43 Commits

Author	SHA1	Message	Date
Thomas Harte	cc9d23f23b	Inverted meaning of register_masks, as it's a bit weird that the mask is inverted immediately upon usage. It's a left-over from thinking the unused bits should be 1s; unit tests reveal they should be 0s. Comment updated appropriately.	2017-08-16 09:29:48 -04:00
Thomas Harte	1a831bcf9b	Quick fix: supply the port being written to correctly.	2017-08-16 09:15:57 -04:00
Thomas Harte	82367a2246	Added documentation.	2017-08-16 09:14:56 -04:00
Thomas Harte	3947347d88	Introduces active input handling for the AY and uses it in the CPC to give proper, active keyboard input, rather than push-on-select, which was only ever a temporary hack. Also maps a few more keys for the Amstrad.	2017-08-15 22:47:17 -04:00
Thomas Harte	e3d1f4fe1e	Subjectively, this might be more correct. It definitely prevents intermediate frequencies. More research required.	2017-08-08 17:58:35 -04:00
Thomas Harte	41a30c147d	Adjusted: invalid register selection simply deselects all registers.	2017-08-07 19:51:36 -04:00
Thomas Harte	7fbb455836	Per the CPC test I'm checking, 0s should be returned for non-retained bits, not 1s.	2017-08-07 19:07:12 -04:00
Thomas Harte	745afd217f	The port input/output flags are now honoured; reading a port that is set as an output returns the current output value.	2017-08-07 19:01:18 -04:00
Thomas Harte	3ca9c38777	Attempted to move to more accurate bus reading — if control lines are set then all subsequent data inputs should act according to the current control lines; changes to port input should be reflected live upon readings, etc.	2017-08-02 19:45:58 -04:00
Thomas Harte	0267bc237f	Added the ability to set a port input, and relaxed bus state testing. I think my on-demand bus reactions here are inappropriate, so more work to do here probably.	2017-08-01 18:04:51 -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	2d4e202be3	Completed dangling comment.	2017-08-01 17:01:36 -04:00
Thomas Harte	aaa60dab12	Fixed signedness of index.	2017-07-21 21:21:01 -04:00
Thomas Harte	e01f3f06c8	Completed curly bracket movement.	2017-03-26 14:34:47 -04:00
Thomas Harte	ced644b103	It seems likely that an AY divides its clock by 8, not 16. I had conflated wave frequency and counter clock.	2017-01-11 22:03:01 -05:00
Thomas Harte	36bc558798	Converted all 'Components' to postfix underscores.	2016-12-03 10:51:09 -05:00
Thomas Harte	7eeaac23e7	Reversed myself. I once again do not think the clock is divided by 256 for envelopes.	2016-11-11 20:31:48 -05:00
Thomas Harte	77987bf31e	Decided to go with divide by 256 for the envelope counter after all.	2016-11-09 21:51:56 -05:00
Thomas Harte	77ce200fbb	Simplified/corrected AY tone/noise mixer logic, and made a new guess at the effect of reading registers that are smaller than 8 bits.	2016-11-09 21:21:17 -05:00
Thomas Harte	21604376e6	Reintroduced clocking of the AY and boxed in the range of the master divider a little further.	2016-10-30 22:51:08 -04:00
Thomas Harte	fd823dc222	Settled on terminology.	2016-10-23 20:42:49 -04:00
Thomas Harte	b12f2f2796	Switched to more straightforward version of two-step loop, dealing with my mistaken dealing of when _master_divider&15 == 0 upon entry without adding an extra sanity check. Am also temporarily on non-modulo logic for tone generation, for a profiling test.	2016-10-23 20:32:48 -04:00
Thomas Harte	583db88299	Added a dispatch queue-powered Apple implementation of the async task queue, removed any mention of skip_samples in the AY since it isn't implemented.	2016-10-22 21:58:45 -04:00
Thomas Harte	33e628a096	Made an attempt to eliminate what amounts to manual division.	2016-10-21 22:16:44 -04:00
Thomas Harte	46a3c0922f	Slightly simplified code, fixed divider.	2016-10-21 22:12:44 -04:00
Thomas Harte	d7c0c49715	Might as well be consistent with divider loads.	2016-10-21 20:07:14 -04:00
Thomas Harte	782ef960e1	Sought both to [start to] optimise the AY and correct divider reloads. It turns out that conditionals aren't that troubling. But I can probably eliminate the counters.	2016-10-21 20:05:38 -04:00
Thomas Harte	cd59eb5f43	Implemented non-linear volume.	2016-10-19 23:07:51 -04:00
Thomas Harte	b59da7d4bc	Added some documentation.	2016-10-19 22:47:44 -04:00
Thomas Harte	08275c6241	Fixed mixer IO bit usage.	2016-10-19 22:22:15 -04:00
Thomas Harte	59162228ef	Reduced mask for clarity.	2016-10-19 22:14:05 -04:00
Thomas Harte	319d7c2b12	Fixed premature wrapping of the envelope, played about with whether that should be subject to a predivision by 256. It feels unlikely?	2016-10-19 22:12:51 -04:00
Thomas Harte	6073906c39	Commented and fixed mistake that would equate any noise divider > 32768 with 0.	2016-10-19 21:51:35 -04:00
Thomas Harte	101f168ea4	Made an attempt to tidy up.	2016-10-19 21:43:18 -04:00
Thomas Harte	ada37abe23	Made an attempt to implement noise and envelopes. Not quite right yet.	2016-10-19 21:13:22 -04:00
Thomas Harte	bd6e6674a0	Fixed signed shift assumption and noise-related register test.	2016-10-18 22:20:12 -04:00
Thomas Harte	9669a5ec9b	Switched to a more authentic interfacing to the AY.	2016-10-18 19:32:15 -04:00
Thomas Harte	43612e1ca2	Made an attempt to eliminate conditionals (running before I can walk?) and started edging towards an envelope generator.	2016-10-17 08:03:38 -04:00
Thomas Harte	9730e8247f	Ensured propagation of synchronise messages, added enough to do plain tone. Probably. So: noise and envelopes missing. And it's all far too quiet.	2016-10-15 21:04:21 -04:00
Thomas Harte	51bdac27ae	Made some AY advances; it's now being polled for samples and collecting more information on what it needs to output.	2016-10-15 17:45:39 -04:00
Thomas Harte	288d10c253	Got some keyboard reaction.	2016-10-14 21:44:15 -04:00
Thomas Harte	138eabcff4	Continued in my effort to wire up a keyboard. Will need further to continue.	2016-10-14 21:35:15 -04:00
Thomas Harte	d8e4c488c2	Started iterating towards having an AY and a fully-working keyboard.	2016-10-14 21:18:03 -04:00