What is a good example of a routine to invert the entire screen in asm?
I tried something like
Code: ld hl,plotsscreen
xor (hl)
ld de,plotsscreen
ld bc,768
ldir
call ionfastcopy
but it didn't do anything 
Code: ld bc, 12*64
ld hl, plotSScreen
loop:
ld a, (hl)
cpl
ld (hl), a
inc hl
dec bc
ld a, b
or a, c
jr nz, loop
Thanks!
By the way, PT_, I because I am not always connected to the internet while I am programming, I can't always use your hex separating program. So I made a BASIC program that separates a string of hex to make it usable for an asm program.
If you want to test it, here is the link:
https://drive.google.com/open?id=0B7tYBhSdXxlGVVBCTENubHlkczA
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