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1107 Commits

Author SHA1 Message Date
Thomas Harte
ab2bcb939f Separates 6502Base into its constituent parts. 2017-09-04 11:08:33 -04:00
Thomas Harte
45499050b6 Separates Z80Base.cpp into its component classes. 2017-09-04 11:04:01 -04:00
Thomas Harte
a1e200cc65 Further strips back the amount exposed in Z80-related headers. 
Almost all opcode table generation macros and code now resides neatly in the world of .CPP.
 2017-09-01 22:19:16 -04:00
Thomas Harte
e6ac939ae0 Reintroduces missing noexcept specifier. 2017-09-01 20:51:31 -04:00
Thomas Harte
b034d4e6f8 Refactors the Z80 to separate out interface and implementation. 
Following the pattern just established by the 6502, puts all implementation specifics beyond the visibility of a human reading Z80.hpp and in subfolders so as to promote the idea that they shouldn't go out of their way.
 2017-09-01 20:50:24 -04:00
Thomas Harte
de218611e4 Corrects possible confusion as documentation recommends Cycles(0) as default, but then gives Cycles(1). 2017-09-01 20:49:24 -04:00
Thomas Harte
b306776ba9 Removes from 6502.hpp all remaining implementation details, making it purely an interface document. 
Though those details remain visible to files including 6502.hpp through necessity.
 2017-09-01 19:46:29 -04:00
Thomas Harte
4af333d5ec Tidies the 6502 template and folder hierarchy. 
Specifically: there's now just the one .h file at the top level, giving a clear indication of what a user should read. That separates implementation from interface. It also devolves a lot more to the base class because doing so makes debug builds less of a hassle. The all-RAM 6502 has been shuffled off into a subfolder, to indicate that it's not something you necessarily need know about. Also general documentation improvements have been applied: incorrect citing of the recurring-template pattern has been removed and the meaning of the two BusHandler methods has now accrued at the bus handler.
 2017-08-31 22:10:27 -04:00
Thomas Harte
fab6908129 Corrects the all-RAM Z80 to declare that it needs the wait line to be implemented. 2017-08-26 23:18:11 -04:00
Thomas Harte
57bfec285f Makes it optional whether the Z80 supports the wait line. If the wait line isn't in use, runtime costs are decreased because the optional wait cycles need not be iterated over. 2017-08-26 23:08:57 -04:00
Thomas Harte
fa19e2d9c2 Removes some detritus. 2017-08-24 22:00:21 -04:00
Thomas Harte
95d360251d Makes all of PartialMachineCycle const, with the exception of the target of *value, since that's intended to be writeable by recipients. 2017-08-24 21:32:33 -04:00
Thomas Harte
7af3de010e Suspected my mode 1 interrupt timing might be off. Reminded myself of the sources. Persuaded myself that it wasn't. Added appropriate comments. 2017-08-23 22:25:31 -04:00
Thomas Harte
ee71be0e7e Added the option not to include ready line support in the 6502 core, and took advantage of it in the Electron, Oric and Vic-20 implementations. Also tagged those as forceinline and/or override final where applicable. 2017-08-21 21:56:42 -04:00
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
42b5b66305 Remove the 6502's use of runtime polymorphism in favour of ordinary templating. 2017-08-16 11:56:52 -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
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
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
677ed463f0 Updated comment per new method name. 2017-07-24 21:19:49 -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
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
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
1a811b1ab1 Eliminated the function call inherent to every decode, and also moved the fixed table of operations into a non-templated base class. 2017-06-03 22:19:35 -04:00
Thomas Harte
c26349624c This, of course, should be inline to gain any benefit from the slightly-tortured private implementation. 2017-06-03 22:00:57 -04:00
Thomas Harte
b642d9f712 Eliminates the 6502's specialised jam handler in favour of the generic trap handler, and simplifies the lookup costs of that as it's otherwise doubling execution costs. 2017-06-03 21:54:42 -04:00
Thomas Harte
fd6623b5a5 Attempted to bring a common hierarchy to the Z80 and 6502 test machines, particularly with a view to eliminating the special-case Jam stuff on the 6502. 2017-06-03 21:22:16 -04:00
Thomas Harte
b304c3a4b9 Eliminated the 6502's reliance on the micro-op scheduler. 2017-06-03 20:30:07 -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
aab637c9e7 Made check_address_for_trap inlineable. 2017-06-01 18:28:34 -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
01f7394f7f Corrected 6502 scheduling when flushing the pipeline. 2017-05-30 20:58:07 -04:00
Thomas Harte
5aa8b03349 Attempted to regularise the 6502 with the Z80 as to scheduling. I think that at least one bug remains. 2017-05-30 20:36:53 -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
Thomas Harte
ab8a98f1df Implemented RST. 2017-05-26 07:29:19 -04:00
Thomas Harte
efe354a7b1 Fixed half carry after logical operation.s 2017-05-25 22:55:04 -04:00
Thomas Harte
d50d3fc837 Implemented CPL, SCF and CCF. 2017-05-25 22:51:08 -04:00
Thomas Harte
83ee92af1a Made DAA work sufficiently well for the FUSE test. 2017-05-25 22:41:05 -04:00
Thomas Harte
ea0ad9fd87 Took a shot at DAA, seemingly not to Fuse's liking though. 2017-05-25 22:17:48 -04:00
Thomas Harte
ff3c60c0e1 Implemented the conditional JRs. 2017-05-25 21:51:30 -04:00
Thomas Harte
399703a471 Implemented JR. 2017-05-25 21:48:28 -04:00
Thomas Harte
82017c4aea Implemented DJNZ. 2017-05-25 21:44:24 -04:00
Thomas Harte
bdf07c3dc9 Implemented EX AF, AF'. 2017-05-25 21:26:32 -04:00
Thomas Harte
598be24644 Fixed overflow for 8-bit decrementing. 2017-05-25 21:23:38 -04:00
Thomas Harte
c668ff9472 Added incrementing of the refresh register. 2017-05-25 21:01:52 -04:00
Thomas Harte
6575091a78 Fixed Z80's ownership of its fetch-decode-execute program, its habit of scheduling invalidly when hitting an unrecognised operation and the test machine's habit of dereferencing invalidly. 2017-05-22 21:50:34 -04:00
Thomas Harte
9e25d014d2 Made an attempt to log bus activity for comparison with FUSE results. 2017-05-22 19:49:38 -04:00
Thomas Harte
41d5dd8679 Added a memory access delegate to the Z80 all-ram processor, to allow access patterns to be captured. 2017-05-22 19:24:11 -04:00
Thomas Harte
c3ea6dc1f5 Added respect for limiting to the requested number of cycles in the Z80. 2017-05-22 19:15:55 -04:00
Thomas Harte
22afa509ca Got to a parsing and towards an attempt to run FUSE tests. 2017-05-22 19:14:46 -04:00
Thomas Harte
f2aae72cc2 Fixed the 16-bit ADCs and SBCs, added INC (HL) and DEC (HL). Zexall now enters a seemingly-infinite loop. Which is progress, at least. 2017-05-21 20:43:36 -04:00
Thomas Harte
fe8db1873c Added 16-bit ADC and SBC table entries; once again extended logging. 2017-05-21 20:32:06 -04:00
Thomas Harte
c66c715ac9 Starts to try to figure out how to implemented the index register pages, but doesn't yet read offsets. 2017-05-21 19:26:40 -04:00
Thomas Harte
5dcfd85642 Added a compact and copy stage for instruction pages, both [mostly] eliminating the mistake of letting static data structures contain pointers to instance storage and opening the door for addition of the DD and FD pages. 2017-05-21 19:15:52 -04:00
Thomas Harte
c70dfe1b09 Implemented the two variations of loading between (nn) and SP. 2017-05-21 13:20:28 -04:00
Thomas Harte
232c591655 Threw in a little macro documentation and a missing macro. 2017-05-21 13:13:21 -04:00
Thomas Harte
790614b544 Added EI and DI. 2017-05-21 12:53:17 -04:00
Thomas Harte
32c032cd97 Implemented a couple of easy-to-add missing base page instructions. 2017-05-21 10:18:43 -04:00
Thomas Harte
e48ee16366 Continued cleaning efforts, added conditional RET. 2017-05-21 10:13:59 -04:00
Thomas Harte
e92d936ce8 Added conditional calls. 2017-05-21 10:03:46 -04:00
Thomas Harte
4e210c5396 Added LD A, (nn). 2017-05-21 10:00:10 -04:00
Thomas Harte
3d3e60b1fc Implemented LD (HL), r. 2017-05-21 09:56:41 -04:00
Thomas Harte
f3f0e2f1a9 Implemented RRA and RRCA. 2017-05-21 09:52:19 -04:00
Thomas Harte
08206eea56 This logging has outlived its usefulness for now. 2017-05-21 09:47:53 -04:00
Thomas Harte
78296246e8 Added ALU n. 2017-05-21 09:46:18 -04:00
Thomas Harte
85b5dd35b1 Took a shot at 8-bit arithmetic. 2017-05-21 09:43:17 -04:00
Thomas Harte
11cfaa3e3d Performed light syntactic cleaning on the first part of the base page table, eliminated redundant temporary variables, implemented 8-bit increment and decrement. 2017-05-21 09:17:30 -04:00
Thomas Harte
103c863534 Through temporarily dramatically increased logging, fixed conditional JP. 2017-05-20 23:03:52 -04:00
Thomas Harte
6688f83226 Took a shot at LDIR. 2017-05-20 21:58:24 -04:00
Thomas Harte
01a064dd63 Added an empty ED page. 2017-05-20 17:29:30 -04:00
Thomas Harte
7b234078ae Implemented EX DE, HL and shuffled to allow instruction pages. 2017-05-20 17:04:25 -04:00
Thomas Harte
add02a7897 Added LD (nn), A, and reduced double logging to single for now. 2017-05-19 23:13:28 -04:00
Thomas Harte
19167df692 Consolidated and filled in AND and XOR. 2017-05-19 23:03:34 -04:00
Thomas Harte
6766845e21 Filled in most of the loads. 2017-05-19 22:57:43 -04:00
Thomas Harte
bc3b5f3e35 Added 16-bit INCs and DECs. Which don't set flags, so are easy. 2017-05-19 22:13:36 -04:00
Thomas Harte
5fe23113ec Moved RET to the correct place, implemented POP AF. 2017-05-19 22:03:12 -04:00
Thomas Harte
c55e1c1d17 Implemented POP and therefore RET; corrected timing of PUSH. 2017-05-19 21:59:45 -04:00
Thomas Harte
d910405648 Added enough infrastructure to be able to react to the two CP/M calls this cares about. 2017-05-19 21:53:39 -04:00
Thomas Harte
62b432c046 Added the concept of a trap handler to the all-RAM processor and exposed it via the test Z80 classes. 2017-05-19 21:20:28 -04:00
Thomas Harte
eae1f78221 Implemented the main page pushes. 2017-05-19 19:28:38 -04:00
Thomas Harte
11d05fb3b8 Expanded a little on operations, added an implementation or two. 2017-05-19 19:18:35 -04:00
Thomas Harte
58efca835f Sought to add a further opcode. 2017-05-18 22:53:43 -04:00
Thomas Harte
99f2060fc1 Further improved macros. 2017-05-18 22:11:54 -04:00
Thomas Harte
5d3ebcb35a Made a first attempt at LD HL, (nn). 2017-05-17 22:42:30 -04:00
Thomas Harte
509d011fbe Implemented JP, my first Z80 operation. 2017-05-17 22:31:41 -04:00
Thomas Harte
17ffd604bf Made an attempt to get the Z80 at least as far as rejecting an opcode. 2017-05-17 21:45:23 -04:00
Thomas Harte
21d0602305 Restored the all RAM 6502's lack of power-on reset. 2017-05-17 21:43:40 -04:00
Thomas Harte
1378ab7278 Ensured initial program counter and stack pointer are correct for Zexall, fixed the Z80 to use a compile-time polymorphic call for bus access. 2017-05-17 07:36:06 -04:00
Thomas Harte
87a021ec2d Made further attempt to get as fas as having the Z80 attempt to do something. 2017-05-16 22:19:40 -04:00
Thomas Harte
7190f927b7 Factored out the stuff that both all-RAM processors would share, rather than duplicating it. 2017-05-16 21:28:17 -04:00
Thomas Harte
d559d8b901 Continued edging towards getting the absolute basics of a testable Z80, for test-driven development. Corrected old-fashioned instance naming issues with the corresponding 6502 class and removed an unnecessary source file while at it. 2017-05-16 21:19:17 -04:00
Thomas Harte
50bb4f0142 There's finally a loop in here, at least. 2017-05-15 22:25:52 -04:00
Thomas Harte
7da51602d5 Moved flush, added run_for_cycles, which does nothing right now. 2017-05-15 07:59:21 -04:00
Thomas Harte
5152517887 Added the boilerplate stuff necessary to query registers. 2017-05-15 07:55:53 -04:00
Thomas Harte
eb8a2de5d6 Settled definitively on flush as more communicative than synchronise (and slightly more locale neutral); culled some more duplication from the Z80. 2017-05-15 07:38:59 -04:00
Thomas Harte
f2a1a906ff Adapted what negligible amount there is of the z80 as per the new CPU namespace. 2017-05-14 22:15:16 -04:00
Thomas Harte
0808e9b6fb 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. 2017-05-14 22:08:15 -04:00
Thomas Harte
b81a2cc273 First tentative steps towards adding a Z80 implementation. 2017-05-14 17:46:41 -04:00
Thomas Harte
defec2c9b0 Fixed: operation reads now fulfil the promise of seeding the value to be read with 0xff. 2017-03-26 20:56:27 -04:00
Thomas Harte
e01f3f06c8 Completed curly bracket movement. 2017-03-26 14:34:47 -04:00
Thomas Harte
55ce851bb2 Fixed types of the 8k cartridges, ensured the 6502 starts without an IRQ request history. 2017-03-18 17:04:01 -04:00
Thomas Harte
36b58d03b7 Formalised read bus value guarantee from the 6502, fixed missing clock signal wiring on the Atari cartridge class, reintroduced CommaVid support. 2017-03-18 14:46:46 -04:00
Thomas Harte
14a76af0d3 Started trying to float out bus control to cartridges. 2017-03-17 20:28:07 -04:00
Thomas Harte
5be22e2f8d Switched to suffix underscores and underscores in general for instance variables. 2016-12-03 11:38:53 -05:00
Thomas Harte
7ad44f5152 Flipped order of conditional so as negligibly to improve prediction. 2016-10-31 22:17:18 -04:00
Thomas Harte
2452a3104f Corrected test: hitting zero is sufficient. No need to cross it. 2016-10-30 20:24:30 -04:00
Thomas Harte
9309be229c Moved cycle count test down to the only places where it may actually yield a different result. 2016-10-30 20:13:44 -04:00
Thomas Harte
a106018680 Fixed initial state: interrupt flag is initially low. 2016-10-28 21:22:03 -04:00
Thomas Harte
613b5b3f98 Switched to inverse storage of the interrupt flag so as to reduce logical burden when storing IRQ line history. 2016-10-28 20:52:43 -04:00
Thomas Harte
4408c60ef7 This too should continue, not break, since it doesn't schedule a memory access. 2016-10-27 18:32:21 -04:00
Thomas Harte
534b3d085d Improved test reporting, attempted to resolve timing errors just introduced (i.e. to differentiate break/continue where a cycle may or may not be spent). 2016-10-27 08:41:44 -04:00
Thomas Harte
f84b66a5f4 Made an attempt to fix wake-from-WAIT. 2016-10-25 19:06:46 -04:00
Thomas Harte
4b18c76b84 Introduced a bifurcation between break and continue to signify whether a bus access takes place, necessitating a shift in the location of the bus access but allowing the conditional to be dropped. Need to test. 2016-10-25 18:45:53 -04:00
Thomas Harte
c253a4258f Made minor restructuring changes, slightly to reduce number of conditionals per operation and to drop a big hint to the optimiser. 2016-10-25 18:34:24 -04:00
Thomas Harte
fa7c64bb5d Eventually reached an implementation of ADC that continues to satisfy all the formalised unit tests while also satisfying the manual BCDTest, that I need to find a way to formalise. I fixed the unit tests for Swift 3 while here, and attempted to do some unrelated NIB stuff with no real success. 2016-10-03 22:03:39 -04:00
Thomas Harte
5d40d70c92 Fixed 6560 addressing error, added an autotyper for Vic disks (more work potentially needed), fixed semantics for testing whether a 6502 is about to reset. 2016-08-01 10:32:32 -04:00
Thomas Harte
740ea0b7e2 Added overflow-flag setting logic and ensured disk ROM gets through regardless of ROM/disk installation order. 2016-07-31 19:33:18 -04:00
Thomas Harte
1baf21827c Since the ROM is well disassembled, let's actually try to be a 1541 first. 2016-07-06 22:17:32 -04:00
Thomas Harte
41809d4597 Made an attempt at NMI usurption of IRQ/BRK. 2016-06-29 20:59:45 -04:00
Thomas Harte
c02226bc41 Ensured stack pointer goes the right way upon reset. 2016-06-29 20:42:26 -04:00
Thomas Harte
db7c6430b5 Fixed Klaus Dormann termination condition. 2016-06-29 19:16:34 -04:00
Thomas Harte
0182b0483a Added a 'power on' flag that is set automatically at construction but can be declined. Saves all that stuff of every machine having to set and then unset the RST line, and fixes an Electron bug related to that. 2016-06-29 19:13:24 -04:00
Thomas Harte
6419d9c485 Added a single IRQ test case, discovering that I'm two cycles short. Whoops! 2016-06-28 21:29:43 -04:00
Thomas Harte
6e698e908e Made an attempt to reduce cost of the most-likely path. 2016-06-28 18:46:00 -04:00
Thomas Harte
574aa32b72 Made an attempt to implement NMI. Some work to do on the B flag though, I think. 2016-06-27 22:01:48 -04:00
Thomas Harte
88e2b382e5 Made an attempt at a full and thorough 6532 implementation (and got a bit more explicit about flag size in the 6502). 2016-06-20 18:57:35 -04:00
Thomas Harte
ef3ed1f436 Implemented full paste ability for any machine that is a typer. 2016-06-19 16:35:04 -04:00
Thomas Harte
06fb2ff1c7 Started endeavouring to sketch out the boilerplate for writing a 6522 test harness. Added a default implementation of synchronise to the 6522 too, since not everybody is going to want one. 2016-06-18 09:28:46 -04:00
Thomas Harte
5c4f35e13f Finally started on generalising the C++ stuff so as to be able to be able to get a working audio binding on the OS-specific side without further repetition by factoring an appropriate protocol out from the Electron and sketching out the correct speaker class for the Atari. Added a method to ask it what a good output frequency would be. 2016-05-31 21:23:44 -04:00
Thomas Harte
0242924fb4 Various bits of caveman debugging appearing and disappearing, switched to latching ball behaviour. 2016-05-22 14:26:02 -04:00
Thomas Harte
e636ae37b4 Ensured that calling return_from_subroutine really does unjam the processor if required, causing all tests once again to pass. 2016-05-10 21:44:11 -04:00
Thomas Harte
5a4262d74e Confirmed: it is inaccurate for a 6502 to self reset at power up. So that responsibility now rests in the machines. 2016-05-10 21:05:52 -04:00
Thomas Harte
9b64f64db7 Attempted to normalise some style decisions.` 2016-04-24 22:32:24 -04:00
Thomas Harte
a6ef78862c This'll probably do for now. 2016-03-24 22:20:00 -04:00
Thomas Harte
f1caf62ff2 Continuing the switch around. 2016-03-24 19:31:41 -04:00
Thomas Harte
738186e323 Edging back towards shifting things to the stack. 2016-03-24 19:17:44 -04:00
Thomas Harte
3038704977 Attempted to introduce a lowpass filter to the graphics output, reverted 6502 optimisations as seemingly not working. 2016-03-21 22:01:25 -04:00
Thomas Harte
5db0f9e2d5 Shunted a few more things onto the stack. 2016-03-20 22:59:21 -04:00
Thomas Harte
9a82f028aa operation is now also stack local. 2016-03-20 22:52:49 -04:00
Thomas Harte
2f174b3a3e Moved operand to stack-local storage. 2016-03-20 22:50:16 -04:00
Thomas Harte
5966ac845f Switched symbols and updated all-RAM 6502 in order to fix unit test target. 2016-03-20 22:48:56 -04:00
Thomas Harte
a4ec0b023c Made some type conversions explicit. 2016-03-15 21:25:02 -04:00
Thomas Harte
20ac630e4d Some minor optimisations and timing tweaks. Nothing of substance. 2016-03-10 19:58:50 -05:00
Thomas Harte
1eea28b692 Disabled some debugging parts, added some others, marked some things as inline. Ticking over. 2016-02-22 23:35:42 -05:00
Thomas Harte
baef1ccd57 Made the constructor protected, to emphasise that this class isn't for instantiation. Also added extra comments aplenty. 2016-01-21 08:39:34 -05:00
Thomas Harte
9fa35dd559 Killed some whitespace lines. 2016-01-20 21:58:34 -05:00
Thomas Harte
de7218cdf0 Added a lot of commenting to the CPU6502 definition, simplifying its construction. Added missing nullability modifier to CSElectron. Fixed bad-habit Objective-C style naming on the Electron's Interrupt enum. 2016-01-20 21:55:38 -05:00
Thomas Harte
93f7df04a0 Ensured correctly timed sampling of the interrupt line. 2016-01-10 22:55:56 -05:00
Thomas Harte
ccf20299a3 Made an attempt at getting some interrupts all up inside this thing. 2016-01-10 19:06:46 -05:00
Thomas Harte
7341f5c341 This is intended to be enough to start producing something of an output. But something's obviously still broken. 2016-01-09 20:26:40 -05:00
Thomas Harte
bfd9957c81 You now get an Electron only if you ask for a new file. That'll do for now while it's the only thing that one might want to start without supplying a file. The 6502 now starts from a defined point — being reset. The Electron is starting to grow the absolute most simple buds of its memory map. 2016-01-06 21:09:49 -05:00
Thomas Harte
675070c5dd Very, _very_ minor: switched to normal C++ constructor syntax for simple variable initialisation. 2015-12-06 16:53:37 -05:00
Thomas Harte
a693c081f8 Switched on the appropriate compiler warnings re: signed comparisons and implicit conversions. Fixed all less-than-explicit calls. 2015-08-16 16:08:29 -04:00
Thomas Harte
9ca57b80a7 Minor steps to help with diagnostics; all commented out or merely to benefit with breakpoint placement. 2015-08-13 08:43:10 +01:00
Thomas Harte
cc98534f94 Added test for NOP, discovering the undocumented ones to be the incorrect length. 2015-08-13 07:32:50 +01:00
Thomas Harte
dd0f17130a Found and fixed some timing errors in absolute indexed and in (indirect), y addressing modes: neither is able in write or read-modify-write modes to shave a cycle as then can when reading. 2015-08-13 02:58:39 +01:00
Thomas Harte
975836c30f Added a quick snippet test, discovering that I've cut a cycle from read/modify/writes. 2015-08-13 02:18:41 +01:00
Thomas Harte
503d684af0 Added a couple of timing tests, both of which seem to pass for now. 2015-08-13 01:55:23 +01:00
Thomas Harte
d19f8ed507 Removed the implicit reset upon 6502 startup, adding a reset line. Hence all tests now pass again. Added an empty shell for timing tests, the all-RAM 6502 now counting bus cycles. 2015-08-13 00:51:06 +01:00
Thomas Harte
c1d1fb65cb Made an attempt properly to emulate the RDY line and the Atari's use of it. 2015-07-31 16:54:20 -04:00
Thomas Harte
53dd5c8f16 Trying to fix my RDY line emulation. Switched to PAL timings, at least temporarily, since it's starting to make a difference. 2015-07-31 16:44:53 -04:00
Thomas Harte
cd0a62d21e With a slight tweak to the informal protocol used for 6502 memory access cycles, ensured the wait strobe actually halts the CPU, to give a more accurate linking of machine time to real time. 2015-07-26 15:55:19 -04:00
Thomas Harte
6252f6030f Switched to idiomatic source name, ensured latest project name is in all appropriate header places, threw texture coordinates slightly into the shader mix. 2015-07-26 15:25:11 -04:00
Thomas Harte
6558ae1425 Imported what little I have so far in the way of a memory-access cycle complete 6502 and just enough of a pretend Atari 2600 on top to be able to see some playfields in ASCII art. 2015-07-16 19:56:02 -04:00