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
|
9d953421d8
|
After a quick check, added a couple of other _delegate initialisations. I should probably find a way to template this.
|
2017-08-01 07:07:43 -04:00 |
|
Thomas Harte
|
763e3b65d1
|
Ensured a proper initial value for delegate_.
|
2017-07-31 22:46:06 -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 |
|
Thomas Harte
|
4abd62e62b
|
Standardises on const [Half]Cycles as the thing called and returned, rather than const [Half]Cycles & as it's explicitly defined to be only one int in size, so using a reference is overly weighty.
|
2017-07-27 22:05:29 -04:00 |
|
Thomas Harte
|
968d2bb8ba
|
Brought Typer into the new run_for orthodoxy, making it easier to clock consistently regardless of unit. Which necessitated adding a negative operator for WrappedInts.
|
2017-07-27 21:53:45 -04:00 |
|
Thomas Harte
|
9ef232157b
|
Revoked the operator bool() on WrappedInt as providing an indirect means for implicit but incorrect assignment to unwrapped ints. Got explicit about run_for intention and simplified HalfClockReceiver slightly by building a lossy and a flushing conversion to Cycles into HalfCycles. Adapted the all-RAM Z80 properly to return HalfCycles.
|
2017-07-27 21:38:50 -04:00 |
|
Thomas Harte
|
8848ebbd4f
|
Formalised set_interrupt_line's optional parameter as being a count of HalfCycles; corrected PartialMachineCycle.is_wait and effected the proper timing for counter reset on a ZX81.
|
2017-07-27 21:10:14 -04:00 |
|
Thomas Harte
|
8361756dc4
|
Switched definitively to the works-for-now approach of requiring an explicit opt-in where somebody wants to clock a whole-cycle receiver from a half-cycle clock.
|
2017-07-27 07:40:02 -04:00 |
|
Thomas Harte
|
81a3899381
|
Adjusted the Z80 formally to communicate in terms of half cycles rather than whole.
|
2017-07-26 19:42:00 -04:00 |
|
Thomas Harte
|
cda223ffc0
|
Added explicit signedness cast.
|
2017-07-25 22:49:03 -04:00 |
|
Thomas Harte
|
966b5e6372
|
Adapted the Z80's perform_machine_cycle to return Cycles.
|
2017-07-25 22:25:44 -04:00 |
|
Thomas Harte
|
279c369a1f
|
Switched to Cycles as the result from the 6502 perform_bus_operation, helping slightly to clarify what you're intended to return and reducing type jumping within the 6502 implementation.
|
2017-07-25 22:21:09 -04:00 |
|
Thomas Harte
|
d9c6b3bcf7
|
Corrected TIA's WSYNC lookahead to accept Cycles.
|
2017-07-25 22:13:41 -04:00 |
|
Thomas Harte
|
296c7cec05
|
Adopted flush widely.
|
2017-07-25 20:42:51 -04:00 |
|
Thomas Harte
|
75d67ee770
|
Relocated ClockReceiver.hpp as it's a dependency for parts of the static analyser, and therefore needs to be distinct from the actual emulation parts.
|
2017-07-25 20:20:55 -04:00 |
|
Thomas Harte
|
a1e9a54765
|
Eliminated redundant uses of ClockReceiver and sought to ensure that proper run_fors are inherited all the way down.
|
2017-07-25 20:09:13 -04:00 |
|
Thomas Harte
|
8d1dacd951
|
Clean ups along the Electron::Tape line: ensured that the ClockReceiver is opted into only once, and that its run_for propagates all the way along the chain.
|
2017-07-25 20:01:30 -04:00 |
|
Thomas Harte
|
40339a12e1
|
Formalised the use of a cycles count with a divider, bringing a few additional plain-int users into the fold.
|
2017-07-25 07:15:31 -04:00 |
|
Thomas Harte
|
90bf6565d0
|
Reduced int/Cycle conversions in the Electron and on the Atari 2600, where the current framework makes it possible to do so.
|
2017-07-24 22:53:13 -04:00 |
|
Thomas Harte
|
c1527cc9e2
|
Reduced back-and-forth between Cycles and ints within the Oric.
|
2017-07-24 22:46:31 -04:00 |
|
Thomas Harte
|
c77a83d86f
|
The 6560 is now a ClockReceiver. This reduces to zero the number of remaining instances of the text run_for_cycles in this codebase.
|
2017-07-24 22:38:35 -04:00 |
|
Thomas Harte
|
a6e377aa57
|
The Electron's video is now a ClockReceiver.
|
2017-07-24 22:36:42 -04:00 |
|
Thomas Harte
|
9435c1e12a
|
The 1540 is now a ClockReceiver.
|
2017-07-24 22:32:41 -04:00 |
|
Thomas Harte
|
efdac2ce8c
|
The 6522 is now a ClockReceiver.
|
2017-07-24 22:29:09 -04:00 |
|
Thomas Harte
|
2912d7055b
|
The 6532 is now a ClockReceiver.
|
2017-07-24 21:57:24 -04:00 |
|
Thomas Harte
|
55ecb0c022
|
Converted the Microdisc into a ClockReceiver.
|
2017-07-24 21:51:13 -04:00 |
|
Thomas Harte
|
13f7aa4063
|
The TIA is now a ClockReceiver.
|
2017-07-24 21:48:34 -04:00 |
|
Thomas Harte
|
915f587ef1
|
Updated the Electron's tape class to be a ClockReceiver.
|
2017-07-24 21:36:30 -04:00 |
|
Thomas Harte
|
b7f88e8f61
|
Filter is now a ClockReciever, affecting all sound output devices.
|
2017-07-24 21:29:13 -04:00 |
|
Thomas Harte
|
8a2bdb8d22
|
Converted the TimedEventLoop and the things that sit atop it into ClockReceivers.
|
2017-07-24 21:19:05 -04:00 |
|
Thomas Harte
|
b82bef95f3
|
Decided to follow through on Cycles and HalfCycles as complete integer-alikes. Which means giving them the interesting range of operators. Also killed the implicit conversion to int as likely to lead to type confusion.
|
2017-07-24 20:10:05 -04:00 |
|
Thomas Harte
|
ba088e5545
|
Adapted the Z80 into a clock receiver, which also vends Cycles rather than a raw int within its PartialMachineCycle struct. The objective is to update it to vend HalfCycles within its struct, but I think I need to do some work on cycle/half-cycle arithmetic first.
|
2017-07-23 22:15:04 -04:00 |
|
Thomas Harte
|
6369138bd1
|
Converted the Oric's video output into a ClockReceiver.
|
2017-07-22 23:11:30 -04:00 |
|
Thomas Harte
|
c2a7dffa7d
|
Converted the ZX80/81 video component into a ClockReceiver. As it happens, it's most convenient to take the half-cycle bus here.
|
2017-07-22 23:02:28 -04:00 |
|
Thomas Harte
|
2ff157cf7a
|
Switched CRTMachine over to use Cycles as an explicit statement of units, and followed through on the effects of that.
|
2017-07-22 22:17:29 -04:00 |
|
Thomas Harte
|
83628b285b
|
Experimentally turned the 6502 into a clock receiver. No problem encountered.
|
2017-07-22 21:52:21 -04:00 |
|
Thomas Harte
|
1bbb4cb478
|
Increased documentation.
|
2017-07-22 17:39:51 -04:00 |
|
Thomas Harte
|
d46da6ac9d
|
Added documentation.
|
2017-07-22 17:31:12 -04:00 |
|
Thomas Harte
|
dddb30477b
|
Used a different inner-loop variable, for clarity.
|
2017-07-21 21:52:08 -04:00 |
|
Thomas Harte
|
37459a3ebc
|
Fixed parameter shadowing.
|
2017-07-21 21:51:18 -04:00 |
|
Thomas Harte
|
3f609e17b3
|
Factored out the table-lookup approach to being a typer, and adjusted so as definitely to limit myself to positive offset table lookups.
|
2017-07-21 21:18:51 -04:00 |
|
Thomas Harte
|
2471ef805b
|
Fixed signed/unsigned comparison and potential negative table reference.
|
2017-07-21 20:45:49 -04:00 |
|
Thomas Harte
|
a3e0024980
|
Chopped time accumulation out of the default Tape process because it's proving to be sufficiently expensive for a TZX as not to be worthwhile. Introduced a cheaper position capturing/restoring method.
|
2017-07-21 18:55:03 -04:00 |
|
Thomas Harte
|
44e5a03cf2
|
Removed just-don't-power-the-tape approach to pausing and playing, in favour of being fully communicative.
|
2017-07-19 19:21:27 -04:00 |
|
Thomas Harte
|
b3861ff755
|
Reduced copying of Pulses.
|
2017-07-16 19:49:31 -04:00 |
|
Thomas Harte
|
1d3ae31755
|
Abstracted the concept of an Acorn shifter away from being a PLLParser. The Acorn tape parser now skips using that class and uses the shifter. The actual Electron also uses the shifter. So the two are completely aligned. Net result: the Electron should successfully load exactly when static analysis was successful.
|
2017-07-16 19:24:01 -04:00 |
|
Thomas Harte
|
f931cd582d
|
Switched to use of std::vector in those few remaining places where I was still using a unique_ptr to a native type and newing for myself. So, some of my earliest bits of code.
|
2017-07-16 13:54:07 -04:00 |
|
Thomas Harte
|
481487f084
|
Oh yuck, it looks like I've repeated this same test in two different places. Must figure out where to factor it out to. But in the meantime, the emulated Electron has just loaded its first CSW.
|
2017-07-13 22:39:30 -04:00 |
|
Thomas Harte
|
ac59dd8b1d
|
Added enough typing to issue a load command. No thoughts as to running yet though.
|
2017-07-09 22:07:12 -04:00 |
|
Thomas Harte
|
353c854734
|
Removed a TODO that is no longer appropriate.
|
2017-07-09 22:06:50 -04:00 |
|
Thomas Harte
|
3e5c209039
|
Added basic Typer support for the ZX80 and '81.
|
2017-07-09 22:00:34 -04:00 |
|
Thomas Harte
|
ed28260aaf
|
Hardens the ZX80/81 video routines to ensure they never try to push data into the future and don't double-count time when pixels would ostensibly run into sync. You could previously see the CRT being handed negative run lengths if sync interrupted pixels or if a run of more than 320 pixels (my arbitrary buffer size) occurred, with corresponding poor behaviour given my use of unsigned numbers.
|
2017-07-09 19:33:05 -04:00 |
|
Thomas Harte
|
87658e83c1
|
Moved line counter reset logic; I think this is actually correct.
|
2017-07-09 00:05:30 -04:00 |
|
Thomas Harte
|
4509c3ce34
|
By observation, it appears that disabling vsync occurs on any port output whatsoever, as long as NMI isn't blocking it.
|
2017-07-08 21:01:52 -04:00 |
|
Thomas Harte
|
30e93979d2
|
Removed data work if sync is enabled; in that case no data is output.
|
2017-07-08 21:01:07 -04:00 |
|
Thomas Harte
|
d6b87053bf
|
Introduced an explicit record of whether a video byte is latched. It's definitely incorrect to treat the latching of 0 as equivalent to no latching, as the byte that will eventually become video is not strongly implied.
|
2017-07-08 20:40:19 -04:00 |
|
Thomas Harte
|
22389a5d2d
|
Merge branch 'master' into HiRes
|
2017-07-08 20:38:25 -04:00 |
|
Thomas Harte
|
54efcb7e2f
|
Made a game attempt at automatic motor control and ensured setting is initialised correctly from the user defaults.
|
2017-07-08 19:31:20 -04:00 |
|
Thomas Harte
|
e2575d6de4
|
Routed tape motor selections through to the C++ side of the world, and ensured that manual tape playback works properly.
|
2017-07-08 19:21:12 -04:00 |
|
Thomas Harte
|
46fff8e8a2
|
Ensured bit 8 is uniquely from the latched video byte, not an OR of that with the refresh address.
|
2017-07-06 22:48:48 -04:00 |
|
Thomas Harte
|
a3684545b5
|
Added a block on the tape motor for a short period after each time the ROM routine is intercepted for a substituted byte read. To reduce the collision between fast tape and real tape loading.
|
2017-07-06 22:33:54 -04:00 |
|
Thomas Harte
|
b842c5b8bb
|
Merge branch 'master' into ZX81FastLoading
|
2017-07-06 22:03:24 -04:00 |
|
Thomas Harte
|
0c037627fc
|
Typer fixes: the recipient no longer releases the caller, and a duplicate call to strlen and piece of arithmetic is corrected.
|
2017-07-06 21:38:56 -04:00 |
|
Thomas Harte
|
a72a2e0a1a
|
Ensured tape doesn't proceed of its own volition when in fast-loading mode.
|
2017-06-23 20:21:37 -04:00 |
|
Thomas Harte
|
50375fb373
|
Ensured tape position is unaffected if the attempt at loading quickly fails.
|
2017-06-23 20:18:19 -04:00 |
|
Thomas Harte
|
cb105fdeb4
|
Took a first stab at high-res support.
|
2017-06-22 22:48:17 -04:00 |
|
Thomas Harte
|
acfd4dde36
|
Reduced port writes which can adjust programmatic sync, and prevented anything while NMI generation is active. Moved line counter increment from triggered by interrupt acknowledge to triggered by horizontal sync. In both cases, cribbing from my own earlier work. Initial results suggest that sync issues are resolved in third-party software.
|
2017-06-22 22:44:06 -04:00 |
|
Thomas Harte
|
644ef13acd
|
Connected up the fast-tape GUI option for the ZX80 and '81.
|
2017-06-22 20:20:31 -04:00 |
|
Thomas Harte
|
b7c978e078
|
Added getters for most of the input lines, and attempted to round out the ZX81's wait logic.
|
2017-06-22 20:11:19 -04:00 |
|
Thomas Harte
|
52d9ddf9e5
|
Gave the binary tape player a more logical assignment of wave level to output level. Which miraculously appears to have been the issue with the ZX80/81 tape loading — the inconsistency of silences seems to have been the issue.
|
2017-06-21 22:13:24 -04:00 |
|
Thomas Harte
|
a6810fc3ef
|
Removed some minor duplicity and ensured that hsync/NMI ends on the nominated cycle, not one afterwards.
|
2017-06-21 21:44:42 -04:00 |
|
Thomas Harte
|
15f6c51062
|
Added the most trivial implementation of the ZX81 wait line.
|
2017-06-21 21:28:14 -04:00 |
|
Thomas Harte
|
e1355d4b62
|
Restored proper video output.
|
2017-06-21 21:18:09 -04:00 |
|
Thomas Harte
|
4bf13610ce
|
Reinstated interrupts by moving the refresh test back into the refresh cycle.
|
2017-06-21 21:03:39 -04:00 |
|
Thomas Harte
|
0e0ce379b4
|
Renamed MachineCycle to PartialMachineCycle given that it mostly no longer intends to describe an entire machine cycle.
|
2017-06-21 20:38:08 -04:00 |
|
Thomas Harte
|
36e8a11505
|
Sought to simplify the way partial machine cycles are communicated, for ease of machine implementation. Also implemented the wait line.
|
2017-06-21 20:32:08 -04:00 |
|
Thomas Harte
|
e1a2580b2a
|
Renamed BusOperation to MachineCycle::Operation.
|
2017-06-17 21:53:45 -04:00 |
|
Thomas Harte
|
08a542a324
|
Reenabled the fast-loading hack.
|
2017-06-15 18:30:12 -04:00 |
|
Thomas Harte
|
9b3d05e05f
|
Simplified decoding logic.
|
2017-06-14 22:24:44 -04:00 |
|
Thomas Harte
|
d8e3103a2b
|
Fixes: switched ZX80 and ZX81 timing to the correct way around, ensured that my wait takes effect if HALT **isn't** set, and made sure to recover from it.
|
2017-06-13 21:48:17 -04:00 |
|
Thomas Harte
|
76a64d13a0
|
Made a first attempt at ZX81 emulation.
|
2017-06-13 21:25:55 -04:00 |
|
Thomas Harte
|
1e975859c2
|
Started splitting ZX80 and ZX81 paths. Also the '80 fires its horizontal sync a little earlier than the '81, so pulled that back a little.
|
2017-06-13 20:09:09 -04:00 |
|
Thomas Harte
|
4c5261bfa0
|
Made first attempt to use the horizontal counter for something; here for sync timing only, even though I've gone exclusively with '81-style timing for now.
|
2017-06-12 22:28:30 -04:00 |
|
Thomas Harte
|
8b09b4180b
|
This now at least remembers whether it is meant to be a ZX81 and has storage for a horizontal counter.
|
2017-06-12 21:33:16 -04:00 |
|
Thomas Harte
|
b9dbb6bcf8
|
Discovered my timing error: the I/R <-> A loads should take an extra cycle. This means the ZX80 now finally takes the correct 207 cycles per line. Fixed the video output wave to be clocked at the appropriate rate.
|
2017-06-12 18:55:04 -04:00 |
|
Thomas Harte
|
302c2e94de
|
Corrected lingering hard-coded mask. So titles for memory configurations above 1kb now load.
|
2017-06-11 21:27:46 -04:00 |
|
Thomas Harte
|
06fe07932a
|
While tidying up, killed an unused instance variable.
|
2017-06-11 21:21:26 -04:00 |
|
Thomas Harte
|
6913c7a018
|
This also can just use rom_mask_.
|
2017-06-11 19:29:20 -04:00 |
|
Thomas Harte
|
6b602c74b7
|
Made an attempt to support memory maps other than the unexpanded default of 1kb.
|
2017-06-11 19:29:02 -04:00 |
|
Thomas Harte
|
e40d553045
|
Bumped the tape parser up into the machine to ensure a maintained state. Temporarily disabled normally-timed tape playback.
|
2017-06-11 18:31:43 -04:00 |
|
Thomas Harte
|
e5b30cdfbb
|
Attempted to ensure appropriate resumption of processing after quick-reading a tape byte.
|
2017-06-11 17:28:47 -04:00 |
|
Thomas Harte
|
ba5f34f827
|
Narrowed view to the centre 80% of a frame.
|
2017-06-11 17:24:32 -04:00 |
|
Thomas Harte
|
84d2feb2e6
|
Cleaned up and implemented fast-tape hack. I've decided it'd be better to test some other software, potentially to give multiple issues to think about, rather than sitting around with just the one.
|
2017-06-11 16:42:49 -04:00 |
|
Thomas Harte
|
d910a4fd38
|
Adjusted to signal an interrupt during the refresh cycle rather than weirdly just afterwards. Which cuts video timing down by 4 cycles a line. There still might be a problem here somewhere though, as I'm getting 206 cycles/line and the internet states it should be 207.
Also: lots of printfs have grown temporarily as I try to figure out what I'm doing so wrong as to break loading.
|
2017-06-11 13:32:20 -04:00 |
|
Thomas Harte
|
5626d35bc4
|
Tried flipping the bit meaning; decided at least to leave it in full-byte form.
|
2017-06-06 18:38:05 -04:00 |
|
Thomas Harte
|
63e0802f4e
|
Ensured tape input appears on the returned value.
|
2017-06-06 18:16:27 -04:00 |
|
Thomas Harte
|
e3ee9604a5
|
Added comments.
|
2017-06-06 18:01:33 -04:00 |
|
Thomas Harte
|
8c66e1d99d
|
Factored out ZX80/81 video and rejigged to ensure it will keep ticking over irrespective of whether the machine is supplying data.
|
2017-06-06 17:53:23 -04:00 |
|
Thomas Harte
|
ca9e8aecd6
|
Made a seemingly unsuccessful attempt to add tape input.
|
2017-06-06 10:13:32 -04:00 |
|
Thomas Harte
|
cc4cb45e9d
|
Implemented keyboard input and ensured that the signal generated is marked as composite, putting the colour-suppression ball into the CRT's court.
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2017-06-06 09:25:18 -04:00 |
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Thomas Harte
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ebbf6e6133
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Surprisingly, I think this may actually be the correct output: stopped throwing away the I part of the refresh register and flipped black and white.
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2017-06-06 09:03:09 -04:00 |
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Thomas Harte
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cba07dec7e
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Doubled up to display all eight pixels. To confirm that they are the wrong pixels.
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2017-06-06 08:59:00 -04:00 |
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Thomas Harte
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6f7037b2b1
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Made an initial stab at outputting half the correct pixels.
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2017-06-06 08:55:07 -04:00 |
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Thomas Harte
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ef4b2f963d
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Probably more-or-less corrected. But this is all a bit too interdependent.
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2017-06-05 23:52:56 -04:00 |
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Thomas Harte
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97f3ff03b6
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Restored white background and attempted to correct output timing deficiencies. Incomplete success.
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2017-06-05 23:50:04 -04:00 |
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Thomas Harte
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2fbc7a2869
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Made a very basic attempt at getting something that at least demarcates proper graphics output.
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2017-06-05 23:32:49 -04:00 |
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Thomas Harte
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4983718df7
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Got to outputting something to the CRT. Should be just proper syncs and a paper background. It's not synchronising properly, so something is amiss in my timing.
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2017-06-05 10:47:42 -04:00 |
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Thomas Harte
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23ca00fd9a
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Added memory fuzzing as a way to verify state being written by the Z80. Eventually discovered the HALT problem as fixed in the last commit, so have stripped away the caveman stuff again.
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2017-06-05 10:36:07 -04:00 |
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Thomas Harte
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893f61b490
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Attempted specifically to reproduce the 1kb ZX80 memory map in the hope of getting compact lines and in case mirroring is why I'm getting completely empty video reads. Still no action.
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2017-06-05 09:38:49 -04:00 |
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Thomas Harte
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7e3a46c33e
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[Re]discovered that sync may also be a product of the interrupt cycle. So started looking into that.
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2017-06-04 21:54:55 -04:00 |
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Thomas Harte
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73654d51dd
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Wired up actually to run.
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2017-06-04 18:37:13 -04:00 |
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Thomas Harte
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096551ab3e
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Made a first attempt to hash out the ZX80's bus. Video output isn't yet going though. Can't seem to find clarity on whether horizontal sync is really programmatic. Let's see.
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2017-06-04 18:32:23 -04:00 |
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Thomas Harte
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c485c460f7
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Imported the ZX80 and 81 system ROMs (though not publicly), added enough code to post their contents into C++ world.
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2017-06-04 18:08:35 -04:00 |
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Thomas Harte
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d2637123c4
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Added necessary support to get as far as an empty window when attempting to load a piece of ZX80 software.
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2017-06-04 17:55:19 -04:00 |
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Thomas Harte
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2562306802
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Merge branch 'master' into Z80
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2017-05-16 21:05:00 -04:00 |
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Thomas Harte
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2ee8a7056e
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Corrected TIA no longer to assume phase is an automatic quarter askew.
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2017-05-16 20:43:28 -04:00 |
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Thomas Harte
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a5075d9eb5
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Formalised the reasoning behind the colour phase fix-up and made it an opt-in per-caller value. Only the Oric currently needs to opt in.
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2017-05-16 20:31:39 -04:00 |
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Thomas Harte
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eb8a2de5d6
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Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80.
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2017-05-15 07:38:59 -04:00 |
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Thomas Harte
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0808e9b6fb
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Pulled the 6502 into a CPU namespace, making it an instance of something that has micro-opcodes and schedules them, and factoring out the formulation of a register pair.
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2017-05-14 22:08:15 -04:00 |
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Thomas Harte
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8e35e913bb
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Formally withdrew the 'load automatically' option for the Vic, having removed that option elsewhere.
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2017-05-14 16:59:24 -04:00 |
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Thomas Harte
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5d91a2600d
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Permitted ROM-style PRGs that are not a power-of-two in size, and added extra safety checks on loading data from a tape.
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2017-05-08 22:15:35 -04:00 |
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Thomas Harte
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cb66c7e2dc
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Performed some minor tidying.
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2017-05-08 21:05:35 -04:00 |
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Thomas Harte
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61f8f2f18c
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Switched to a more straightforward way of exiting from tape data loading.
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2017-05-08 20:58:55 -04:00 |
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Thomas Harte
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7b43ae0a92
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Implemented a catch for loading the data portion of files.
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2017-05-07 22:22:59 -04:00 |
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Thomas Harte
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2807e3134f
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Implemented speedy header finding. So that's half of it.
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2017-05-07 20:32:48 -04:00 |
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Thomas Harte
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0771363f3b
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Removed one piece of unnecessary logging.
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2017-05-06 22:22:03 -04:00 |
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Thomas Harte
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2edf73908c
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Temporarily disabled the existing fast loading implementation in pursuit of another, and started trying to correct the lack of connection between the userport VIA and the tape drive.
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2017-05-06 22:00:12 -04:00 |
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Thomas Harte
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ed6b135015
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Made final switch to permit high-sampling rate Atari audio.
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2017-04-15 21:18:00 -04:00 |
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Thomas Harte
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f95015c7f6
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Pulled out the divisor for audio.
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2017-04-03 21:16:39 -04:00 |
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Thomas Harte
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814c0ada13
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Fixed action counts for border motion.
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2017-03-26 18:33:05 -04:00 |
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Thomas Harte
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dfc468f220
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Locked down all initial state.
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2017-03-26 15:47:04 -04:00 |
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