Sorry if this question was already answered somewhere:

I have this invert-screen function and want to know if there's one that takes less space. Storage optimization is more important than speed optimization. I couldn't find a B_CALL routine other than Invert-Box, which has its issues.

ld hl, plotsscreen
push hl
pop de
ld bc, 768
ld a, (hl)
ld (hl),a
jp pe, Loop
Just replace ldi with cpi then you don't have to load de.
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