Posted By
gerliczer
on 2017-01-14
15:48:50
|  Re: VB interrupt. How do you get it to trigger?
I'm not quite sure what you are trying to do Stinaris, but this code
org $1001-2
dw $1001
dw nextln, 2017 ; second word is line number
db $9E
if start > 9999
db "0"+start/10000
endif
db "0"+(start/1000)%10,"0"+(start/100)%10,"0"+(start/10)%10,"0"+start%10,0
nextln db 0,0
start
sei
sta $FF3F
lda #$FF
cmp $FF1D
bne *-3
lda #4+19*8
sta $FF0B
lda #2
sta $FF0A
asl $FF09
lda #lo(irq)
sta $FFFE
lda #hi(irq)
sta $FFFF
cli
jmp *
irq
asl $FF09
inc $FF19
ldx #0
loop
lda $0801+000,x
sta $0800+000,x
lda $0801+040,x
sta $0800+040,x
... imagine the rest here
lda $0801+760,x
sta $0800+760,x
inx
cpx #39
bne loop
dec $FF19
rti
finishes copying quite swiftly. Code was written in Csabo's Plus4IDE. Copying starts five character rows before screen end. And if there is nothing in the ROM that you need to use no matter what in your program, then you're better off paging it out.
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