Thomas Harte
|
f0398a6db8
|
Added wait state hooks to the interrupt programs, and added an is_wait query on PartialMachineCycle.
|
2017-06-22 20:07:47 -04:00 |
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Thomas Harte
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7eeac3b586
|
Switched R back to incrementing after the refresh cycle. It had snuck to before by virtue of subdivision of the M1 cycle. Which shortened the ZX80 line time, breaking synchronisation.
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2017-06-21 21:11:00 -04:00 |
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Thomas Harte
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0e0ce379b4
|
Renamed MachineCycle to PartialMachineCycle given that it mostly no longer intends to describe an entire machine cycle.
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2017-06-21 20:38:08 -04:00 |
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Thomas Harte
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36e8a11505
|
Sought to simplify the way partial machine cycles are communicated, for ease of machine implementation. Also implemented the wait line.
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2017-06-21 20:32:08 -04:00 |
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Thomas Harte
|
45f442ea63
|
Corrected interrupt mode 2: was both failing properly to load the vector address, and failing to read from it.
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2017-06-21 19:08:48 -04:00 |
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Thomas Harte
|
db743c90d8
|
Had neglected to count refresh time in my interrupt programs. Corrected. Mode 0 timing test succeeds again. Only Mode 2 is now at fault.
|
2017-06-21 18:58:44 -04:00 |
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Thomas Harte
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10cc94f581
|
Attempted to fix interrupt response timing; ensured initial interrupt mode is one that won't jump beyond the interrupt response program table's length, and that the conditionals other than CALL definitely have no alternative program attached.
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2017-06-21 18:47:00 -04:00 |
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Thomas Harte
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108da64562
|
Fixed LD H, (HL) and LD L, (HL) by ensuring that whatever the subclass does goes to a temporary place before updating the address. Corrected the LD (IX+d), n machine cycle test for my new best-guess timing. This should leave only interrupt timing as currently amiss.
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2017-06-20 22:25:00 -04:00 |
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Thomas Harte
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f85b46286e
|
Resolved the timing disparity between LD (HL),n and LD (IX+d), n, hopefully having come up with a convincing theory of timing for the latter.
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2017-06-20 22:20:58 -04:00 |
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Thomas Harte
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184b371649
|
Attempted to get to 'proper' timing for LD (IX+d),n, albeit that proper is a guess.
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2017-06-20 21:48:50 -04:00 |
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Thomas Harte
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b0375bb037
|
Fixed the three LD rr, (nn) operations. Back down to four FUSE failures.
|
2017-06-20 21:32:23 -04:00 |
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Thomas Harte
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48942848e7
|
Fixed (Ix+d) read timing. I've put an extra wait cycle into the read, so no need to extend the refresh.
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2017-06-20 21:15:56 -04:00 |
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Thomas Harte
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27ac342928
|
Corrected conditional call timing, and its test.
|
2017-06-20 20:57:23 -04:00 |
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Thomas Harte
|
25aba16ef8
|
Quickly checking the FUSE tests, corrected a handful of instances where PC should be modified but isn't, correcting around 800 new failures.
|
2017-06-19 22:20:23 -04:00 |
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Thomas Harte
|
a0d0f383c8
|
Corrected unconditional CALL timing. Conditional's going to require more work because once the wait state is put into the right place, it breaks the assumption under which the Z80 handles conditions — that they're either do something or else do nothing. So that can wait a day.
|
2017-06-19 22:07:36 -04:00 |
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Thomas Harte
|
cc8f316941
|
Resolved read-modify-write (IX+d) timing, and therefore RLC (IX+d).
|
2017-06-19 20:51:28 -04:00 |
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Thomas Harte
|
b684254908
|
Introduced further tests down to a failing attempt at RLC (IX+d). Made an initial attempt to fix, failed.
|
2017-06-19 20:33:34 -04:00 |
|
Thomas Harte
|
ba15371948
|
Introduced timing tests for LDI[R] and CPI[R], fixing a latent issue in the rejig of LD BC, nn while I'm here.
|
2017-06-19 19:47:00 -04:00 |
|
Thomas Harte
|
73dbaebbc1
|
Fixed timing of EX (SP), HL/IX.
|
2017-06-19 19:25:53 -04:00 |
|
Thomas Harte
|
e3244eb68e
|
Rephrased internal operation machine cycles as having only an end. So they're now easy to count. Hence the test machine spots them, and a couple more of the current timing subset passes.
|
2017-06-19 07:39:46 -04:00 |
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Thomas Harte
|
54e4643396
|
Corrected non-default refresh cycle lengths. Reduces failures of the currently-tested timing subset from 10 to 4.
|
2017-06-19 07:34:23 -04:00 |
|
Thomas Harte
|
85c5c4405a
|
Ensured that wait states don't appear unless requested (TODO: requesting), and made the output of my timing tests a little easier to parse.
|
2017-06-19 07:30:01 -04:00 |
|
Thomas Harte
|
d668879ba6
|
Started trying to wade back to passing tests. Working on the new timing tests first, and focussing on getting the Objective-C test machine to compile bus operations into machine cycles, which means indicating phase to all-RAM delegates.
|
2017-06-18 22:03:13 -04:00 |
|
Thomas Harte
|
cb140aa06e
|
Managed to navigate back to building.
|
2017-06-18 21:00:44 -04:00 |
|
Thomas Harte
|
6a769d3953
|
Finally dipped below the 20 error threshold that the compiler tops out at.
|
2017-06-18 20:34:46 -04:00 |
|
Thomas Harte
|
3be8ffd826
|
Some correct timings have gone out the window for now, but only the final quarter of the base page now contains compiler errors.
|
2017-06-18 20:31:12 -04:00 |
|
Thomas Harte
|
bb910e14a4
|
Dealt with the CB page.
|
2017-06-18 18:01:33 -04:00 |
|
Thomas Harte
|
69ebbe019a
|
Completed ED page conversion. Rolling onwards...
|
2017-06-18 17:56:48 -04:00 |
|
Thomas Harte
|
0d39672d32
|
Fixing typos here and there, persuaded the first half of the ED table to compile.
|
2017-06-18 17:48:54 -04:00 |
|
Thomas Harte
|
0d1231980a
|
Advanced to getting specific warnings in the ed-page table. So that's progress.
|
2017-06-18 17:25:15 -04:00 |
|
Thomas Harte
|
82a015892b
|
Started adapting to the newly-segmented world.
|
2017-06-18 17:18:01 -04:00 |
|
Thomas Harte
|
194b7f60c5
|
Rephrased to allow non-conditional waits; expanded macros to cover all permitted lengths of read and write.
|
2017-06-18 17:08:50 -04:00 |
|
Thomas Harte
|
ebc7356db5
|
Reformulated the machine cycle slightly to support posting operation plus phase, thereby exposing the segue points at which waits might be inserted. So: to stick to the rule that CPUs expose the minimum amount of information sufficient completely to reconstruct bus activity. This breaks the Z80 for now.
|
2017-06-18 12:21:27 -04:00 |
|
Thomas Harte
|
e1a2580b2a
|
Renamed BusOperation to MachineCycle::Operation.
|
2017-06-17 21:53:45 -04:00 |
|
Thomas Harte
|
efc7f9df37
|
Combined I and R into a register pair.
|
2017-06-17 18:18:28 -04:00 |
|
Thomas Harte
|
aed2827e7b
|
Implemented a rudimentary way to test that instructions take as long as the FUSE tests think they should. Hence discovered that the (HL)-accessing BIT, RES and SET weren't. Corrected.
|
2017-06-12 22:22:00 -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
|
d12e50eb02
|
Corrected "should I adjust history?" tests.
|
2017-06-11 16:41:34 -04:00 |
|
Thomas Harte
|
db30f53ab0
|
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.
|
2017-06-11 13:31:02 -04:00 |
|
Thomas Harte
|
b55579c348
|
Fixed usage of flush: the subclass version is definitively used.
|
2017-06-06 17:52:44 -04:00 |
|
Thomas Harte
|
3df6eba237
|
Fixed: my HALT line wasn't actually halting. NOPs followed, but the PC just kept counting.
|
2017-06-05 10:35:03 -04:00 |
|
Thomas Harte
|
e940e02126
|
Added a short circuit to set_interrupt_line, mostly to make breakpoints slightly more convenient to place.
|
2017-06-05 09:37:19 -04:00 |
|
Thomas Harte
|
7f743c6fb0
|
Got explicit about permitted type conversions.
|
2017-06-04 18:40:59 -04:00 |
|
Thomas Harte
|
096551ab3e
|
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.
|
2017-06-04 18:32:23 -04:00 |
|
Thomas Harte
|
c485c460f7
|
Imported the ZX80 and 81 system ROMs (though not publicly), added enough code to post their contents into C++ world.
|
2017-06-04 18:08:35 -04:00 |
|
Thomas Harte
|
d2637123c4
|
Added necessary support to get as far as an empty window when attempting to load a piece of ZX80 software.
|
2017-06-04 17:55:19 -04:00 |
|
Thomas Harte
|
0eebfdb4cc
|
Expanded emulation of memptr, though still incomplete. Reverted zexall tests to zexdoc. Will probably leave memptr until I've an emulated machine as test suites seem to exist, but they're machine-dependant, so figuring out how to isolate them from an architecture will be a lot easier if and when I have functioning machines.
|
2017-06-04 15:39:37 -04:00 |
|
Thomas Harte
|
7811374b0f
|
Started sneaking in memptr emulation, hopefully to get to a working BIT (hl).
|
2017-06-04 15:07:07 -04:00 |
|
Thomas Harte
|
a2f01b4a46
|
Corrected CPx bit 3 and 5 flags. I think only BIT n, (HL) with the famous MEMPTR reliance is preventing a complete pass by Zexall now.
|
2017-06-04 14:59:18 -04:00 |
|
Thomas Harte
|
f5c910beb7
|
Fixed LDIR/LDDR bit 3/5 flags. This seems once again to satisfy FUSE.
|
2017-06-04 14:18:04 -04:00 |
|
Thomas Harte
|
4e014ca748
|
Ensured BIT takes bits 5 and 3 from the computed address if used on indexed pages. That seems to cover 97 failures out of 100?
|
2017-06-04 14:13:38 -04:00 |
|
Thomas Harte
|
3ceef2005b
|
Pulled the Z80 from the MicroOpScheduler inheritance tree as it barely uses the thing, and that allows me to make the MicroOp structure private.
|
2017-06-03 19:17:34 -04:00 |
|
Thomas Harte
|
24c84ca6f5
|
Commented out as-yet-unimplemented features.
|
2017-06-03 19:10:23 -04:00 |
|
Thomas Harte
|
7898f643ac
|
Added bus request/acknowledge logic.
|
2017-06-03 19:09:47 -04:00 |
|
Thomas Harte
|
7bd45d308a
|
Error was simply failure of the interrupt-mode setter. Fixed.
|
2017-06-03 18:58:13 -04:00 |
|
Thomas Harte
|
b3da16911f
|
Tweaked timing of mode 0, per contradictory information. Wrote a failing test of mode 2.
|
2017-06-03 18:42:54 -04:00 |
|
Thomas Harte
|
3e9212aaff
|
Plumbed through to allow interrupt tests, wrote an NMI test, corrected the error revealed.
|
2017-06-03 17:41:45 -04:00 |
|
Thomas Harte
|
a2ec902773
|
Made an attempt at implementing all three modes of IRQ.
|
2017-06-03 17:07:05 -04:00 |
|
Thomas Harte
|
1c0130fd02
|
Cleaned up with a macro, and decided to make absolutely sure that DecodeOperation is functioning as intended by removing the MoveToNextProgram from fetch-decode-execute.
|
2017-06-03 12:19:25 -04:00 |
|
Thomas Harte
|
3e3d6f97f4
|
Edged towards being able to implement interrupt mode 0: created a special-case micro-op for incrementing the PC, and formalised that DecodeOperation is a terminal operation.
|
2017-06-03 12:16:21 -04:00 |
|
Thomas Harte
|
9c3bda0111
|
Attempted to round out NMI handling.
|
2017-06-03 11:30:12 -04:00 |
|
Thomas Harte
|
c95c32a9fe
|
Implemented the reset line program and disabled fictitious automatic power-on reset for the Z80 test machine.
|
2017-06-01 22:31:04 -04:00 |
|
Thomas Harte
|
35e045d7a7
|
Made a first attempt at the correct segue into the three main kinds of interrupt, though the programs aren't written yet. So undefined behaviour would abound were an interrupt to occur. But it lets me figure out what effect the check has on performance. I hope little.
|
2017-06-01 22:16:22 -04:00 |
|
Thomas Harte
|
084e1f3d51
|
Added a latching of interrupt status before each bus operation, and reset and power-on inputs.
|
2017-06-01 21:40:08 -04:00 |
|
Thomas Harte
|
5b43cefb85
|
Started filling an appropriate mask variable with the interrupt request status right now. Which is step one towards implementing interrupts.
|
2017-06-01 20:34:52 -04:00 |
|
Thomas Harte
|
7d9b197383
|
Pulled the .get() call for fetch-decode-execute out of the main loop.
|
2017-06-01 18:28:04 -04:00 |
|
Thomas Harte
|
c9dd267ec1
|
Sketched an interface for signalling interrupts and pulled out some of the repetition in flag setting from ADD/ADC/SUB/SBC/CP.
|
2017-05-31 22:51:32 -04:00 |
|
Thomas Harte
|
a5254989f8
|
Rewired the Z80 not to use the program queue, as it's not proven a useful abstraction in practice and doing so yields an immediate 22% speed increase.
|
2017-05-31 20:15:56 -04:00 |
|
Thomas Harte
|
b99e4210ba
|
Eliminated pointless abstraction; I ended up going indirect on instruction pages rather than scheduling methods.
|
2017-05-31 19:57:03 -04:00 |
|
Thomas Harte
|
d3b74cbc91
|
Set proper initial value for number_of_cycles_.
|
2017-05-31 19:55:51 -04:00 |
|
Thomas Harte
|
b5c1773d59
|
Eliminated another conditional. Albeit a very predictable one.
|
2017-05-30 22:15:43 -04:00 |
|
Thomas Harte
|
dfb5057342
|
Moved repetition group conditions explicitly into the switch statement.
|
2017-05-30 22:12:10 -04:00 |
|
Thomas Harte
|
7bddd294c9
|
Resolved an unpredictable conditional and temporarily disabled the Zexalltest as part of the default suite, since it takes so long to run.
|
2017-05-30 21:03:02 -04:00 |
|
Thomas Harte
|
b5ad910b81
|
Merge branch 'Z80' into StraightPointer
|
2017-05-30 19:25:38 -04:00 |
|
Thomas Harte
|
da65bae86e
|
Switched to supplying the bus operation by reference, go guarantee that it isn't null.
|
2017-05-30 19:24:58 -04:00 |
|
Thomas Harte
|
a0189a6fe1
|
Switched to following the current program via address.
|
2017-05-30 18:49:40 -04:00 |
|
Thomas Harte
|
c6185baa99
|
Fixed R incrementation and attempted to make the status flags cheaper to write to.
|
2017-05-29 22:23:19 -04:00 |
|
Thomas Harte
|
9d29cefe75
|
Evicted manual memory management.
|
2017-05-29 21:44:33 -04:00 |
|
Thomas Harte
|
35f535b9a3
|
Noodled around with initial state.
|
2017-05-29 19:25:08 -04:00 |
|
Thomas Harte
|
8bfaa487ce
|
Improved logging of bus operations and corrected placement of the OUT step in that repetition group; was otherwise outputting the wrong side of the B adjustment and therefore to the wrong port (if interpreted as 16 bit).
|
2017-05-29 17:13:24 -04:00 |
|
Thomas Harte
|
0d067d2f01
|
Adjusted OTI/etc timing; 23 failures outstanding.
|
2017-05-29 16:54:45 -04:00 |
|
Thomas Harte
|
d66755fd1e
|
Corrected INI/D[r] timing. Down to 45 failures.
|
2017-05-29 16:50:52 -04:00 |
|
Thomas Harte
|
8a8f0cef20
|
With all intentional opcode entry points now covered, commuted XX into NOP to give proper meaning to otherwise undefined codes.
|
2017-05-29 12:25:10 -04:00 |
|
Thomas Harte
|
91dc0d5f4a
|
Adjusted HALT to issue never-ending M1 fetches on the next instruction.
|
2017-05-29 12:20:33 -04:00 |
|
Thomas Harte
|
ed7b07c8b1
|
Made an attempt to implement HALT as an operation that merely leaves the PC in place, adding the Z80's output line. Included that flag in FUSE tests. Discovered that it does not think that HALT acts that way. Which is probably correct.
|
2017-05-29 11:54:27 -04:00 |
|
Thomas Harte
|
3f880fa769
|
Fixed [FD/DD][74/75], which always store H or L, never IXh, IXl, IYh or IYl.
|
2017-05-29 11:44:26 -04:00 |
|
Thomas Harte
|
d83dd17738
|
[DD/FD]36 turns out to be a timing error: offset calculation overlaps with value fetch. So the FUSE test was cutting off my implementation early. Fixed.
|
2017-05-29 11:40:56 -04:00 |
|
Thomas Harte
|
c322410783
|
Corrected CP[I/D]R termination logic; all tests now passing to the extent of interrogation.
|
2017-05-29 10:52:54 -04:00 |
|
Thomas Harte
|
b67331e018
|
Fixing the OUT repetition group reduces the code to one failing test.
|
2017-05-29 10:48:53 -04:00 |
|
Thomas Harte
|
a47b339668
|
Made an attempt at OUT[I/D]R. 10 failures remaining. None of which, I guess, are due to unimplemented operations.
|
2017-05-29 10:28:04 -04:00 |
|
Thomas Harte
|
ad56a9215c
|
Implemented IN[I/D]x. 18 failures remaining.
|
2017-05-29 10:12:33 -04:00 |
|
Thomas Harte
|
c56a5344b9
|
Implemented CP[I/D]x.
|
2017-05-29 08:54:00 -04:00 |
|
Thomas Harte
|
1f62cbe21a
|
Reduced LD[I/D}{R} repetition.
|
2017-05-29 08:24:10 -04:00 |
|
Thomas Harte
|
47845f8c19
|
Tried to complete the LD[I/D]{R} group. 32 issues remain.
|
2017-05-28 23:55:54 -04:00 |
|
Thomas Harte
|
409c82ce73
|
Implemented RLD and RRD. 34 failures remaining.
|
2017-05-28 16:46:27 -04:00 |
|
Thomas Harte
|
dc3f5b6211
|
Fixed flag setting for LD A, I and LD A, R, and corrected typo affecting LD DE, (nn).
|
2017-05-28 16:32:10 -04:00 |
|
Thomas Harte
|
fb02b77e63
|
Implemented RETI/RETN. 40 warnings remaining.
|
2017-05-28 16:07:25 -04:00 |
|
Thomas Harte
|
f974d54c7a
|
Implemented IM. 48 failures remain.
|
2017-05-28 15:55:21 -04:00 |
|
Thomas Harte
|
68978c6e25
|
Implemented NEG and filled in the load/store and copy parts of the ED page that roll directly off the tongue. 53 issues outstanding.
|
2017-05-28 15:47:48 -04:00 |
|
Thomas Harte
|
5a4d448cc1
|
Corrected logical flags; now down to 68 failures, all of them on the ED page.
|
2017-05-28 15:09:58 -04:00 |
|