
Thomas Harte
5a8b8478d2 Corrects unhandled IO assert. 
The IIgs proper is actually waiting on communication with the RTC.
 2020-10-28 22:14:02 -04:00
Thomas Harte
6c54699c44 Connects up an SCC. 
Thereby putting my IIgs into its first perpetual loop. Trying to do something with the SCC I haven't implemented yet perhaps?
 2020-10-28 22:07:34 -04:00
Thomas Harte
94a6da6b7d Exposes much of the auxiliary and language card stuff to the IIgs bus. 2020-10-28 21:58:20 -04:00
Thomas Harte
885fae1534 Stubs in a speed register. 2020-10-28 21:23:45 -04:00
Thomas Harte
1e4679ae14 Corrects JSL and RTL. 2020-10-28 17:25:40 -04:00
Thomas Harte
267dd59a59 Gets as far as seemingly yet another memory-map setting. 
Tomorrow, maybe?
 2020-10-27 22:31:58 -04:00
Thomas Harte
0a91ac5af5 Adds some extra notes, starts getting into trying to run the IIgs. 2020-10-27 22:09:45 -04:00
Thomas Harte
ad93ad6018 Attempts to finish off shadowing. 2020-10-27 22:05:04 -04:00
Thomas Harte
0c700094ea Goes branchless on shadowing. 2020-10-27 21:56:03 -04:00
Thomas Harte
20631a157b Contorts somewhat in pursuit of branchless shadowing regardless of page and without extra storage. 2020-10-27 21:37:39 -04:00
Thomas Harte
e44f95a882 Takes a first, faltering shot at shadowing. 2020-10-27 19:49:47 -04:00
Thomas Harte
31cd45f8b5 Takes a run at set_card_paging and simplifies method of shadowing. 2020-10-27 19:33:47 -04:00
Thomas Harte
74f9f6ad3b Tests and corrects ROM access beyond bank $00. 2020-10-27 19:02:15 -04:00
Thomas Harte
1dfdb51e61 Hits a few other easy cases. 
Still to do: card paging, and finding out which banks that applies to, and shadowing. So: everything with flags.
 2020-10-26 21:49:47 -04:00
Thomas Harte
18832dc19d Attempts to expand the language card stuff to all affected pages. 2020-10-26 20:30:41 -04:00
Thomas Harte
3dee0666cb Corrects current bank $00 language card behaviour. 2020-10-26 17:46:40 -04:00
Thomas Harte
f830f6a57a Adds failing test of initial ROM mirroring. 
It's the end of the evening, so this is it for today.
 2020-10-25 22:13:54 -04:00
Thomas Harte
82c733c68c Adds some very basic actual tests. 2020-10-25 21:40:50 -04:00
Thomas Harte
ed510409c4 Starts memory map test class, already finding a typo. 2020-10-25 21:31:21 -04:00
Thomas Harte
7614eba4bf Factors out the IIgs memory map logic. 
As testing would be rational.
 2020-10-25 21:10:04 -04:00
Thomas Harte
13c8032465 ROM isn't writeable. The clue is in the name. 2020-10-25 18:29:17 -04:00
Thomas Harte
44fc08cd5b Switches to a mapping system that supports non-continuous regions, and is smaller. 2020-10-25 18:28:32 -04:00
Thomas Harte
ddd84db510 Edges towards a functioning IIgs memory map. 
Next up: making sure language and auxiliary switches apply. That should get something from the ROM.
 2020-10-23 19:41:10 -04:00
Thomas Harte
817f93a490 Edges towards a working memory subsystem. At least structurally. 2020-10-22 19:25:04 -04:00
Thomas Harte
43611792ac Adds just enough to get a 65816 ticking over. 2020-10-21 21:19:18 -04:00
Thomas Harte
5287c57ee0 Adds the IIgs as a user-selectable machine. 
Albeit that there is no underlying machine yet.
 2020-10-20 22:18:11 -04:00