123 Commits

Author	SHA1	Message	Date
Thomas Harte	a4c011e3c0	Flip meaning of INT1 input read.	2021-07-09 22:39:51 -04:00
Thomas Harte	6225abd751	Adds 6MHz Enterprise option.	2021-07-07 20:57:04 -04:00
Thomas Harte	0e49258546	Remove caveman debugging.	2021-07-06 23:15:53 -04:00
Thomas Harte	264b8dfb28	Dave: apply ring modulation even in sync mode.	2021-07-06 23:11:30 -04:00
Thomas Harte	5167d256cc	Remove detritus.	2021-07-06 22:43:17 -04:00
Thomas Harte	16bd826491	Reduce nesting.	2021-07-06 22:32:59 -04:00
Thomas Harte	55af8fa5d9	Avoid erroneous Nick delays.	2021-07-06 22:28:44 -04:00
Thomas Harte	1ec8ff20af	Ensure data bus is 0xff during interrupts.	2021-07-06 21:58:17 -04:00
Thomas Harte	7a673a2448	Avoid confusing temporary storage.	2021-07-06 20:23:09 -04:00
Thomas Harte	33e2a4b21c	Minor cleanups.	2021-07-06 20:20:13 -04:00
Thomas Harte	3e6b804896	Switches to linked 1/50/1000 Hz timers, and per-interrupt state toggling.	2021-07-06 20:12:44 -04:00
Thomas Harte	c20e8f4062	Honours 8/12Mhz selection in non-video delays.	2021-07-03 23:05:09 -04:00
Thomas Harte	4add48cffb	Obey Dave's 8/12MHz programmable divider.	2021-07-03 22:43:20 -04:00
Thomas Harte	43ceca8711	Use type alias.	2021-07-03 19:10:39 -04:00
Thomas Harte	3ef28a4f03	Remove unused instance variable.	2021-07-03 19:10:29 -04:00
Thomas Harte	5715c9183f	The target is now definitely used.	2021-07-03 15:20:37 -04:00
Thomas Harte	196651d9aa	Consolidates TODO.	2021-07-03 13:08:53 -04:00
Thomas Harte	6b46212a4e	Deal with dangling TODO.	2021-07-03 13:07:41 -04:00
Thomas Harte	2a6fff2008	Takes a stab at what might happen if you read from Nick.	2021-07-03 13:06:07 -04:00
Thomas Harte	c5944efe50	Adds various method definitions.	2021-07-03 12:56:56 -04:00
Thomas Harte	f384370b18	Switch what's left of Enterprise logging to actual LOGs.	2021-07-03 12:50:46 -04:00
Thomas Harte	278671cdb9	Correct Nick interrupt prediction.	2021-07-03 00:05:13 -04:00
Thomas Harte	964d2d4fa4	Be consistent in expression of logic.	2021-07-03 00:00:00 -04:00
Thomas Harte	283092cfbc	With a unit test in aid, corrects some lingering TimedInterruptSource issues.	2021-07-02 23:41:19 -04:00
Thomas Harte	614953a222	Allows the low-pass filter to react to high-pass effects.	2021-07-02 22:36:35 -04:00
Thomas Harte	4fffb3cf19	Allow that final Z80 cycle to start anywhere in the first three of Nick's window of six.	2021-07-02 22:29:35 -04:00
Thomas Harte	7826a26c7b	Adds Enterprise composite video option. ... While enabling more pixels on the left for RGB mode.	2021-07-02 21:42:09 -04:00
Thomas Harte	763b9ba0ec	Ensure the splash screen is skipped for self-booting disks.	2021-07-02 21:11:54 -04:00
Thomas Harte	742d44a532	Switch to an activity-based typing trigger; add a target loading command.	2021-07-01 22:53:23 -04:00
Thomas Harte	52b96db2b9	Correct syntax, mapping and inter-key timing.	2021-07-01 21:18:15 -04:00
Thomas Harte	0b9de78c38	Add typer support for the Enterprise.	2021-07-01 21:05:03 -04:00
Thomas Harte	3d8fc9952d	Remove dead TODO, correct for overflow position.	2021-06-29 15:44:02 -04:00
Thomas Harte	8ce8fbd977	Provide correct input when one of the tone generators is the interrupt source.	2021-06-29 15:41:08 -04:00
Thomas Harte	7f08218b28	The Nick interrupt input also seems to be a live poll, not a retrieval of the mask. ... This corrects the two pieces of software I knew not to be working.	2021-06-28 22:10:11 -04:00
Thomas Harte	2c139ad931	Adds some notes to self. ... I think I'm starting to find enough information to handle tapes.	2021-06-28 22:03:06 -04:00
Thomas Harte	1119779c8b	Ensure EXDOS card is completely disabled if no FDC is present.	2021-06-28 21:47:53 -04:00
Thomas Harte	5351ac560f	Ensure the motor goes off for unselected drives.	2021-06-28 21:40:12 -04:00
Thomas Harte	49f0ab0f15	Add note to self. ... Although I still think there may be some issue lurking.	2021-06-28 21:31:55 -04:00
Thomas Harte	a5c57e777e	VRES appears to work negatively in attribute mode too.	2021-06-28 21:24:13 -04:00
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