Game:

Pokémon Yellow (1998)

Duration: 1:42

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36

call 3E6D ; Grab a random value
ld hl,8000 (start of video RAM)
ld bc,yyxx (size of corruption)
call 166E ; fill the memory hl of size bc
ret

VRAM is 0x2000 bytes long, so 2000 will span the VRAM. However, the effect of VRAM inaccessibility will result in black lines. You can also change hl to somewhere else on the memory map, e.g. to fill the RAM with random values. https://gbdev.io/pandocs/Memory_Map.html

NPC sprites are 8000-8FFF (size 0x1000)
Map tiles are 9000-9800 (size 0x0801)

A save file is coming shortly

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