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312 Commits

Author SHA1 Message Date
Thomas Harte
e1aded0d95 Allows Z80 users to opt out of support for the bus request line. Which both now do. 2017-08-21 20:43:12 -04:00
Thomas Harte
6315c22b80 Removed repeated checking of bus_request_line_. It's now checked only after each outward perform_machine_cycle. 2017-08-20 12:39:45 -04:00
Thomas Harte
039811ce6a Switched the Z80 to being something a machine has, not something a machine is. 2017-08-02 22:09:59 -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
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
37950143fc Attempted to nudge wait timing onto half-cycle boundaries, which expands the number of partial machine cycles the Z80 can post but pleasingly also regularises them. Switched the AllRAMProcessor to reporting half cycles by default and corrected all Z80 tests. 2017-07-27 20:17:13 -04:00
Thomas Harte
60e374dca3 Merge branch 'master' into Memptr 2017-07-27 07:54:25 -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
847e49ccdf Corrected timestamp reporting by the all-RAM Z80. 2017-07-26 19:47:39 -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
9257a3f6d7 Added test for 16-bit arithmetic, and fixed implementation. 2017-07-26 19:04:52 -04:00
Thomas Harte
6ec4e4e3d7 Merge branch 'master' into Memptr 2017-07-25 23:01:34 -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
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
9bff787ee1 Corrected for the new, non-integral type. 2017-07-24 21:05:07 -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
ace8e30818 Bubbled the Z80's move into clock receiver territory up into the Z80 test machine. 2017-07-23 22:21:39 -04:00
Thomas Harte
ec3aa06caf Removed dangling reference. 2017-07-23 22:16:00 -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
20a6bcc676 Added tests for the various LD (nn), rr instructions and corrected implementation to pass. 2017-07-22 11:39:13 -04:00
Thomas Harte
eaf313b0f6 Added a test on LD A, (DE) and LD A, (BC), and adjusted implementation to pass. 2017-07-22 11:20:21 -04:00
Thomas Harte
d51b66c204 Expanded test to hit all 65536 possibilities (and not to allocate a fresh Z80 test machine each time, as that's unnecessary and slow), and fixed implementation to pass test. 2017-07-21 23:01:35 -04:00
Thomas Harte
540a03f75c Exposed the memptr register. 2017-07-21 22:31:42 -04:00
Thomas Harte
9b72c445a7 Fixed indexing type. 2017-07-21 21:19:46 -04:00
Thomas Harte
aec4fd066b I think I've definitively decided against this model of timing. 2017-06-22 21:32:14 -04:00
Thomas Harte
95a6b0f85c Introduced an NMI/wait interrupt timing test, and adjusted the Z80 to conform to information posted by Wilf Rigter. 2017-06-22 21:09:26 -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
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
Thomas Harte
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. 2017-06-21 21:11:00 -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
45f442ea63 Corrected interrupt mode 2: was both failing properly to load the vector address, and failing to read from it. 2017-06-21 19:08:48 -04:00
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
Thomas Harte
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. 2017-06-21 18:47:00 -04:00
Thomas Harte
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. 2017-06-20 22:25:00 -04:00
Thomas Harte
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. 2017-06-20 22:20:58 -04:00
Thomas Harte
184b371649 Attempted to get to 'proper' timing for LD (IX+d),n, albeit that proper is a guess. 2017-06-20 21:48:50 -04:00
Thomas Harte
b0375bb037 Fixed the three LD rr, (nn) operations. Back down to four FUSE failures. 2017-06-20 21:32:23 -04:00
Thomas Harte
48942848e7 Fixed (Ix+d) read timing. I've put an extra wait cycle into the read, so no need to extend the refresh. 2017-06-20 21:15:56 -04:00
Thomas Harte
27ac342928 Corrected conditional call timing, and its test. 2017-06-20 20:57:23 -04:00
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
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
Thomas Harte
cc8f316941 Resolved read-modify-write (IX+d) timing, and therefore RLC (IX+d). 2017-06-19 20:51:28 -04:00
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
Thomas Harte
85c6fb1430 Explained refresh cycles to the all-RAM Z80. 2017-06-19 07:36:11 -04:00
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
8c41a0f0ed Added a test to confirm interrupts are disabled, and a response to the interrupt cycle within the all-RAM machine. 2017-06-03 17:53:44 -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
d14902700a Minor syntax and wiring fixes. 2017-06-01 22:33:05 -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
494ce073b5 Tests having been fixed by instating proper Z80 cycle counting, removed caveman logging. 2017-05-31 19:58:57 -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
2f7f11e2e5 Added diagnosis props. 2017-05-31 06:54:25 -04:00
Thomas Harte
5119997122 Made an attempt, flawed so far, to find a neat way for processor subclasses to offer bus management as an inline function. 2017-05-30 22:41:23 -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
d290e3d99e Corrected simple logging error. Which mysteriously moves me all the way up to 117 failures (!) 2017-05-29 16:35:00 -04:00
Thomas Harte
a6a4c5a936 Made an attempt to introduce checking of bus activity against the FUSE tests. Appears to suggest 54 new failures. 2017-05-29 15:57:27 -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
Thomas Harte
743eac8c55 Implemented EXX to complete the base page. 83 failures. 2017-05-28 14:55:14 -04:00
Thomas Harte
6b66c8f304 Implemented inputs and outputs, determined how to answer port requests to please FUSE and hence reduced failures to 84. 2017-05-28 14:50:51 -04:00
Thomas Harte
c976fbfcd5 Implemented the base-page IN and OUT instructions, bringing FUSE test failures down to 91. 2017-05-28 14:20:05 -04:00
Thomas Harte
ed3e38ac31 Performed some quick tidying. 2017-05-28 00:12:42 -04:00
Thomas Harte
76f03900d2 Implemented EX HL, (SP) so as, allowing for indexed pages, to bring issues below the psychological 100 barrier. To 99. 2017-05-28 00:02:14 -04:00
Thomas Harte
9759a04c7d Timing fixes: the fetch-decode-execute pattern is now per-page, since that on [DD/FD]CB not only doesn't increment R but doesn't take four cycles, so is probably a normal read cycle. Adjusted timing all around. 2017-05-27 23:54:06 -04:00
Thomas Harte
0d2d04e17b Seeking proper [F/D]DCB emulation: the offset comes before the final byte of opcode, and adding seems to overlap with the opcode fetch, which does not increment R. Also needs to duplicate the result to visible registers. 2017-05-27 21:06:56 -04:00
Thomas Harte
98423c6e41 Accepted FUSE's view of bits 3 & 5 from BIT and RES, reducing to 623 issues. 2017-05-27 16:19:15 -04:00
Thomas Harte
33c3fa21e3 Fixed (HL)/(In + d) CB page modify instructions. Reducing failures to 672. 2017-05-27 15:54:24 -04:00
Thomas Harte
2141d52794 Corrected typo. Now at 696 failures. 2017-05-27 15:41:26 -04:00
Thomas Harte
16b8021401 Made a stab at the CB pages. 2017-05-27 15:39:22 -04:00
Thomas Harte
151b09b5ca Fixed various other obvious cases for indexing. 2017-05-26 23:37:17 -04:00
Thomas Harte
9bc2b48d9b Found a form I like for indexed addressing, applying it only where obvious for now. Which eliminates more than a couple of hundred of remaining failures. 2017-05-26 23:23:33 -04:00