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10,401 Commits 8 Branches 121 Tags 496 MiB
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190 Commits

Author SHA1 Message Date
Thomas Harte
7815d18676 Merge branch 'master' into 65816StackAgain 2023-08-19 15:55:45 -04:00
Thomas Harte
c41ed191dc Fix S top byte overwrite. 2023-08-17 14:51:13 -04:00
Thomas Harte
42024c1573 Don't allow setting of an invalid S. 2023-08-07 09:19:20 -04:00
Thomas Harte
54103f1f34 Fix SH=1 reset; appropriate TCS. 2023-08-05 15:06:18 -04:00
Thomas Harte
c0eb401d04 Add a between-instructions enforcement of SH = 1. 2023-08-05 14:57:43 -04:00
Thomas Harte
2262725010 Reveal 16-bit stack pointer when asked, regardless of mode. 2023-07-31 17:08:02 -04:00
Thomas Harte
e61a4eb5a9 Regularise PHD and PLD. 2023-07-30 16:36:29 -04:00
Thomas Harte
acd7f9f4cd Fix stack usage of JSL. 2023-07-30 16:34:42 -04:00
Thomas Harte
9f1a657cc4 Fix stack usage of PEA. 2023-07-30 16:33:44 -04:00
Thomas Harte
e52d1866ab Fix PEI stack usage. 2023-07-30 16:32:56 -04:00
Thomas Harte
a02b8222fa Fix stack usage of PER. 2023-07-30 16:29:56 -04:00
Thomas Harte
3762ee1a63 Fix stack usage of PHD. 2023-07-30 16:29:15 -04:00
Thomas Harte
3ec61e8770 Fix stack usage of RTL. 2023-07-30 16:27:13 -04:00
Thomas Harte
2f7dd0b01a Correct stack behaviour of PLD. 2023-07-30 16:26:29 -04:00
Thomas Harte
3a02c22072 Provide an always-16bit-address route to the stack. 2023-07-30 16:25:51 -04:00
Thomas Harte
0f1468adfd Correct wrapping behaviour for (d, x). 2023-07-28 13:39:21 -04:00
Thomas Harte
e9347168e6 Don't alter the data bank upon BRK, COP, IRQ, etc. 2023-07-28 10:53:02 -04:00
Thomas Harte
28c79b2885 Eliminate redundant [space][tab] pairs. 2023-05-12 14:14:45 -04:00
Thomas Harte
f6acee18cc Eliminate type-in-function-name from 6502-world. 2023-05-10 18:53:38 -05:00
Thomas Harte
ed2d4ebb0c Fix test (and commentary) for shortened emulated branches. 2023-04-15 23:30:30 -04:00
Thomas Harte
107cb18df4 Fix perceives S in emulated stack-relative mode. 2023-04-14 00:04:44 -04:00
Thomas Harte
98d3da62b5 Apply E mode wrap for d,x and d,y only when DL = 0. 2022-09-09 16:02:35 -04:00
Thomas Harte
45dc99fb9d Further improve exposition. 2022-09-09 15:48:25 -04:00
Thomas Harte
4ddbf095f3 Fully banish flush from the processors. 2022-07-12 10:49:53 -04:00
Thomas Harte
c2938a4f63 Avoid potential classic macro error with address. 2022-06-29 15:09:52 -04:00
Thomas Harte
4467eb1c41 Ensure relevant throwaway stack reads use the previous stack address. 
TODO: can CycleFetchPreviousThrowaway be used more widely?
 2022-06-24 14:00:03 -04:00
Thomas Harte
069a057a94 Resolve assumption of arithmetic shifts. 2022-06-24 07:26:07 -04:00
Thomas Harte
4ed3b21bf3 Decimal SBC tweak: negative partial results don't cause carry. 2022-06-23 21:58:09 -04:00
Thomas Harte
a23b0f5122 Map STA (d), y to correct calculator. 2022-06-23 20:57:47 -04:00
Thomas Harte
da552abf75 Fix BIT overflow flag. 2022-06-23 15:24:51 -04:00
Thomas Harte
380b5141fb Be overt about conversion wanted here. 2022-06-23 13:03:26 -04:00
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
c8471eb993 Adds various asserts, some comments. 2021-03-03 20:47:45 -05:00
Thomas Harte
83d0cfc24e Improves commentary. 2021-03-03 20:33:28 -05:00
Thomas Harte
f6466fd657 Remove temporary hackery. 2021-02-19 22:47:50 -05:00
Thomas Harte
72d7901c88 Takes a shot at the keyboard data full flag. 
Just a guess. But likely?
 2021-02-19 20:06:12 -05:00
Thomas Harte
992ee6d631 Don't zero out the program bank until after it has headed stackward. 2021-02-17 22:08:08 -05:00
Thomas Harte
3c887aff95 Improves consistency. 2021-01-21 18:58:22 -05:00
Thomas Harte
e0b36c9c3d Corrects PBR/DBR resetting upon an exception. 2020-12-29 15:27:49 -05:00
Thomas Harte
574a37814c Attempts to fix exception selection and timing. 2020-12-08 18:46:30 -05:00