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timer interrupt

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This commit is contained in:
yenatch 2013-08-27 23:38:05 -04:00
parent e48899c1f4
commit 8898f63fc7
1 changed files with 16 additions and 7 deletions
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23
main.asm
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@ -41,7 +41,7 @@ SECTION "lcd",ROM0[$48] ; lcd interrupt
jp LCD
SECTION "timer",ROM0[$50] ; timer interrupt
jp Function3e93
jp Timer
SECTION "serial",ROM0[$58] ; serial interrupt
jp Function6ef
@ -328,7 +328,7 @@ AskTimer: ; 591
ld a, [$ffe9]
and a
jr z, .asm_59a
call Function3e93
call Timer
.asm_59a
pop af
@ -10975,28 +10975,36 @@ Function3e80: ; 3e80
; 3e93
Function3e93: ; 3e93
Timer: ; 3e93
push af
push bc
push de
push hl
ld a, [$ffe9]
and a
jr z, .asm_3ed2
xor a
ld [rTAC], a
; Turn off timer interrupt
ld a, [rIF]
and $1b
and 1 << VBLANK | 1 << LCD_STAT | 1 << SERIAL | 1 << JOYPAD
ld [rIF], a
ld a, [$c86a]
or a
jr z, .asm_3ed2
ld a, [$c822]
bit 1, a
jr nz, .asm_3eca
ld a, [rSC]
and $80
and 1 << rSC_ON
jr nz, .asm_3eca
ld a, [hROMBank]
push af
ld a, $44
@ -11004,16 +11012,17 @@ Function3e93: ; 3e93
rst Bankswitch
call $58de
pop bc
ld a, b
ld [$c981], a
rst Bankswitch
.asm_3eca
ld a, [rTMA]
ld [rTIMA], a
ld a, $6
ld a, 1 << rTAC_ON | rTAC_65536_HZ
ld [rTAC], a
.asm_3ed2