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Commit Graph

316 Commits

Author SHA1 Message Date
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
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
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
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