A screen full of dots, with a repeating pattern of blanks about 15 characters long, going leftwards as the lines go down
https://digipres.club/system/media_attachments/files/111/927/621/011/823/740/original/bb76b56af82b2b63.png
so I found a character (period) that's visible normally but not when gibberished, and filled the screen with it.
ta-da! I now have a visual map of where the memory is corrupted.
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