diff options
Diffstat (limited to 'opcodes.asm')
| -rw-r--r-- | opcodes.asm | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/opcodes.asm b/opcodes.asm index 7568c49..b96af7b 100644 --- a/opcodes.asm +++ b/opcodes.asm @@ -415,7 +415,7 @@ emu_op_18: FETCHBI d1 move.l epc,a0 bsr underef - add.w d1,d0 ; ??? Can I avoid underef/deref cycle? + add.w d0,d1 ; ??? Can I avoid underef/deref cycle? bsr deref move.l a0,epc DONE ;nok @@ -479,7 +479,8 @@ emu_op_20: ;; PC <- PC+immed.b ;; No flags bsr f_norm_z - bne emu_op_18 ; branch taken: zero clear + ;; if the emulated Z flag is set, this will be clear + beq emu_op_18 ; branch taken: Z reset -> eq (zero set) add.l #1,epc DONE ;nok @@ -674,10 +675,10 @@ emu_op_37: ;; SCF ;; Set Carry Flag ;; XXX flags are more complicated than this :( - move.b #%00111011,flag_valid-flag_storage(a3) + ori.b #%00111011,flag_valid-flag_storage(a3) move.b eaf,d1 ori.b #%00000001,d1 - andi.b #%00101001,d1 + andi.b #%11101101,d1 or.b d1,flag_byte-flag_storage(a3) DONE ;nok @@ -1734,7 +1735,7 @@ F_CP_B MACRO START emu_op_b8: ;; CP B - move.b ebc,d2 + move.w ebc,d2 LOHI d2 F_CP_B d2,eaf DONE ;nok @@ -1748,7 +1749,7 @@ emu_op_b9: START emu_op_ba: ;; CP D - move.b ede,d2 + move.w ede,d2 LOHI d2 F_CP_B d2,eaf DONE ;nok @@ -1762,7 +1763,7 @@ emu_op_bb: START emu_op_bc: ;; CP H - move.b ehl,d2 + move.w ehl,d2 LOHI d2 F_CP_B d2,eaf DONE ;nok |