Thomas Harte
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d910a4fd38
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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.
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2017-06-11 13:32:20 -04:00 |
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Thomas Harte
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db30f53ab0
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Added the capacity to back-date interrupt line changes within a machine cycle, so that machines which time themselves entirely within perform_machine_cycle can still be cycle accurate on those changes.
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2017-06-11 13:31:02 -04:00 |
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Thomas Harte
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50be3a24fe
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Sought to ensure that Mode 1 interrupts aren't happening early. Which they seem not to be.
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2017-06-11 13:30:08 -04:00 |
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Thomas Harte
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256ba4028b
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Rejigged to eliminate semi-duplication of the is-a-file test.
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2017-06-08 21:52:13 -04:00 |
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Thomas Harte
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b07af2660d
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Adjusted to make sure that the very end of a tape is properly measured.
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2017-06-08 21:33:35 -04:00 |
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Thomas Harte
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bc0d70b2f7
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Added: a shout-out when the tape has been exhausted.
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2017-06-08 21:32:27 -04:00 |
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Thomas Harte
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c6e48dfd56
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Given that a final gap is semantically part of describing tape contents, ensured one formally appears before declaring that the tape has ended.
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2017-06-08 21:31:54 -04:00 |
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Thomas Harte
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c775db50ef
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Ensured no out-of-bounds accesses.
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2017-06-08 21:31:03 -04:00 |
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Thomas Harte
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ee4c8b5ad2
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Ensured final byte plays out.
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2017-06-08 19:51:49 -04:00 |
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Thomas Harte
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d8b76e31c3
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Added and improved the is-this-ZX80-stuff test. It seems some bytes are going missing in the to->from tape conversion.
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2017-06-08 19:49:18 -04:00 |
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Thomas Harte
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7e10c7f9d8
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Relocated the ZX80/81 concept of a 'file' out from Tape into Data, given that it's an exact duplicate of memory.
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2017-06-08 19:09:51 -04:00 |
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Thomas Harte
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c47128f433
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Widened tolerances and ensured zero bits aren't prematurely discarded.
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2017-06-07 17:50:03 -04:00 |
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Thomas Harte
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8aab9acc10
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Eliminated use of the zero level; now definitively returns a low/high input.
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2017-06-07 17:39:29 -04:00 |
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Thomas Harte
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350b36df25
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Wired in an attempted usage of the new tape parser.
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2017-06-07 17:30:53 -04:00 |
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Thomas Harte
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dbd2944c13
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Took an initial run at the ZX80/81 parser.
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2017-06-07 17:27:05 -04:00 |
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Thomas Harte
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4603fa6f24
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Extended explicitly to support a token of lookahead, which is pretty much what was on offer anyway. Also corrected instance variable names, as per better adoption of C++ norms.
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2017-06-07 17:21:57 -04:00 |
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Thomas Harte
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60300851ea
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Started sketching out a tape parser for ZX80 and '81 files. I think this'll help me to verify whether the .O input is working.
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2017-06-07 10:12:13 -04:00 |
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Thomas Harte
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58312ea2b7
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Updated to new standardisation on curly bracket placement.
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2017-06-07 10:05:43 -04:00 |
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Thomas Harte
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cb534d8b85
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Corrected comment.
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2017-06-07 10:05:16 -04:00 |
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Thomas Harte
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5626d35bc4
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Tried flipping the bit meaning; decided at least to leave it in full-byte form.
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2017-06-06 18:38:05 -04:00 |
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Thomas Harte
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4677cebf40
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Rejigged to correct: spaces go after bits, not after bytes.
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2017-06-06 18:29:15 -04:00 |
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Thomas Harte
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7399f3d798
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Caveman debugging in place, it looks like this file is returning nonsense.
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2017-06-06 18:18:55 -04:00 |
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Thomas Harte
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faeecf7665
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Made sure that there's nothing but silence at the end of the tape, even if the .O file is too long.
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2017-06-06 18:16:47 -04:00 |
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Thomas Harte
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63e0802f4e
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Ensured tape input appears on the returned value.
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2017-06-06 18:16:27 -04:00 |
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Thomas Harte
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e3ee9604a5
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Added comments.
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2017-06-06 18:01:33 -04:00 |
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Thomas Harte
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8c66e1d99d
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Factored out ZX80/81 video and rejigged to ensure it will keep ticking over irrespective of whether the machine is supplying data.
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2017-06-06 17:53:23 -04:00 |
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Thomas Harte
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b55579c348
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Fixed usage of flush: the subclass version is definitively used.
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2017-06-06 17:52:44 -04:00 |
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Thomas Harte
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ca9e8aecd6
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Made a seemingly unsuccessful attempt to add tape input.
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2017-06-06 10:13:32 -04:00 |
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Thomas Harte
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cc4cb45e9d
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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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3df6eba237
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Fixed: my HALT line wasn't actually halting. NOPs followed, but the PC just kept counting.
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2017-06-05 10:35:03 -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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e940e02126
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Added a short circuit to set_interrupt_line, mostly to make breakpoints slightly more convenient to place.
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2017-06-05 09:37:19 -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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7f743c6fb0
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Got explicit about permitted type conversions.
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2017-06-04 18:40:59 -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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b0a7c58287
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Fixed project to point to the XIB I actually want to keep; fixed that XIB to have the correct contents.
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2017-06-04 17:57:37 -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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02b7c3d1b0
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Added the necessary wiring to get into a ZX80/81-oriented part of the static analyser, which could in principle post a ZX80 target.
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2017-06-04 17:04:06 -04:00 |
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Thomas Harte
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8c1769f157
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Made a quick attempt at serialising from ZX80 .O to waves.
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2017-06-04 16:59:26 -04:00 |
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Thomas Harte
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655809517c
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Ensured that there is a subclass of file that is entrusted to load .O/.80 files, and that the code routes such files to it, noting that it should consider whether a ZX80 is required.
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2017-06-04 16:37:03 -04:00 |
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