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6,855 Commits 9 Branches 118 Tags 496 MiB
a15d4a156b
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61 Commits

Author SHA1 Message Date
Thomas Harte
a15d4a156b Starts trying to ensure appropriate address wrapping. 2020-10-12 22:33:43 -04:00
Thomas Harte
7479dc74ed Removes printf. It's no longer telling me anything. 2020-10-12 21:52:58 -04:00
Thomas Harte
28da1a724a Introduces Jeek816 test case. 2020-10-12 21:43:44 -04:00
Thomas Harte
f529eadbec Corrects 16-bit read-modify-write. 
Subject to the TODO proviso on 'correct'; has my 6502 prejudice pushed me into unrealistic bus signalling?
 2020-10-12 18:36:09 -04:00
Thomas Harte
5dc3cd3a2f Starts using Jeek816 for a basic native-mode audit. Fixes absolute long addressing. 2020-10-11 22:02:46 -04:00
Thomas Harte
a0885ab7d0 Implements STP and WAI. 
Albeit still without fully-implemented reactions to exceptions in general.
 2020-10-11 17:56:55 -04:00
Thomas Harte
8eaf1303a3 Attempts proactively to ensure proper RTI behaviour on the 65816. 2020-10-11 15:25:13 -04:00
Thomas Harte
20cbe72985 Ties to 8- or 16-bit those instructions that aren't M/X-dependent. 
This is technically redundant for PEI, PEA and PER since they have dedicated bus programs anyway, but it's good to be explicit.
 2020-10-11 14:38:35 -04:00
Thomas Harte
b8848d8580 Implements TCD, TDC, TCS, TSC. 2020-10-10 21:43:05 -04:00
Thomas Harte
ae87728770 Ensures M and X are exposed to the public interface. 2020-10-10 21:33:56 -04:00
Thomas Harte
28c8ba70c1 Implements REP and SEP and exposes the MX flags generally. 2020-10-10 21:23:59 -04:00
Thomas Harte
6892ac13e8 Corrects BIT. All 65816-applicable Wolfgang Lorenz tests now pass. 2020-10-10 17:47:33 -04:00
Thomas Harte
d17c90edf7 Corrects ROL d, x. 2020-10-10 11:25:14 -04:00
Thomas Harte
7966592fae Corrects ROL d. 2020-10-10 11:22:23 -04:00
Thomas Harte
92e72959c3 Makes corrections to ix addressing mode and shift/roll flags. 2020-10-09 23:12:20 -04:00
Thomas Harte
451f83ba51 Corrects emulation-mode read-modify-writes not to empty the data buffer. 2020-10-09 22:14:42 -04:00
Thomas Harte
0ed98cbfac Attempts to fix direct indirect indexed; not yet successful I think. 2020-10-08 22:15:19 -04:00
Thomas Harte
7dde7cc743 Implements altered direct indexed addressing in emulation mode. 2020-10-08 22:02:14 -04:00
Thomas Harte
f8004d7096 Implements RTI, corrects TAY. 2020-10-08 18:06:11 -04:00
Thomas Harte
0418f51ef2 Takes a shot at emulation-mode 'exceptions'. 
It's just RTI and correct decimal SBC left of the official 6502s now, I think.
 2020-10-08 17:52:13 -04:00
Thomas Harte
054e0af071 Corrects RTS behaviour: the return address on the stack is off by one. 
Dormann's tests now proceed to a BRK.
 2020-10-08 16:55:45 -04:00
Thomas Harte
907c3374c3 Attempts to clean up my JMP/JSR mess. 
Also takes a step forwards in decimal SBC, but it's not right yet.
 2020-10-08 16:48:46 -04:00
Thomas Harte
b608e11965 Realises that not all non-incrementing PC fetches should be thrown away. 2020-10-07 20:06:27 -04:00
Thomas Harte
e68b3a2f32 Corrects JMP program. 2020-10-07 19:59:29 -04:00
Thomas Harte
a4cec95db1 Corrects load and transfer flag oversights. 2020-10-07 19:36:23 -04:00
Thomas Harte
84c4fa197b Corrects DEX mapping, notes new Dormann failure case. 2020-10-07 18:48:03 -04:00
Thomas Harte
7439a326a6 Implements BIT (in regular and immediate forms). 2020-10-07 18:15:18 -04:00
Thomas Harte
7065ba4857 Implements the single-byte branches. 2020-10-06 21:24:43 -04:00
Thomas Harte
b7ba0d4327 Attempts to complete all addressing modes. 
So, if bugs didn't exist, it'd just be members of the Operation enum to go.
 2020-10-05 17:04:57 -04:00
Thomas Harte
b83d93abc2 Accepts that whether instructions do 8- or 16-bit bus accesses depends on either M or X depending on the operation. 2020-10-02 17:08:30 -04:00
Thomas Harte
36f843bc6e Ensure std::function is visible to 65816Storage.cpp. 2020-09-29 19:23:38 -04:00
Thomas Harte
78b3ec4b10 The actual work begins: starts implementing 65816 micro-ops. 2020-09-29 18:42:07 -04:00
Thomas Harte
5645f90abe Takes a minor first step towards actually performing 65816 instructions. 2020-09-27 22:20:58 -04:00
Thomas Harte
5449e90b34 Edges towards offering the 65816 as another type of 6502 for testing. 2020-09-26 22:31:50 -04:00
Thomas Harte
1cd664ad85 Adds a sanity check. 2020-09-26 21:43:26 -04:00
Thomas Harte
e680022b1f Completes the opcode set. 
A million bugs yet to find.
 2020-09-26 21:35:31 -04:00
Thomas Harte
67c2ce2174 Takes a run at completing the stack section. 
I'm not really sure about BRK though — does it gain a signature on the 65816?
 2020-09-26 21:20:01 -04:00
Thomas Harte
596e700b60 Drags myself onto the final page of bus programs. 
233 opcodes now complete; six bus programs to go.
 2020-09-26 20:57:24 -04:00
Thomas Harte
4a53b6e538 Adds push and pull, reaching 229/256 opcodes. 2020-09-26 20:38:29 -04:00
Thomas Harte
687f4bb3bb Adds relative and relative long bus patterns. 
Many of the rest cover only one or two opcodes so this puts me at 216/256 opcodes covered; 35/47 bus programs; just more than 5/7 pages.
 2020-09-26 20:24:50 -04:00
Thomas Harte
473799cb62 There's not a lot to STP and WAI from a bus program point of view. 2020-09-26 20:18:30 -04:00
Thomas Harte
3dc22a9fd5 Adds implied and immediate modes. 
... for 204/256 opcodes covered.
 2020-09-26 17:42:42 -04:00
Thomas Harte
f54b655606 Adds d, x and d, y. 2020-09-26 17:26:17 -04:00
Thomas Harte
d2e868ea2b Adds (d), y; [d], y; and [d]. 
Now covered: 146/256 opcodes, 4/7 pages, 25/47 bus programs.
 2020-09-26 16:55:58 -04:00
Thomas Harte
3fc649359a Transcribes the titles of all remaining bus programs. 
Thereby frames the distance yet to travel.
 2020-09-25 22:29:19 -04:00
Thomas Harte
1512ac11da Adds (d, x) and (d) modes. Albeit by deferring the hard work. 
That's: 122/256 opcodes; 22/47 bus programs, ~3.5/7 pages transcribed. Maybe I'll be able to get to the runtime stuff sooner rather than later?
 2020-09-25 22:22:30 -04:00
Thomas Harte
5039cc7bb2 Adds direct page. 
... to cover 106 opcodes.
 2020-09-25 22:01:36 -04:00
Thomas Harte
5360a7b4ce Adds block moves. 
These are fairly specialised, dealing in two data addresses simultaneously.
 2020-09-25 21:49:03 -04:00
Thomas Harte
2957a31f40 Adds absolute, x; absolute,y; and accumulator addressing modes. 
Now covered: 80/256 opcodes, from 2/6 pages of the data sheet; or 16/47 bus programs.
 2020-09-25 21:16:36 -04:00
Thomas Harte
8c11df52bf Adds absolute long, x. 
Factors out the commonality of a closing read/write while I'm here.
 2020-09-25 19:27:17 -04:00