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Fix HGR scrolling corruption with ISR #199

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Bobbi Webber-Manners
2022-12-21 20:35:59 -05:00
parent e228883700
commit 754271b618
1 changed files with 3 additions and 0 deletions
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3
mainmem.hgr.s
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@@ -146,6 +146,8 @@ DRAWCHAR >>> ENTMAIN
* Copy text line A+1 to line A * Copy text line A+1 to line A
HGRSCR1L >>> ENTMAIN HGRSCR1L >>> ENTMAIN
PHP ; Disable interrupts ..
SEI ; .. to prevent corruption while scrolling
INC MTXTWINRGT INC MTXTWINRGT
ASL ; Dest addr->A4L,A4H ASL ; Dest addr->A4L,A4H
TAX TAX
@@ -177,6 +179,7 @@ DOHGRSCR1L LDX #$00
INX INX
CPX #8 ; 8 pixel rows in character CPX #8 ; 8 pixel rows in character
BNE :L1 BNE :L1
PLP ; Re-enable interrupts
>>> XF2AUX,HSCR1RET >>> XF2AUX,HSCR1RET
* Copy text line A to line A+1 * Copy text line A to line A+1