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trying clean disable of interrupts

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This commit is contained in:
Brooke Vibber 2022-11-29 12:59:26 -08:00
parent f9431749d2
commit 1f813b4e8e
1 changed files with 8 additions and 6 deletions
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14
dither4.s
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@ -8,6 +8,7 @@ COLPF2 = $D018
COLPF3 = $D019 COLPF3 = $D019
COLBK = $D01A COLBK = $D01A
DMACTL = $D400
WSYNC = $D40A WSYNC = $D40A
VCOUNT = $D40B VCOUNT = $D40B
NMIEN = $D40E NMIEN = $D40E
@ -82,7 +83,7 @@ displaylist:
; Disable display DMA ; Disable display DMA
lda #$00 lda #$00
sta SDMCTL sta DMACTL
; Set up the display list ; Set up the display list
lda #.lobyte(displaylist) lda #.lobyte(displaylist)
@ -90,10 +91,6 @@ displaylist:
lda #.hibyte(displaylist) lda #.hibyte(displaylist)
sta SDLSTH sta SDLSTH
; Disable VBI and DLI but allow Reset
lda #(128 + 64)
sta NMIEN
; Manually wait for first scan line ; Manually wait for first scan line
wait_vblank: wait_vblank:
lda VCOUNT lda VCOUNT
@ -101,7 +98,12 @@ wait_vblank:
; Re-enable display DMA ; Re-enable display DMA
lda #$22 lda #$22
sta SDMCTL sta DMACTL
; Disable VBI and DLI but allow Reset
lda #32
sta NMIEN
wait_loop: wait_loop:
sta WSYNC sta WSYNC