Binary Dinosaurs @binarydinosaurs.co.uk · Mar 28

All set up at @computinghistory.org.uk, ‘live’ debugging of the Positron 9000.

58 likes 3 replies

?

Replies

Binary Dinosaurs · Mar 28

Aaaand I’ve discovered that the reason (or one of them) it doesn’t boot is the stack is either corrupt or isn’t being written to, so it does an LBSR call and can’t return because the stack contains 0xFFFF instead of 0xF18A. So it could be that nothing is asserting /WR for the RAM.

Tom Stepleton · Mar 28

Ha yes, that's the way to do an exhibit at a retro computer show! (Don't I know it...)

I

Ian Parr · Mar 28

oof thats a beast. It dwarfs the huge HP analyser.