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PATCH.ASM
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PATCH.ASM
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.INCLUDE "\VIDEO\sys\gsp.inc"
.globl TVPATCH,TVPATCHX
.globl TVBP,TVBPX
.globl SAVESCR
; .BSS OLDAUTOE,16,1
; .BSS OLDDSPON,16,1
.ref SYNCHALF,AUTOEOFF,DMAQWAIT
.ref NOAUTOE,DISPLAYON
.text
.even
OLDAUTOE: .word 0
OLDDSPON: .word 1
OLDINTEN: .word 0
SAVESCR: .word 0
TVBP:
mmtm SP,A0
MOVE @INTENB,A0,0 ;DISABLE ROM PROTECT INTERRUPT (ext2)
move A0,@OLDINTEN,0
ANDNI X2E,A0
ORI DIE,A0
MOVE A0,@INTENB,0
MOVE @SAVESCR,A0,0
jrz SkSave
PUSHST
EINT
CALLA SYNCHALF
MOVE @NOAUTOE,@OLDAUTOE,0
MOVK 1,A0
MOVE A0,@NOAUTOE,0
CALLA AUTOEOFF ;SHUT OFF AUTO-ERASE
MOVE @DISPLAYON,@OLDDSPON,0
CLR A0
MOVE A0,@DISPLAYON,0
CALLA DMAQWAIT ;BLOW OUT THE QUEUE'D IMAGES
POPST
SkSave:
mmfm SP,A0
rets
TVBPX:
mmtm SP,A0
MOVE @SAVESCR,A0,0
jrz SkUnSave
MOVE @OLDAUTOE,@NOAUTOE,0
MOVE @OLDDSPON,@DISPLAYON,0
SkUnSave:
; MOVE @INTENB,A0,0 ;ENABLE ROM PROTECT INTERRUPT (ext2)
move @OLDINTEN,A0,0
ORI X2E,A0
MOVE A0,@INTENB,0
MOVE @INTPEND,A0,0 ;Clear any pending X2E
ANDNI X2E,A0
ANDNI DIE,A0
MOVE A0,@INTPEND,0
mmfm SP,A0
rets
TVPATCH:
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TVPATCHX: