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DivideBCDPredef::
DivideBCDPredef2::
DivideBCDPredef3::
DivideBCDPredef4::
call GetPredefRegisters
DivideBCD::
xor a
ld [$ffa5], a
ld [$ffa6], a
ld [$ffa7], a
ld d, $1
.asm_f72a
ld a, [$ffa2]
and $f0
jr nz, .asm_f75b
inc d
ld a, [$ffa2]
swap a
and $f0
ld b, a
ld a, [$ffa3]
swap a
ld [$ffa3], a
and $f
or b
ld [$ffa2], a
ld a, [$ffa3]
and $f0
ld b, a
ld a, [$ffa4]
swap a
ld [$ffa4], a
and $f
or b
ld [$ffa3], a
ld a, [$ffa4]
and $f0
ld [$ffa4], a
jr .asm_f72a
.asm_f75b
push de
push de
call DivideBCD_f800
pop de
ld a, b
swap a
and $f0
ld [$ffa5], a
dec d
jr z, .asm_f7bc
push de
call DivideBCD_f7d7
call DivideBCD_f800
pop de
ld a, [$ffa5]
or b
ld [$ffa5], a
dec d
jr z, .asm_f7bc
push de
call DivideBCD_f7d7
call DivideBCD_f800
pop de
ld a, b
swap a
and $f0
ld [$ffa6], a
dec d
jr z, .asm_f7bc
push de
call DivideBCD_f7d7
call DivideBCD_f800
pop de
ld a, [$ffa6]
or b
ld [$ffa6], a
dec d
jr z, .asm_f7bc
push de
call DivideBCD_f7d7
call DivideBCD_f800
pop de
ld a, b
swap a
and $f0
ld [$ffa7], a
dec d
jr z, .asm_f7bc
push de
call DivideBCD_f7d7
call DivideBCD_f800
pop de
ld a, [$ffa7]
or b
ld [$ffa7], a
.asm_f7bc
ld a, [$ffa5]
ld [$ffa2], a
ld a, [$ffa6]
ld [$ffa3], a
ld a, [$ffa7]
ld [$ffa4], a
pop de
ld a, $6
sub d
and a
ret z
.asm_f7ce
push af
call DivideBCD_f7d7
pop af
dec a
jr nz, .asm_f7ce
ret
DivideBCD_f7d7:
ld a, [$ffa4]
swap a
and $f
ld b, a
ld a, [$ffa3]
swap a
ld [$ffa3], a
and $f0
or b
ld [$ffa4], a
ld a, [$ffa3]
and $f
ld b, a
ld a, [$ffa2]
swap a
ld [$ffa2], a
and $f0
or b
ld [$ffa3], a
ld a, [$ffa2]
and $f
ld [$ffa2], a
ret
DivideBCD_f800:
ld bc, $3
.asm_f803
ld de, $ff9f
ld hl, $ffa2
push bc
call StringCmp
pop bc
ret c
inc b
ld de, $ffa1
ld hl, $ffa4
push bc
call SubBCD
pop bc
jr .asm_f803
AddBCDPredef::
call GetPredefRegisters
AddBCD::
and a
ld b, c
.add
ld a, [de]
adc [hl]
daa
ld [de], a
dec de
dec hl
dec c
jr nz, .add
jr nc, .done
ld a, $99
inc de
.fill
ld [de], a
inc de
dec b
jr nz, .fill
.done
ret
SubBCDPredef::
call GetPredefRegisters
SubBCD::
and a
ld b, c
.sub
ld a, [de]
sbc [hl]
daa
ld [de], a
dec de
dec hl
dec c
jr nz, .sub
jr nc, .done
ld a, $00
inc de
.fill
ld [de], a
inc de
dec b
jr nz, .fill
scf
.done
ret
|
