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Use php/sei/plp to preserve original state of the interrupt flag

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This commit is contained in:
Dan Sanderson
2025-11-28 11:09:21 -08:00
parent c14f2b7252
commit 5296d394e4
2 changed files with 4 additions and 2 deletions
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3
libsrc/c65/cpeekcolor.s
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@@ -18,6 +18,7 @@ _cpeekcolor:
lda SCREEN_PTR lda SCREEN_PTR
sta ptr1 sta ptr1
php
sei sei
lda $D030 lda $D030
ora #$01 ora #$01
@@ -28,8 +29,8 @@ _cpeekcolor:
lda $D030 lda $D030
and #$FE and #$FE
sta $D030 sta $D030
cli
tya tya
plp
ldx #>$0000 ldx #>$0000
rts rts

3
libsrc/c65/cputc.s
View File

@@ -116,6 +116,7 @@ putchar:
adc #>$D000 adc #>$D000
sta ptr4 + 1 sta ptr4 + 1
php
sei sei
lda $D030 lda $D030
ora #$01 ora #$01
@@ -125,6 +126,6 @@ putchar:
lda $D030 lda $D030
and #$FE and #$FE
sta $D030 sta $D030
cli plp
rts rts