Posted By
carrion
on 2018-04-24
11:10:23
 |  Re: IRQ Interrupt examples
OK
So what I have is quite the same but looks like my problem is elsewhere.
what I do is I set the multicolor and charmap to $2000 doing it like this:
lda #$18 // multicolor
sta $ff07
lda #$20
sta $ff13
and it works in Vice (I know its not perfect emulation) and doesn't work in Yape/Plus4Emu
I download the SVS xls memory map tool which I remember seeing and it was excellent
but maybe you could point me right here and now to what I do do wrong?
also what is the best way to change charmaps in many areas of the screen.
which solution is better:
to wait for raster like this:
lda #$d0
cmp $ff1d
bne *-3
or to do another irq and set fffe/ff vectors to poin at new raster line?
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