24 Commits

Author	SHA1	Message	Date
Thomas Harte	d1731b1d26	Hacked my 6522 to work. Mistake is in not returning output as input when appropriate — i.e. that I'm ignoring data direction. Also fixed K and L keys.	2016-06-11 13:06:01 -04:00
Thomas Harte	7a241b5ef5	Added just enough hopefully to allow implementation of the keyboard-input VIA.	2016-06-11 11:34:39 -04:00
Thomas Harte	de84758862	This is how flags writes are supposed to work, it seems.	2016-06-11 07:58:32 -04:00
Thomas Harte	1054793fd7	Fixed interrupt enable register. This makes a lot more sense!	2016-06-11 07:57:04 -04:00
Thomas Harte	82a3c4964b	Decided to keep the internal copy of the interrupt enable the other way around. Reduced delegate noise.	2016-06-11 07:49:07 -04:00
Thomas Harte	a71259dec3	Gave the 6522 a full and grouped register set.	2016-06-11 07:12:55 -04:00
Thomas Harte	1ed04fae1e	Resolved 6560 addressing.	2016-06-10 18:12:21 -04:00
Thomas Harte	f3b1d7de82	... and that's a flashing cursor. Keyboard input next!	2016-06-09 22:37:59 -04:00
Thomas Harte	30b7db3979	Attempted a square wave, made the Vic itself responsible for address manipulation re:the 6560.	2016-06-09 22:05:17 -04:00
Thomas Harte	e99055bedb	Attempted switching back to a square wave for the composite video and otherwise implementing what's necessary to get to that flashing cursor — the 6560 returns its scan line and the timing bits of the 6522 are appearing.	2016-06-08 22:15:24 -04:00
Thomas Harte	581eace478	Increased logging slightly, ensured all of colour RAM can be read, slightly improved the 2600 pixel decoder.	2016-06-07 22:01:14 -04:00
Thomas Harte	26ab96868a	Decided to turn the 6522 into a template, since it's a per-cycle thing with variable behaviour. Added appropriate memory map callouts to hit the two in the Vic. Though they don't yet do anything.	2016-06-07 19:15:18 -04:00
Thomas Harte	6522530e1c	Actually, I'm dithering over whether the 6522 should be an ordinary class or a curiously-recurring template. But it'll need a file, definitely.	2016-06-06 21:56:02 -04:00
Thomas Harte	ca23e2e10a	This now proceeds to an ostensibly working basic prompt. Colours are wrong, 6560 is probably very wrong, 6522 is still absent. Hence no cursor.	2016-06-06 20:33:06 -04:00
Thomas Harte	c7c55528e2	Realised that registers appear also to be readable.	2016-06-06 20:29:39 -04:00
Thomas Harte	e8cb674073	Made some attempt at colours, at least.	2016-06-06 20:18:24 -04:00
Thomas Harte	89c87c3e81	Some major hackiness gives the first line of expected text repeating endlessly (as the end of columns is never reached, as that's back to thinking it's 0x7f); I also don't yet know which actor is supposed to do the '+0x8000' (which probably shouldn't be that but might be a pin on the 6560 indicating what sort of value is being fetched, that effects chip select for the various bits of memory?)	2016-06-06 07:47:30 -04:00
Thomas Harte	64539a2b24	Advanced to having some characters displayed, even though they're obviously very much incorrect and the display is still rolling.	2016-06-06 07:35:35 -04:00
Thomas Harte	79e05a2413	Without yet figuring out what vertical sync is meant to do, moved just about far enough forwards to see _something_ that hopefully I can soon discern characters within.	2016-06-05 18:02:49 -04:00
Thomas Harte	444d3b69b6	Made some elementary attempt to hit something like the correct states within the VIC.	2016-06-05 17:06:10 -04:00
Thomas Harte	9e9e50edb1	Added guess on how colour memory and the 12-bit bus possibly works.	2016-06-05 16:28:06 -04:00
Thomas Harte	3be1ce457b	Made some attempt at discerning fields.	2016-06-05 14:05:31 -04:00
Thomas Harte	9566c87532	Added enough to the machine that the 6560 can now produce output if it wishes.	2016-06-05 12:11:12 -04:00
Thomas Harte	f922d38ed2	The Vic now captures the ROMs sent to it and has just enough infrastructure to get to a black screen. Progress!	2016-06-05 10:51:07 -04:00