126 Commits

Author	SHA1	Message	Date
Thomas Harte	a5efa7543a	Added vertical sync, switching fully to the normal NTSC colour space.	2016-06-12 17:57:52 -04:00
Thomas Harte	4c2b964cd4	Added NTSC-VIC's switching of phase every field.	2016-06-12 17:45:25 -04:00
Thomas Harte	6b5a322918	Fixed all colours, plus special case no-chroma for black and white.	2016-06-12 17:41:52 -04:00
Thomas Harte	580c8bdcbd	Ported rest.	2016-06-12 17:29:44 -04:00
Thomas Harte	1a2b18f93b	Steps towards CPU mapping; diagnostic.	2016-06-12 17:27:57 -04:00
Thomas Harte	8abf395202	Experimented with table-based GLSL lookups, and a sine curve. Now _exceedingly_ slow, but colours are correct if I pretend I'm in the YUV colour space.	2016-06-12 14:57:24 -04:00
Thomas Harte	2992183aae	Switched to a lookup table for phase, temporarily in YUV colour space, probably. Working on it.	2016-06-12 14:39:17 -04:00
Thomas Harte	ed76e36b18	Made basic attempt at 16-line character mode.	2016-06-12 11:23:57 -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