Philips PM5544 electronic testcard

[ppppenguin]

Thank you. I'm just glad nothing was wrong with the core store itself. Everything else is fixable, all discretes and very ordinary TTL. There's what looks like a mask programmed ROM, tiny by modern standards, in the text generator. If that had been duff I could have reconstructed the contents and put them in a modern EPROM.

When the SN7525 chips arrive I'll remove my bodge.