nostr:npub1jmg8nl2p25ex6juc9m60lce0hfstsh86wxz69yqqx2f6s33n2ursrr26zh You have a 512K card to try in another slot with the 2MB card? I tried the 1MB setting with four SIMMs and got what you described. Only when I added four more SIMMs (and not adding jumpers for banks 2 and 3) did I get a picture. There’s something weird happening. I have a video in this thread (starts with color bars) that has both lo and hi tones for comparison.