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564 Commits

Author SHA1 Message Date
Thomas Harte
03ef81b07c Attempts to reduce initial bounce. 2021-03-23 17:12:00 -04:00
Thomas Harte
0f9ab53ea0 Resolves GCC warnings from dangling Apple IIgs work. 2021-03-21 22:36:18 -04:00
Thomas Harte
67408521cd Makes absolutely sure not to try to use quickboot workaround for Mac 128kb/512kb. 
Albeit that it should be harmless; it's just seeding RAM.
 2021-03-06 22:34:35 -05:00
Thomas Harte
7b164de6fd Reenables interrupts. 2021-03-06 18:53:39 -05:00
Thomas Harte
24e68166c6 Minor clean-ups of my temporary cruft. 2021-03-06 17:11:06 -05:00
Thomas Harte
b72474f418 Reduces debugging shout outs a touch. 2021-03-03 20:53:05 -05:00
Thomas Harte
38046d49aa Increases debugging noise. 2021-03-03 20:52:14 -05:00
Thomas Harte
4601421aa6 This conditional is gone. 2021-03-03 20:52:01 -05:00
Thomas Harte
2f45e07d82 Further consolidates region map, now that shadowing is orthogonal. 2021-02-28 15:22:36 -05:00
Thomas Harte
496b6b5cfc Introduces a further 128 bits of storage to eliminate the conditional in IsShadowed. 2021-02-28 15:14:32 -05:00
Thomas Harte
8604b1786e Simplifies banks $02+ to a single region. 2021-02-27 23:34:51 -05:00
Thomas Harte
267e28e012 Adds various bits of debugging detritus. 2021-02-27 22:27:57 -05:00
Thomas Harte
631a8a7421 Adds bitset header. 2021-02-27 22:13:49 -05:00
Thomas Harte
7dcb0553e4 Switches to a target-centric view of shadowing. 2021-02-27 22:13:10 -05:00
Thomas Harte
2a7ea9f57c Merge branch 'master' into AppleIIgs 2021-02-26 21:31:18 -05:00
Thomas Harte
9781460c41 Thanks to a hint from the MAME guys: finally completes Macintosh 128kb and 512kb emulation (!) 2021-02-26 21:22:35 -05:00
Thomas Harte
55c9d152e9 Slightly smarter: this does branchless shadowing without additional storage. 2021-02-24 18:46:41 -05:00
Thomas Harte
6cf9099ce1 Don't clear the mouse data full flag until both registers have been read. 2021-02-23 21:57:02 -05:00
Thomas Harte
e6dc39f6f0 Makes an attempt at mouse event transmission. 2021-02-19 22:48:15 -05:00
Thomas Harte
28ce675c96 Takes a further stab at ::CommandDataIsValid. 2021-02-19 22:22:14 -05:00
Thomas Harte
3d91b0a31b Fixes keyboard data return. 
Input sort of works now! Except that key repeat is way out of control.
 2021-02-19 21:55:06 -05:00
Thomas Harte
5d1970d201 Adds a hacky different guess at how register access might work. 2021-02-19 21:46:18 -05:00
Thomas Harte
72d7901c88 Takes a shot at the keyboard data full flag. 
Just a guess. But likely?
 2021-02-19 20:06:12 -05:00
Thomas Harte
60cfec6a65 Amongst ever more cruft, adds a couple of extra asserts. 2021-02-18 22:49:48 -05:00
Thomas Harte
2e9065b34c Increases number of fixed initial values. 2021-02-18 22:48:53 -05:00
Thomas Harte
e42843cca0 This may temporarily exhaust my wit for asserts. 2021-02-16 22:47:46 -05:00
Thomas Harte
3336a123f8 Asserts even more overtly. 2021-02-16 22:33:28 -05:00
Thomas Harte
28bd620e7f Adds joystick support to the IIgs. 2021-02-16 19:39:22 -05:00
Thomas Harte
b117df3367 Factors out joystick logic. 2021-02-16 19:17:32 -05:00
Thomas Harte
fa8236741d Takes a shot at an ADB mouse. 2021-02-15 20:49:16 -05:00
Thomas Harte
e16d5f33d1 Adds service requests. The microcontroller now appears to consume keyboard events. 2021-02-15 20:33:10 -05:00
Thomas Harte
e773b331cd Implements register 2 listen. 2021-02-15 15:05:46 -05:00
Thomas Harte
99c21925f4 Makes attempt at keyboard mapping. 2021-02-15 15:00:12 -05:00
Thomas Harte
eccf5ca043 Makes first effort to wire up the ADB vertical blank input. 
However: looking at the disassembly, I'm not sure it really is wired to INTR. So work to do.
 2021-02-14 22:20:58 -05:00
Thomas Harte
24af62a3e5 Sets a default handler of 1. 2021-02-14 22:20:07 -05:00
Thomas Harte
52cf15c3e6 Attempts to route out modifier state. 2021-02-14 21:15:31 -05:00
Thomas Harte
a791680e6f Implements set_status as per advice. 2021-02-14 21:04:20 -05:00
Thomas Harte
6e53b4c507 Corrects centralised ADB decoder. 
I still think it's appropriate to do this in only a single place, given that using it is optional.
 2021-02-14 20:41:05 -05:00
Thomas Harte
52c38e72f6 Starts seeking to automate register 3 handling. 
Immediate pitfall: byte capture on the bus side isn't working correctly.
 2021-02-14 20:37:33 -05:00
Thomas Harte
a51d143c35 Corrects reactive-device transmission logic. 
Albeit that I'm still not properly responding to register 3 stuff, so the ADB bus needn't believe anything is out there. Also, without VSYNC being piped to the microcontroller it may well just not be polling anyway.
 2021-02-14 18:54:22 -05:00
Thomas Harte
17e9305282 Starts adding a keyboard. 2021-02-13 23:16:45 -05:00
Thomas Harte
c284b34003 Resolves inability of ADB microcontroller to read its own ROM (!) 2021-02-13 17:53:40 -05:00
Thomas Harte
2ab3bba695 Attempts GLU register latching, restoring expected startup sequence. 2021-02-13 17:38:42 -05:00
Thomas Harte
2c4dcf8843 Edges towards implementing an ADB device. 2021-02-12 21:50:24 -05:00
Thomas Harte
ea40b2c982 Takes a stab at implementing device response. 2021-02-12 18:56:43 -05:00
Thomas Harte
adfdfa205f Starts to establish the means by which I'll implement ADB devices. 2021-02-12 18:42:12 -05:00
Thomas Harte
33abdc95aa Adds a helper for decoding ADB commands. 
Still very noticeably to do: any sort of standard part for devices to respond to the bus.
 2021-02-10 21:39:33 -05:00
Thomas Harte
6ca8aa99fc Commit SDL and Qt project files; improve commenting. 2021-02-10 21:28:32 -05:00
Thomas Harte
17bac4c8cf Starts to formalise the ADB bus. 2021-02-10 21:24:31 -05:00
Thomas Harte
46bd20b5e0 Attempts to simplify ADB bit parsing. 
On-line output still looks reasonable, albeit that the microcontroller suddenly seems to be interested in devices F and 3 rather than 2 and 3.
 2021-02-08 22:08:49 -05:00
Thomas Harte
93a80a30d3 With correct divider appears to get reset requests posted. 2021-02-07 23:05:01 -05:00
Thomas Harte
77b1efd176 Sets sensible 'reset' values. 2021-02-07 21:53:57 -05:00
Thomas Harte
acfab1dfb3 Starts to make some effort at timers. 2021-02-06 21:02:44 -05:00
Thomas Harte
b8c6d4b153 Rips out my high-level ADB microcontroller protocol implementation. 
Adds just enough that the main computer validates the ADB controller as present and talking.
 2021-01-30 17:53:27 -05:00
Thomas Harte
f50e8b5106 If I'm going to maintain the max_address approach, & is 'correct'. 
% +1 would be 'more correct', but I think this approach is probably misguided.
 2021-01-27 18:31:11 -05:00
Thomas Harte
dcc2fe0990 Improves M50470 entry-point detection, adds test output. 2021-01-26 21:29:17 -05:00
Thomas Harte
56111c75ae Makes first efforts towards disassembly. 2021-01-26 19:52:30 -05:00
Thomas Harte
fc4bda0047 Experimentally flipping interpretation of the output bit gives something closer to coherent. 2021-01-25 22:02:39 -05:00
Thomas Harte
c8beb59172 Attempts properly to track ADB bus activity. 
Output is not yet a valid ADB stream. Work to do.
 2021-01-25 17:43:22 -05:00
Thomas Harte
8789ffda15 Corrects performer storage, RMW/W confusion, implicit casts, port readback. 2021-01-24 22:30:42 -05:00
Thomas Harte
e8e604dc3c Attempts to wire up M50470 and GLU. 
Resulting in an unexpected interest in R15. Bugs to find, I guess.
 2021-01-24 18:07:05 -05:00
Thomas Harte
57e0fdfadc Ensures ADB microcontroller is clocked. 
And runs at the 'correct' speed (i.e. modulo my instruction-by-instruction implementation).
 2021-01-23 22:55:12 -05:00
Thomas Harte
ec0018df79 Routes in the ADB keyboard ROM. This should get as far as parsing. 2021-01-18 16:59:49 -05:00
Thomas Harte
12784a71e2 A stab in the dark: does the IOLC inhibit also affect vector fetches? 2020-12-29 20:53:56 -05:00
Thomas Harte
114d48b076 This register appears to be read/write. 2020-12-11 21:43:34 -05:00
Thomas Harte
6e9d517c26 Minor cleanliness improvement. 2020-12-11 21:43:13 -05:00
Thomas Harte
159924dcc0 More clarity tweaks. 2020-12-10 22:47:11 -05:00
Thomas Harte
5d8f284757 Makes minor style improvements. 2020-12-10 22:11:53 -05:00
Thomas Harte
c978a95463 Increases asserts and adds a test. 
Thereby discovers and fixes a problem with set_main_paging().
 2020-12-10 21:49:23 -05:00
Thomas Harte
1928c955d9 Ensures safe startup of the Ensoniq. 2020-12-09 19:46:32 -05:00
Thomas Harte
049a78c667 Slightly restricts video flushing test. 2020-12-08 18:47:15 -05:00
Thomas Harte
65ca931e83 Throws in a new assert, against the unimplemented bit 0 of new video. 2020-12-06 20:26:24 -05:00
Thomas Harte
6cb71eb11b This needs explicitly to be a bool for the table lookups to work. 2020-12-06 16:43:07 -05:00
Thomas Harte
43251193ee The actual maximum line length is now 656. 2020-12-06 16:42:43 -05:00
Thomas Harte
55de98fb46 Adds a new statement of intent. 
Now I need to try to decide whether I like my current all-in-one mapping for shadowing + paging, or whether it's better to split the things. I'm tending towards the latter at least until the functionality works.
 2020-12-05 19:09:21 -05:00
Thomas Harte
1422d43c35 Corrects documentation errors and ambiguities. 2020-12-05 19:07:38 -05:00
Thomas Harte
6273ef8ba2 Adds means to force specific ROM 03 self tests. 2020-12-02 20:48:19 -05:00
Thomas Harte
3c6f09a898 Corrects super high-res aspect ratio and placement. 2020-12-02 20:47:26 -05:00
Thomas Harte
24fcb0c24b Corrects video counter values. 
The built-in speed test now passes.
 2020-12-01 18:35:55 -05:00
Thomas Harte
03e2b6a265 Makes a slightly more rigorous attempt at discerning 1Mhz and 2.8Mhz operation. 2020-12-01 17:46:30 -05:00
Thomas Harte
ee22cf7ca1 Ensures that PAGE2 propagates from the state register to video. 2020-11-30 22:56:19 -05:00
Thomas Harte
187f507532 The soft switch is LCBANK2, not LCBANK1. 
[This also jimmys the IIgs into always entering its extended self test, for now]
 2020-11-30 22:35:51 -05:00
Thomas Harte
6000bd3a5e Adds a bonus debugging assert. Let's see. 2020-11-30 18:15:02 -05:00
Thomas Harte
87069da3dd Improves exposition, eliminates a couple of redundant map adjustments. 2020-11-30 18:07:03 -05:00
Thomas Harte
5cb4077576 Switches from modulo to and. 2020-11-30 17:47:57 -05:00
Thomas Harte
e9c7e0b9dd Provisionally reverses meaning of language card RAM bank select. 2020-11-29 21:57:17 -05:00
Thomas Harte
35aa7612bb Ensures that auxiliary/language-card soft switches don't trigger my assert. 2020-11-29 21:32:24 -05:00
Thomas Harte
acaa841822 Adds guaranteed trip to ROM for vector pulls. 2020-11-29 21:29:15 -05:00
Thomas Harte
46c1c9b5ee CLRVBLINT calls it 3.75Hz. Which makes the arithmetic nicer. 2020-11-29 21:25:06 -05:00
Thomas Harte
4bdbca64b2 Takes a shot at the Mega II-style video interrupts. 2020-11-29 21:21:46 -05:00
Thomas Harte
11fe8ab6db Corrects counter scales, adds a read for $c032. 
Albeit that I have no idea what that's supposed to read as.
 2020-11-29 20:08:59 -05:00
Thomas Harte
a9ce43d244 Takes a shot at the two video counter registers. 2020-11-29 19:57:35 -05:00
Thomas Harte
091bce9350 Merge branch 'master' into AppleIIgs 2020-11-29 00:09:20 -05:00
Thomas Harte
a965c8de9f Resolves intended reset_all_keys. 2020-11-27 21:53:34 -05:00
Thomas Harte
79ef026b93 Allows machines to declare a preference for logical input. 
It's only a preference, and the Apple II does prefer it.
 2020-11-27 21:00:48 -05:00
Thomas Harte
a4ab5b0b49 Does a better job of ensuring sensible key mappings. 2020-11-27 20:49:38 -05:00
Thomas Harte
310282b7c9
Ensures extra_border_length always has a defined value. 2020-11-27 10:31:04 -05:00
Thomas Harte
af667c718e Gets a bit more rigorous in remaining missing parts. 2020-11-26 22:36:32 -05:00
Thomas Harte
950f5b1691 Closes the loop on interrupts. 2020-11-26 19:56:42 -05:00
Thomas Harte
cbc0d848ad Implements most of get_data. 2020-11-26 17:25:27 -05:00
Thomas Harte
f4d13d1f6f Takes a run at the bus side of honouring Ensoniq sequence points. 2020-11-26 17:14:46 -05:00
Thomas Harte
6808ad6f5d Adds a getter for the interrupt line. 2020-11-26 16:44:35 -05:00
Thomas Harte
7a8920ee38 Takes a stab at next_sequence_point. 2020-11-26 16:41:11 -05:00
Thomas Harte
4870506f6e Implements skip_audio. 2020-11-26 16:24:48 -05:00
Thomas Harte
6f47f9d67c Corrects placement of address bits. 2020-11-26 16:15:40 -05:00
Thomas Harte
8093f67173 Ensures video interrupts can't be missed by a suitably-timed access. 2020-11-26 16:11:03 -05:00
Thomas Harte
72884f37c3 It's still interrupt-deficient, but fills in additional Ensoniq audio generation. 2020-11-26 16:03:28 -05:00
Thomas Harte
8edb3fcd5f Attempts to obey accumulator size in determining sample end. 2020-11-26 15:07:29 -05:00
Thomas Harte
fdd102df52 Resolves border colour resets. 2020-11-26 13:13:48 -05:00
Thomas Harte
03a893dc74 Quick refactor: this clearly isn't a VideoBase, it's the full implementation. 2020-11-26 12:54:20 -05:00
Thomas Harte
56de2512ae Adds a further safety assert. 2020-11-25 23:34:30 -05:00
Thomas Harte
cdc2311045 Enables fuzzing, adds a definite no-op write. 2020-11-25 23:33:55 -05:00
Thomas Harte
eec27c3406 Reaches for marginally more coherent ADB data. 2020-11-25 17:34:00 -05:00
Thomas Harte
098a22aa95
Avoid out-of-bounds access of double_bytes. 2020-11-24 09:38:07 -05:00
Thomas Harte
7ede3d2b9e Corrects collection of palettes other than palette 0. 2020-11-23 21:00:26 -05:00
Thomas Harte
e7160fe3c3 Rounds out the IIgs video hardware, bugs aside. 2020-11-23 20:58:32 -05:00
Thomas Harte
9d61665014 Attempts to add colour double [low/high] resolution output. 2020-11-23 19:05:18 -05:00
Thomas Harte
d2938ad7c8 Eliminate magic constants. 2020-11-23 18:36:44 -05:00
Thomas Harte
46f7ff07f7 Adds support for fill mode. 2020-11-22 21:55:21 -05:00
Thomas Harte
a34f294ba8 Pulls out commonalities re: NTSC colour, ensures mixed modes on a line works. 2020-11-22 21:29:40 -05:00
Thomas Harte
cd7d080b7a Corrects low-resolution mode. 2020-11-22 20:52:42 -05:00
Thomas Harte
b0936b6ef4 Resolves high-resolution output. 
Yet to optimise, but working.
 2020-11-22 19:10:05 -05:00
Thomas Harte
8fae74f93e Reintroduces delay bit, reverses phase. 
There are stray columns of errors, but otherwise this is almost correct.
 2020-11-22 11:06:14 -05:00
Thomas Harte
fca48e4b66 Makes hasty attempt to shift 'NTSC' in the most natural direction. 2020-11-21 23:39:58 -05:00
Thomas Harte
3b2ea37428 Slightly cleans up. 2020-11-21 22:53:26 -05:00
Thomas Harte
3cba3a5ac0 Corrects card mask test outside of bank $00. 2020-11-21 22:22:27 -05:00
Thomas Harte
4b024c5787 Starts to make some attempt at classic II modes. 2020-11-21 18:07:51 -05:00
Thomas Harte
4a42de4f18 Attempts to add 5.25" drive support to the IIgs. 
I want to try some classic software.
 2020-11-20 21:37:17 -05:00
Thomas Harte
d00e5d23ef Takes a second shot at the MemoryWrite constructor complaint. 2020-11-19 22:28:10 -05:00
Thomas Harte
2c9ce116a2 Resolves various GCC-reported issues. 2020-11-19 22:21:20 -05:00
Thomas Harte
3512352c32 Attempt to use the most-significant relevant bits for sample position. 2020-11-19 22:13:09 -05:00
Thomas Harte
4d9372c52f Also takes a stab at swap mode. 2020-11-19 21:56:49 -05:00
Thomas Harte
1d288b08b6 Attempts the two most basic forms of DOC output. 
Sans interrupts. Or register reads of any variety.
 2020-11-19 21:19:27 -05:00
Thomas Harte
f3c7c11772 Register writes now reach the audio thread. 2020-11-18 21:52:03 -05:00
Thomas Harte
4b9fe805e9 Sets up a queue to push memory writes onto the audio thread. 2020-11-18 21:40:56 -05:00
Thomas Harte
a7051e4e42 Strip this forceinline until I've satisfied myself that it works in declarations. 2020-11-18 21:40:25 -05:00
Thomas Harte
34794223b4 For now, at least, c800–cfff is always built-in ROM. 
Otherwise I probably need to extend my c3 logic to cover the other built-in cards (?)
 2020-11-18 19:49:45 -05:00
Thomas Harte
96cf617ee6 Advances slightly. I think I need a custom queue for RAM writes. 2020-11-18 19:48:53 -05:00
Thomas Harte
69dddf34b9 Adds bonus sanity check. 2020-11-18 19:47:56 -05:00
Thomas Harte
8f4597f742 Hacks in double text. 
Actually, only one error: it should start half a column earlier. All 'double' output should. TODO.
 2020-11-18 19:47:22 -05:00
Thomas Harte
98347cb1c3 Starts in the direction of audio support. 2020-11-18 18:39:11 -05:00
Thomas Harte
62f936128d It seems possibly there is a distinct IIgs character ROM? 2020-11-16 22:22:26 -05:00
Thomas Harte
bb80e53021 Reduces frequency of video flushes. 2020-11-16 21:55:41 -05:00
Thomas Harte
952891d1b6 Improves commentary. 2020-11-16 21:46:35 -05:00
Thomas Harte
6dfad6a44b Slightly reduces logging. 
Hopefully soon I can tear the whole lot out.
 2020-11-16 21:46:19 -05:00
Thomas Harte
e4c5bfdd5c Takes a repeat shot at proper shadowing. 
I think the Apple IIgs Technical Reference explains how these bits interact, and I just had inhibit_all_pages off all on my own.
 2020-11-16 19:54:12 -05:00
Thomas Harte
9a55eb56ea Attempts to provide saner sequence point behaviour. 2020-11-16 19:00:11 -05:00
Thomas Harte
9206ab5dc3 Adds notes to self; implements get_next_sequence_point for video, allowing per-line interrupts. 2020-11-16 14:42:50 -05:00
Thomas Harte
7e39550fc0 Attempts to make JustInTimeActor sequence-point aware. 
With the objective of chopping out a lot of future boilerplate.
 2020-11-15 21:58:18 -05:00
Thomas Harte
c3f5fbd300 Picks a better framing compromise for classic and new video modes. 2020-11-15 19:14:43 -05:00
Thomas Harte
1db713fec1 Attempts more meaningful super high-res pixel output. 
With a timing hack as noted.
 2020-11-15 18:36:24 -05:00
Thomas Harte
68ba73bee0 Ensures I get some sort of feedback for non-text modes. 2020-11-15 17:16:52 -05:00
Thomas Harte
cdacf280e1 After much extra logging, corrects destination bank for MVN and MVP. 2020-11-15 16:08:29 -05:00
Thomas Harte
1538a02e18 Better explains concern. 2020-11-14 19:27:20 -05:00
Thomas Harte
f9cec9a102 Attempts also to implement 1Mhz access costs. 
Subject to TODO, and same observation as before: this is as to my current understanding only.
 2020-11-14 19:23:01 -05:00
Thomas Harte
adda3d8f42 Attempts a 'full' model of 2.8Mhz access timing. 
i.e. full to my current understanding.
 2020-11-14 19:10:41 -05:00
Thomas Harte
ec3ff0da12 Steps towards proper calculation of time. 2020-11-14 18:39:16 -05:00
Thomas Harte
73c38b3b0d Collapses nested conditionals. 2020-11-14 18:23:31 -05:00
Thomas Harte
edc8050b36 Adds activity indicators. 2020-11-14 18:00:06 -05:00
Thomas Harte
715a1b9cd6 Ensures safe shutdown. 2020-11-12 21:44:51 -05:00
Thomas Harte
86310849eb Corrects IWM clocking. 2020-11-12 18:09:31 -05:00
Thomas Harte
a2a928e262 Takes a guess at the format of IIgs .po files; wires them through to the actual machine. 
... which still declines to boot.
 2020-11-12 18:01:26 -05:00
Thomas Harte
3813e00ca3 Adds the Apple II toggle speaker. 2020-11-11 21:04:38 -05:00
Thomas Harte
5698aa6499 Corrects colour mapping and improves documentation for self. 2020-11-11 20:41:30 -05:00
Thomas Harte
a15af1df5e Attempts to use the other bit of disk drive control, the 5.25"/3.5" select. 
For the record, the ROM thinks it finds some Smartport devices and then attempts to talk to them. Since none is present, it blocks forever.
 2020-11-11 17:55:50 -05:00
Thomas Harte
da9e378ab1 Quietens, for now. 2020-11-11 17:53:21 -05:00
Thomas Harte
8024bbd721 Provides minor extra detail. 2020-11-11 17:08:56 -05:00
Thomas Harte
ece9382a4e Also attaches IWM select line. 2020-11-10 18:59:23 -05:00
Thomas Harte
6ba517a4c1 Applies a will-do-for-now crop to video output. 2020-11-10 18:50:23 -05:00
Thomas Harte
20fd5adb24 Makes a first effort at attaching an IWM. 2020-11-10 18:38:23 -05:00
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
81c38c7200 Per the IIgs tech note, this value works the other way around. 2020-11-07 23:15:07 -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