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all QBASIC tutorials:
"your scrollers need something to scroll from, so always hold a screen mirror in an array, draw to that and blit it to the screen"
but like
i can scroll anything on screen in Mode 13 with PEEK/POKE. In like... 7 lines? Probably 5 if I fuck with it some?
it's even fast enough to only take 3 frames to scroll one pixel on a 2GHz vCPU!
rant