Thomas Harte
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3b398f7a9a
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Attempts to complete all 65816 bus signalling.
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2020-10-16 21:56:20 -04:00 |
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Thomas Harte
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096add7551
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Exposes non-BusOperation bus outputs.
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2020-10-16 21:05:42 -04:00 |
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Thomas Harte
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68c15bd605
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Updates Qt project; catches another couple of issues via its compiler.
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2020-10-15 21:09:22 -04:00 |
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Thomas Harte
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c0a1c34012
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Wraps all registers into a struct, so that I can implement abort.
Makes some preparations for ready too.
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2020-10-15 18:42:38 -04:00 |
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Thomas Harte
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3c6adc1ff4
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Completes 65816 addressing mode tests and corresponding fixes.
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2020-10-14 22:00:52 -04:00 |
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Thomas Harte
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27afb8f0a7
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Adds direct indirect long test, and thereby fixes addressing mode.
Nine to go!
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2020-10-14 21:26:20 -04:00 |
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Thomas Harte
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b22aa5d699
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Starts transcribing the addressing examples I have into tests.
Correspondingly extends the exposed register set and test-machine addressing range.
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2020-10-13 21:38:30 -04:00 |
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Thomas Harte
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8f5537aaaa
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Attempts to resolve my direct-indirect addressing stumble.
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2020-10-13 20:21:53 -04:00 |
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Thomas Harte
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a15d4a156b
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Starts trying to ensure appropriate address wrapping.
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2020-10-12 22:33:43 -04:00 |
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Thomas Harte
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f529eadbec
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Corrects 16-bit read-modify-write.
Subject to the TODO proviso on 'correct'; has my 6502 prejudice pushed me into unrealistic bus signalling?
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2020-10-12 18:36:09 -04:00 |
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Thomas Harte
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5dc3cd3a2f
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Starts using Jeek816 for a basic native-mode audit. Fixes absolute long addressing.
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2020-10-11 22:02:46 -04:00 |
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Thomas Harte
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82797fd395
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Attempts to do the proper thing for interrupts.
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2020-10-11 21:10:44 -04:00 |
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Thomas Harte
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a0885ab7d0
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Implements STP and WAI.
Albeit still without fully-implemented reactions to exceptions in general.
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2020-10-11 17:56:55 -04:00 |
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Thomas Harte
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8eaf1303a3
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Attempts proactively to ensure proper RTI behaviour on the 65816.
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2020-10-11 15:25:13 -04:00 |
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Thomas Harte
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071ad6b767
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I don't think RTL is needed; JML looks like it covers it.
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2020-10-10 22:16:35 -04:00 |
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Thomas Harte
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ae87728770
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Ensures M and X are exposed to the public interface.
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2020-10-10 21:33:56 -04:00 |
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Thomas Harte
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28c8ba70c1
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Implements REP and SEP and exposes the MX flags generally.
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2020-10-10 21:23:59 -04:00 |
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Thomas Harte
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451f83ba51
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Corrects emulation-mode read-modify-writes not to empty the data buffer.
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2020-10-09 22:14:42 -04:00 |
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Thomas Harte
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0ed98cbfac
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Attempts to fix direct indirect indexed; not yet successful I think.
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2020-10-08 22:15:19 -04:00 |
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Thomas Harte
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7dde7cc743
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Implements altered direct indexed addressing in emulation mode.
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2020-10-08 22:02:14 -04:00 |
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Thomas Harte
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0418f51ef2
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Takes a shot at emulation-mode 'exceptions'.
It's just RTI and correct decimal SBC left of the official 6502s now, I think.
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2020-10-08 17:52:13 -04:00 |
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Thomas Harte
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054e0af071
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Corrects RTS behaviour: the return address on the stack is off by one.
Dormann's tests now proceed to a BRK.
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2020-10-08 16:55:45 -04:00 |
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Thomas Harte
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907c3374c3
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Attempts to clean up my JMP/JSR mess.
Also takes a step forwards in decimal SBC, but it's not right yet.
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2020-10-08 16:48:46 -04:00 |
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Thomas Harte
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b608e11965
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Realises that not all non-incrementing PC fetches should be thrown away.
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2020-10-07 20:06:27 -04:00 |
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Thomas Harte
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7439a326a6
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Implements BIT (in regular and immediate forms).
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2020-10-07 18:15:18 -04:00 |
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Thomas Harte
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7065ba4857
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Implements the single-byte branches.
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2020-10-06 21:24:43 -04:00 |
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Thomas Harte
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9ce9167e3c
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Formalises work left to do.
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2020-10-06 19:12:19 -04:00 |
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Thomas Harte
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993eff1d3d
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Starts slowly, with flag manipulation.
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2020-10-06 16:25:30 -04:00 |
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Thomas Harte
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b7ba0d4327
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Attempts to complete all addressing modes.
So, if bugs didn't exist, it'd just be members of the Operation enum to go.
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2020-10-05 17:04:57 -04:00 |
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Thomas Harte
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d8dccf2500
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Attempts a full implementation of MVN and MVP.
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2020-10-04 19:21:04 -04:00 |
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Thomas Harte
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4ebf594b3b
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This should bring me up to absolute, y.
i.e. next is datasheet program 7.
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2020-10-04 19:02:47 -04:00 |
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Thomas Harte
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8a83024962
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Starts a dash towards just completing the addressing modes for now.
This brings me up to the end of absolute long (i.e. 4a on the datasheet).
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2020-10-04 18:52:46 -04:00 |
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Thomas Harte
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bdc1136b96
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Edges towards working short absolute addressing mode.
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2020-10-03 21:30:24 -04:00 |
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Thomas Harte
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b83d93abc2
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Accepts that whether instructions do 8- or 16-bit bus accesses depends on either M or X depending on the operation.
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2020-10-02 17:08:30 -04:00 |
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Thomas Harte
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78b3ec4b10
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The actual work begins: starts implementing 65816 micro-ops.
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2020-09-29 18:42:07 -04:00 |
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Thomas Harte
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ef1a514785
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Introduces 6502Selector, for picking either a 6502 or a 65816 based on a single template parameter.
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2020-09-28 21:35:46 -04:00 |
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Thomas Harte
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6635876e7e
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Performs a bare factoring out of the 6502 bus handler.
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2020-09-28 18:43:53 -04:00 |
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Thomas Harte
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5645f90abe
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Takes a minor first step towards actually performing 65816 instructions.
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2020-09-27 22:20:58 -04:00 |
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Thomas Harte
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1cd664ad85
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Adds a sanity check.
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2020-09-26 21:43:26 -04:00 |
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Thomas Harte
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e680022b1f
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Completes the opcode set.
A million bugs yet to find.
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2020-09-26 21:35:31 -04:00 |
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Thomas Harte
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67c2ce2174
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Takes a run at completing the stack section.
I'm not really sure about BRK though — does it gain a signature on the 65816?
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2020-09-26 21:20:01 -04:00 |
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Thomas Harte
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596e700b60
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Drags myself onto the final page of bus programs.
233 opcodes now complete; six bus programs to go.
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2020-09-26 20:57:24 -04:00 |
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Thomas Harte
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4a53b6e538
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Adds push and pull, reaching 229/256 opcodes.
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2020-09-26 20:38:29 -04:00 |
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Thomas Harte
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687f4bb3bb
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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.
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2020-09-26 20:24:50 -04:00 |
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Thomas Harte
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473799cb62
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There's not a lot to STP and WAI from a bus program point of view.
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2020-09-26 20:18:30 -04:00 |
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Thomas Harte
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3dc22a9fd5
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Adds implied and immediate modes.
... for 204/256 opcodes covered.
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2020-09-26 17:42:42 -04:00 |
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Thomas Harte
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f54b655606
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Adds d, x and d, y.
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2020-09-26 17:26:17 -04:00 |
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Thomas Harte
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d2e868ea2b
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Adds (d), y; [d], y; and [d].
Now covered: 146/256 opcodes, 4/7 pages, 25/47 bus programs.
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2020-09-26 16:55:58 -04:00 |
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Thomas Harte
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1512ac11da
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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?
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2020-09-25 22:22:30 -04:00 |
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Thomas Harte
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5039cc7bb2
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Adds direct page.
... to cover 106 opcodes.
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2020-09-25 22:01:36 -04:00 |
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