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9,363 Commits 9 Branches 118 Tags 495 MiB
66775b2c4e
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1154 Commits

Author SHA1 Message Date
Thomas Harte
66775b2c4e Always consume a second cycle in 16-bit mode. 2022-06-23 12:46:51 -04:00
Thomas Harte
2c12a7d968 Make absolutely sure there's no address bit 24. 2022-06-23 12:12:02 -04:00
Thomas Harte
5a97c09238 Flip internal presumption on the BRK flag. 2022-06-23 11:23:00 -04:00
Thomas Harte
3112376943 Don't include DBR in direct indexed indirect. 2022-06-23 11:03:37 -04:00
Thomas Harte
ecfd17a259 Report a 1 in the stack pointer high byte when in emulation mode. 
It has one internally, it just wasn't previously exposed via this method.
 2022-06-22 15:55:34 -04:00
Thomas Harte
a72dd96dc6 Page boundary crossing is free outside of emulation mode. 2022-06-22 15:31:30 -04:00
Thomas Harte
944e5ebbfa Take another run at IO addresses. 2022-06-22 15:28:11 -04:00
Thomas Harte
76767110b7 Fix overflow for 8-bit calculations; essentially a revert for ADC. 2022-06-22 15:18:47 -04:00
Thomas Harte
7dcfa9eb65 65816: improve decimal calculations, posted IO addresses, read/write during redundant read-modify-write cycle. 2022-06-21 14:33:06 -04:00
Thomas Harte
ec98736bd7 Ensure IO cycles don't produce an address of (PC+1). 2022-06-21 11:41:05 -04:00
Thomas Harte
586ef4810b Add restart_operation_fetch, to aid with testing. 2022-06-18 16:25:57 -04:00
Thomas Harte
a0bc332fe6 Taking a second parse, prefer non-lookup-table solutions. 2022-06-17 11:55:38 -04:00
Thomas Harte
b0ab5b7b62 Simplify Microcycle helpers. 2022-06-16 21:34:24 -04:00
Thomas Harte
dc8103ea82 Fix return address following a STOP. 2022-06-16 15:10:35 -04:00
Thomas Harte
7d00b50e13 Fix upper/lower_data_select; simplify value8_low. 2022-06-15 21:11:31 -04:00
Thomas Harte
12b058867e Correct very minor typo. 2022-06-15 19:34:54 -04:00
Thomas Harte
8ff09a1923 Fix value8_high. 2022-06-15 19:34:49 -04:00
Thomas Harte
62fa0991ed Disallow copying, add some basic asserts. 2022-06-15 19:34:43 -04:00
Thomas Harte
24823233ff Add spurious interrupt support. 2022-06-15 11:00:27 -04:00
Thomas Harte
bd056973ba Don't allow STOP state to block execution. 2022-06-15 10:56:45 -04:00
Thomas Harte
5420fd5aa3 Fix: new status word is still in prefetch. 2022-06-15 10:54:34 -04:00
Thomas Harte
93615f6647 Apply new status before entering STOP loop. 2022-06-15 10:50:03 -04:00
Thomas Harte
0ace9634ce Fix MOVEA. 2022-06-14 21:56:48 -04:00
Thomas Harte
48d51759cd At huge copy-and-paste cost, fix MOVE.l. 2022-06-14 21:22:28 -04:00
Thomas Harte
bfd0b683bf Extend MOVE.b fix to cover MOVE.w. 2022-06-14 17:04:11 -04:00
Thomas Harte
61e0f60e94 Add specialised MOVE.b to correct bus sequencing. 
This is a bit of a trial balloon; .w and .l to come.
 2022-06-13 21:49:00 -04:00
Thomas Harte
7fa715e37a Provide more thorough documentation. 2022-06-13 15:27:23 -04:00
Thomas Harte
e066546c13 Resolve PEA timing errors. 2022-06-13 14:08:42 -04:00
Thomas Harte
4a75691005 Avoid double conditional for CalcEffectiveAddressIdleFor8bitDisplacementAndPreDec. 2022-06-13 10:27:22 -04:00
Thomas Harte
8ada73b283 Use the outer switch for addressing mode dispatch, saving a lot of syntax. 2022-06-13 08:57:49 -04:00
Thomas Harte
2a9a05785c Bus and address error don't affect interrupt level. 2022-06-11 21:10:24 -04:00
Thomas Harte
c3345dd839 Fix MOVEM timing. 2022-06-10 21:52:07 -04:00
Thomas Harte
aec4bf9d45 Correct TAS timing. 2022-06-10 15:57:35 -04:00
Thomas Harte
f8643a62e6 Change RTE and RTR read order. 2022-06-09 21:47:28 -04:00
Thomas Harte
64053d697f Take improved guess at address error stacking order. 2022-06-09 16:17:09 -04:00
Thomas Harte
da8e6737c6 Fix standard exception stack write order. 2022-06-08 16:15:11 -04:00
Thomas Harte
670201fcc2 Reset time debt upon 'reset'. 2022-06-08 16:03:16 -04:00
Thomas Harte
ab35016aae Clear any time debt upon phoney reset. 2022-06-08 15:12:32 -04:00
Thomas Harte
6efb9b24e0 Ensure that a phoney reset gets the proper vector. 2022-06-08 14:44:15 -04:00
Thomas Harte
079c3fd263 Abort address error-causing exceptions before they begin. 2022-06-08 14:43:31 -04:00
Thomas Harte
8cbf929671 Don't duplicate work that the RESET program already does. 2022-06-08 11:42:56 -04:00
Thomas Harte
9009645cea Add 'reset' functions. 2022-06-07 16:55:39 -04:00
Thomas Harte
a4baa33e2f Ensure RTE triggers a stack pointer change if needed. 2022-06-06 16:08:50 -04:00
Thomas Harte
cfafbfd141 Fix interrupt acknowledge cycle: signals and data size. 2022-06-04 21:23:57 -04:00
Thomas Harte
542126194a Capture interrupt input at the end of an access cycle, not the beginning. 
All still a guess.
 2022-06-03 15:39:53 -04:00
Thomas Harte
02b6ea6c46 Factor out would-accept-interrupt test, per uncertainty re: level 7. 2022-06-03 08:31:56 -04:00
Thomas Harte
6fcaf3571e Fix bus/address error exception frame: order and contents. 2022-06-03 08:27:49 -04:00
Thomas Harte
f8e933438e Add missing tail cost. 2022-06-02 12:26:25 -04:00
Thomas Harte
2bd20446bb Merge branch '68000Mk2' of github.com:TomHarte/CLK into 68000Mk2 2022-06-02 05:39:32 -04:00
Thomas Harte
659e4f6987 Include fixed cost of rolls. Which includes providing slightly more information to did_shift. 2022-06-01 20:30:51 -04:00