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134 Commits

Author SHA1 Message Date
Thomas Harte
3c59042388 Fixes initial state for 1kHz. 2021-06-28 21:08:41 -04:00
Thomas Harte
919e211bc4 Reduces number of interrupt-related sequence points. 2021-06-28 19:30:12 -04:00
Thomas Harte
daa0737ce4 Ensure addresses tick upwards even during sync/burst; correct 2/4/8bpp character sizing. 2021-06-28 19:00:51 -04:00
Thomas Harte
36805cb120 Correct tone channel interrupts, remove dead warning. 2021-06-27 23:21:00 -04:00
Thomas Harte
7de69e9874 Makes an attempt to round out the timed interrupts. 2021-06-27 23:09:11 -04:00
Thomas Harte
b93575bbcc Spots that b0 and b2 of 0xb4 are 'dividers', not enables. 2021-06-27 22:33:20 -04:00
Thomas Harte
116e0f0105 Interupts 1kHz and 50Hz interrupts, while edging towards tone generator interrupts. 2021-06-27 22:08:38 -04:00
Thomas Harte
e4a650aaff Implements the 1Hz interrupt. 2021-06-27 21:47:21 -04:00
Thomas Harte
b5312b9ba0 get_interrupt_line can be const. 2021-06-27 21:37:11 -04:00
Thomas Harte
6afee7bb9b Captures appropriate fields. 
No action yet.
 2021-06-27 21:36:55 -04:00
Thomas Harte
2f53b105bb The Enterprise is now an Activity::Source; also sketches out the owner of Dave's timed interrupt logic. 2021-06-27 21:02:04 -04:00
Thomas Harte
be19fa9dde This mapping needs to know where it will occur. 2021-06-27 17:30:09 -04:00
Thomas Harte
81e9ba5608 This is correct from the Enterprise's side of things, I think. 
I just need to complete the missing part of JustInTimeActor. After I do some empirical testing of this.
 2021-06-27 17:24:21 -04:00
Thomas Harte
f2d7b9f6a9 Apply a crop, allow time until Z80 slot to be a future-based query. 2021-06-27 17:13:07 -04:00
Thomas Harte
1ea034310a Edge up very close to video waits. 
I just need to implement back conversions that include marginal phase over in the JustInTimeActor.
 2021-06-27 16:28:01 -04:00
Thomas Harte
895d98e266 Implements out-of-video-area pauses. 2021-06-27 16:11:22 -04:00
Thomas Harte
903e343895 Attempts to complete Dave's audio duties. 2021-06-27 14:06:49 -04:00
Thomas Harte
f8b7c59616 Corrects tone frequency. 2021-06-26 23:51:43 -04:00
Thomas Harte
fcd267a3f9 Starts implementing noise. 2021-06-26 23:48:53 -04:00
Thomas Harte
f8bb66d2a0 Attempts an essentially-complete implementation of tone channels. 2021-06-26 23:39:59 -04:00
Thomas Harte
f2336d2efc I think reloads occur after overflow, not before. 2021-06-26 23:16:00 -04:00
Thomas Harte
c2d093fa3c Respect user volume input. 
Basic tones are now present. Neato!
 2021-06-24 22:27:02 -04:00
Thomas Harte
1a97cc8a91 Start making some effort towards audio generation. 2021-06-24 22:21:01 -04:00
Thomas Harte
c34a548fa0 Ensure character pixel reads can't go out of bounds. 2021-06-24 22:19:50 -04:00
Thomas Harte
520c3c9218 Corrects colour deserialisation. 
Long story short: the documentation I'm reading inexplicably lists the bits in reverse order. Luckily, a lot of the other documentation doesn't.
 2021-06-24 20:59:04 -04:00
Thomas Harte
9230cf1726 Corrects bug when left_ or right_margin_ = 0. 2021-06-24 20:28:50 -04:00
Thomas Harte
6e616972a5 Better binds margin tests to window movements; simplifies line parameter addressing. 2021-06-24 18:55:15 -04:00
Thomas Harte
f98888824d Switches to an overt active/inactive state machine. 2021-06-24 18:34:21 -04:00
Thomas Harte
6c8b23e708 Alters 4bpp mapping; adds character mode 4bpp and 8bpp. 2021-06-23 19:35:47 -04:00
Thomas Harte
2c2bb3765f Withdraws the EPDOS option. 
At least for now; it's something to worry about later.
 2021-06-23 19:32:34 -04:00
Thomas Harte
0d165740ea Honours memory size request. 2021-06-22 21:48:55 -04:00
Thomas Harte
8319aca351 Correct syntax errors. 2021-06-22 20:50:03 -04:00
Thomas Harte
a66734883a Starts sketching out Dave. 2021-06-22 19:33:41 -04:00
Thomas Harte
e062780968 Extends back to 128kb and stops halting on unrecognised ports. 2021-06-22 06:15:42 -04:00
Thomas Harte
3acd0be1f7 Copy and paste 2bpp character support. 2021-06-21 23:27:13 -04:00
Thomas Harte
c1678d7be7 Corrects exposition and transmission of drive selection. 
What a klutz I've been.
 2021-06-21 22:56:25 -04:00
Thomas Harte
117f9a9794 Adds notes on intended meaning of status register. 2021-06-21 07:31:58 -04:00
Thomas Harte
b49cc407c6 Adds some guesses as to the EXDos expansion. 
... with plenty left to do.
 2021-06-20 22:30:27 -04:00
Thomas Harte
954386f1cc Creates a shell for the disk-drive add-on card. 2021-06-20 20:50:23 -04:00
Thomas Harte
d7ff6bd04d Adds necessary declarations to install a DOS ROM. 2021-06-20 20:30:54 -04:00
Thomas Harte
6025516f9f Ensure addresses increment even when there's no target for pixels. 2021-06-20 14:31:02 -04:00
Thomas Harte
d8b9cdf7a2 Correct multiplier. 2021-06-20 14:25:37 -04:00
Thomas Harte
09dbff39f2 Also map keypad to F keys. 
This is a pragmatic and arguably Apple-centric decision. But also it's fairly arbitrary, as the Enterprise doesn't have a number pad.
 2021-06-20 14:25:28 -04:00
Thomas Harte
2fe15a6168 Switch to idealised Nick clock rate. 2021-06-20 14:21:56 -04:00
Thomas Harte
07dc26f8fa Adds TODO to resolve screen jumping. 2021-06-19 23:41:29 -04:00
Thomas Harte
0e1e8c7faa Attempts to support the panoply of EXOS and BASIC versions. 2021-06-19 22:59:09 -04:00
Thomas Harte
23e26e0333 Attempts to complete handling of VRES. 2021-06-19 22:00:19 -04:00
Thomas Harte
fadb04f3f3 Attempts to implement LSBALT and MSBALT. 2021-06-19 21:57:26 -04:00
Thomas Harte
4968ccf46d Corrects attributed mode. 2021-06-19 13:08:14 -04:00
Thomas Harte
1dcac304d3 Implements the ALTIND bits and attempts ATTR mode. 2021-06-19 13:04:18 -04:00
Thomas Harte
1651efe4fc Ensures all keys are initially unpressed. 2021-06-19 13:03:31 -04:00
Thomas Harte
8f24aed43e Slightly reduces logging. 2021-06-18 23:17:44 -04:00
Thomas Harte
a381374e31 Drops back down to 64kb. 2021-06-18 23:14:44 -04:00
Thomas Harte
9411c37d23 Fleshes out the keyboard map. 2021-06-18 23:14:35 -04:00
Thomas Harte
6af6f21868 Attempts to implement interrupt latches and clears. 2021-06-18 22:59:41 -04:00
Thomas Harte
9a0022cfcb Removes temporary work. 2021-06-18 18:44:07 -04:00
Thomas Harte
fbf1adef05 Introduces unit test and thereby seemingly fixes get_next_sequence_point. 
There's still improper output in the actual machine though, so maybe something else is afoot?
 2021-06-18 17:44:17 -04:00
Thomas Harte
311ddfb05a Add note to self for tomorrow. 2021-06-17 22:34:52 -04:00
Thomas Harte
2fd8a8aa66 Begins addition of interrupt feedback from Nick. 
Also fixes clock rate. Though clearly get_next_sequence_point isn't quite right yet.
 2021-06-17 22:30:24 -04:00
Thomas Harte
0c3e9dca28 Adds some basic keyboard inputs. 
I think the next thing required is interrupts though.
 2021-06-17 20:47:56 -04:00
Thomas Harte
c331d15429 Makes space to allow for 64kb EXOS ROMs. 
I think some of the later ROMs have a more thorough memory test, which might provide better detail on whatever's going on here.
 2021-06-16 22:25:00 -04:00
Thomas Harte
4414e96710 Adds enough text mode for now. 
Discovered: a memory fault is being reported at startup.
 2021-06-16 21:42:20 -04:00
Thomas Harte
7161783a4f Adds lpixel output. 2021-06-16 21:16:26 -04:00
Thomas Harte
cbac48da86 Attempts full run at pixel mode. 2021-06-16 20:43:22 -04:00
Thomas Harte
d9142d5427 Adjusts declared scale, accurately to communicate pixel clock. 2021-06-15 22:39:44 -04:00
Thomas Harte
e5e988b28f Adds an incorrect assumed-pixel-mode serialiser. 
This actually shows something a bit like the Enterprise boot logo.
 2021-06-15 22:31:50 -04:00
Thomas Harte
e94e051c87 Adds an allocator for pixels. 2021-06-15 22:03:41 -04:00
Thomas Harte
5fc91effb5 Corrects top border. 2021-06-15 21:48:11 -04:00
Thomas Harte
6c9dacbe89 Stabilises display, albeit that top border mode now appears to be off. 2021-06-15 21:31:07 -04:00
Thomas Harte
6a7eb832cc Introduces almost-stable block-level frame generation. 2021-06-15 20:55:58 -04:00
Thomas Harte
60cf8486bb Makes a genuine attempt at real line counting. 
No output yet though.
 2021-06-15 18:57:14 -04:00
Thomas Harte
90b8163d54 Add exposition. 2021-06-15 17:44:39 -04:00
Thomas Harte
a1e4389f63 Give Nick some RAM to inspect and just enough sense to know when it should reload its line parameter table. 2021-06-15 17:43:13 -04:00
Thomas Harte
440b11708b Adds an unused CRT. 2021-06-14 23:11:48 -04:00
Thomas Harte
f90dce5c54 Take a guess at Nick timing. 2021-06-14 22:56:26 -04:00
Thomas Harte
606c7709cf Shims in enough to get the Z80 to run perpetually. 
Notably I don't actually currently know how the interrupt registers work, but getting some sort of display running might be the first order of business.
 2021-06-14 22:28:31 -04:00
Thomas Harte
1d1e6d1820 Adds a shell of a Nick. 2021-06-14 22:19:25 -04:00
Thomas Harte
3eb4dd74a2 Exposes memory control. 
Machine now runs as far as trying to interact with Nick.
 2021-06-14 21:45:12 -04:00
Thomas Harte
853914480c Revised guess; there's a jump to C02E almost immediately. 2021-06-14 21:40:19 -04:00
Thomas Harte
2a2ac1227b Makes first attempt at giving the Z80 something to do. 2021-06-14 21:29:56 -04:00
Thomas Harte
196c4dcdd9 Adds an appropriate ROM request. 2021-06-14 21:17:09 -04:00
Thomas Harte
c5a86f0ef7 Add Enterprise parts of the static analyser. 2021-06-14 21:11:06 -04:00
Thomas Harte
5f7b3ae313 Adds bare minimum to get a non-functional machine. 2021-06-14 21:02:40 -04:00
Thomas Harte
61c127ed2e Adds Enterprise as a File -> New... machine. 
And, similarly, exposes it for the route used by SDL.
 2021-06-14 20:55:39 -04:00