Guides:Fast 0x1500 ACE: Difference between revisions
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Line 488:
E1 pop hl ; hl = $F500
E6 EF and $F5 ; a = $E5
84 add a, h
F5 push af
50 ld d, b
Line 497:
D0 ret nc ; On first pass, ignored. Taken whenever $DB7F is called
D6 B9 sub $B9 ; a = $21
EA 81 FB
50 ld d, b
Box 3: $DB87
D6 FF sub $FF ; a = $22
EA 7F FB
D6 F4 sub $F4 ; a = $2E
85 add a, l
50 ld d, b
Box 4: $DB90
D4 7F FB
E6 84 and $84 ; a = $04
D4 7F FB
50 ld d, b
Box 5: $DB99
D6 D4 sub $D4 ; a = $30
EA 89 FB
D6 FE sub $FE ; a = $32
FB ei
Line 521:
Box 6: $DBA2
EA 85 FB
D6 F1 sub $F1 ; a = $41
EA 88 FB
50 ld d, b
Box 7: $DBAB
F6 82 or $82 ; a = $C3, reset carry flag
D4 7F FB
EA 87 FB
50 ld d, b
Box 8: $DBB4
AF xor a ; a = $00
EA 86 FB
F5 push af
D6 A7 sub $A7 ; a = $59
Line 541:
Box 9: $DBBD
D4 7F FB
EA 82 FB
D6 81 sub $81 ; a = $D8
50 ld d, b
Line 548:
Box 10: $DBC6
A7 and a ; Reset carry flag
D4 7F FB
EA 83 FB
F1 pop af ; a = $00
50 ld d, b
Line 555:
Box 11: $DBCF
D6 FF sub $FF ; a = $01
EA 84 FB
E1 pop hl ; first of two pops to prevent side effects of 0x1500 ACE
F6 FF or $FF ; a = $FF
Line 561:
Box 12: $DBD8
D4 81 FB
EA 82 FB
E1 pop hl ; second of two pops to prevent side effects of 0x1500 ACE
D6 50 sub $50 ; a = $AF
Box 13: $DBE1
D6 E1 sub $E1 ; a = $CE
EA 93 F8
A7 and a ; Reset carry flag
D0 ret nc
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