46 Commits

Author	SHA1	Message	Date
Thomas Harte	d9097facf1	Found documentation that makes more sense, and in practice seems to be more correct: the test after vertical sync is for greater than 32, not less. Also I decided to chance my arm on counter reset also resetting interrupt request. The raster effects of Ghouls 'n' Ghosts is now pretty much correct but one line off. I think probably either something is off in my wait-two logic on the post-vsync timer event, or possibly the vsync bit exposed via the PPI doesn't mean exactly what I think it means.	2017-08-04 08:56:09 -04:00
Thomas Harte	b927500487	Clarified code a little, but this is mostly fiddling in the margins.	2017-08-03 22:00:30 -04:00
Thomas Harte	e71eabedf9	Fixed timer clearing tet.	2017-08-03 21:30:04 -04:00
Thomas Harte	33ed27c3ad	Minor tidiness: included missing headers, and spaced out the ROM type and key lists for readability.	2017-08-03 12:45:42 -04:00
Thomas Harte	575b1dba75	Formally declared the ZX80/81 and Amstrad CPC as keyboard machines in their public interface. Which means not having to repeat the meaning of set_key_state and clear_all_keys. So: a minor DRY improvement.	2017-08-03 12:38:22 -04:00
Thomas Harte	42e70ef993	Adjusted slightly as per Z80 change, and to pull everything internally declared into the Amstrad CPC namespace.	2017-08-02 22:11:03 -04:00
Thomas Harte	d3bf8fa53b	Upped the documentation.	2017-08-02 20:37:26 -04:00
Thomas Harte	f5e2dd410e	Constrained output to the centre 90%.	2017-08-02 19:55:44 -04:00
Thomas Harte	e50adf1cc8	Were my TZX support up to it, this would likely be sufficient for tape emulation.	2017-08-02 13:50:14 -04:00
Thomas Harte	dcab10f53e	Ensured the AY's async queue doesn't just fill and fill.	2017-08-02 07:38:35 -04:00
Thomas Harte	f602f9b6ec	Adds an attempt to clock the AY.	2017-08-02 07:21:33 -04:00
Thomas Harte	4d5d5041df	Attempted to ensure a clean startup.	2017-08-01 22:18:42 -04:00
Thomas Harte	587eb3a67c	Factored interrupt counting out of the CRTCBusHandler.	2017-08-01 22:15:39 -04:00
Thomas Harte	8d39a20088	Added proper output of mode 3, were anything ever to try to use it.	2017-08-01 21:51:41 -04:00
Thomas Harte	4b6370eb86	Realised my colour error: mapping the ROM numbers as though they were the hardware numbers. Having fixed that, spotted that I was deserialising R and B the wrong way around and dividing by too much. Colours now appear to be correct.	2017-08-01 21:47:52 -04:00
Thomas Harte	c6e340a8a2	Wired up the vsync signal. Pen 15 no longer flashes like crazy. Still can't figure out why the palette is so askew; was looking for perhaps some sort of detection of a green screen rather than a colour one, but there's no obvious input for that.	2017-08-01 21:21:59 -04:00
Thomas Harte	31c7153301	Corrected bit to colour mapping for modes 0 and 1. The total palette is still way off but there's consistency between modes now.	2017-08-01 20:52:42 -04:00
Thomas Harte	7e04d00cc1	Fixed key values, causing the new set of keys to work, decreased quantity of output and ensured that pixels appear in modes 0 and 2.	2017-08-01 20:39:10 -04:00
Thomas Harte	eca9586a0f	Fixed: input value is no longer overwritten by 0xff. The '0' key now works.	2017-08-01 20:19:02 -04:00
Thomas Harte	2e4577f741	Made a game attempt at implementing a (sticky) keyboard. No effect yet.	2017-08-01 17:52:05 -04:00
Thomas Harte	f5b278d683	Added enough stuff to put the emulated Amstrad CPC in a state of knowing whether its '0' key is pressed.	2017-08-01 17:31:56 -04:00
Thomas Harte	e6854ff8db	Corrected typo: the input to an AY is BDIR, not BCDIR.	2017-08-01 17:06:57 -04:00
Thomas Harte	3b292273c7	Fixed: BC2 is always implicitly set. The machine is now periodically checking the AY's register 14 (i.e. the first input port), so probably there's enough here now to implement keyboard input.	2017-08-01 17:05:11 -04:00
Thomas Harte	cb732e5d5f	Made an attempt to wire in an [unclocked] AY, in an endeavour to get to keyboard reading.	2017-08-01 17:01:58 -04:00
Thomas Harte	08ad35efd9	It's barely an implementation of the 8255, but ensured that data is bounced into the PortHandler, conveniently assuming the interaction mode used by the CPC.	2017-08-01 16:34:13 -04:00
Thomas Harte	58b98267fc	Formally transferred ownership of PIO accesses to an incoming template, and decided to start being explicit about how to specify the interfaces and provide fallbacks for optional behaviour for the new, clean generation of interfaces. A full-project sweep will inevitably occur but I'll try to tie off this branch first.	2017-08-01 16:15:19 -04:00
Thomas Harte	a27946102a	Took a shot at the interrupt counter. Attempts at keyboard reading now recur so it'll probably do for now. I think that next puts me into the realm of needing to implement the 8255.	2017-08-01 15:49:16 -04:00
Thomas Harte	6ac7132799	Had a quick go at properly outputting Mode 1, adding wiring to communicate palette and mode changes to the CRTC bus handler. Colours are off but it's sufficient for now.	2017-08-01 15:16:13 -04:00
Thomas Harte	ca42abab70	Doubled up to ensure that every byte that should be inspected is represented. This makes it clearer that I'm on the right road. A garbled version of 'Amstrad 64k Microcomputer' can be discerned, in a weird grayscale and with the right-hand column missing and skewed output as a result.	2017-08-01 07:56:44 -04:00
Thomas Harte	933d69a256	Fixed slightly: the CPC wiki has a typo. It's 12 and 13 that move up to 14 and 15.	2017-08-01 07:51:13 -04:00
Thomas Harte	10a5581aea	Made first attempt at offering some sort of pictographic of actual RAM contents.	2017-08-01 07:34:12 -04:00
Thomas Harte	3ae699964f	Ensured an actual pixel stream is supplied for pixel regions. Though it's just a long stream of white pixels for now. So visual output is unchanged.	2017-08-01 07:24:29 -04:00
Thomas Harte	42dd27c9b1	Shunted method bodies inline, given that there's no need for a declaration/definition distinction.	2017-07-31 22:39:25 -04:00
Thomas Harte	3df13cddd4	As per my keenness for cleanliness improvements corresponding to my ever-increasing C++ ability: turned the Amstrad into something that a factory produces, allowing me completely to hide a bunch of implementation details.	2017-07-31 22:32:04 -04:00
Thomas Harte	c2253c1e0f	Fixed multiplier: the dot clock I've used to instantiate the CRT is the pixel clock, not the character clock.	2017-07-31 22:17:46 -04:00
Thomas Harte	f742fd5d4a	Made basic attempt to get something on screen: white where the display is enabled, black for the border.	2017-07-31 22:13:20 -04:00
Thomas Harte	69b99fe127	Transferred ownership of the CRT to the CRTC bus handler, to give it easy access.	2017-07-31 22:04:52 -04:00
Thomas Harte	e28829bd1b	Corrected CRTC timing, gave it someone to talk to and a means with which to talk.	2017-07-31 20:14:46 -04:00
Thomas Harte	68ceeab610	Created a 6845 class and started pushing data at it and clocking it. It doesn't currently have the concept of a bus but will do, hence the in-header implementation.	2017-07-31 19:56:59 -04:00
Thomas Harte	68dca9d047	Made a first attempt at ROM paging, with pretty much the same scheme that'll be needed for 128kb support.	2017-07-31 19:37:28 -04:00
Thomas Harte	d88ca151f4	Added a first attempt at output port decoding. Just logging for now.	2017-07-31 19:25:10 -04:00
Thomas Harte	3c90218c3d	With a very basic stab at something a bit like the memory map (sans paging), execution begins.	2017-07-31 19:15:43 -04:00
Thomas Harte	afd409c883	Ensured that ROM images are loaded and passed to the Amstrad CPC.	2017-07-31 18:44:49 -04:00
Thomas Harte	9c04d851e4	Added the basics necessary to get the CPU ticking over, at a nominal 4Mhz but with the wait states that I currently believe to be accurate.	2017-07-31 07:29:50 -04:00
Thomas Harte	1d6fe11906	Added an instance of Outputs::CRT::CRT. So progress is now: select CDT, up comes a blank window.	2017-07-31 07:16:51 -04:00
Thomas Harte	c0f1313830	Performed sufficient wiring to get to the point where attempting to load a CDT creates an instance of the Amstrad CPC and then fails only because the thing vends a nullptr CRT.	2017-07-30 22:05:29 -04:00