Thanks!
Looks like I might have another suspect semi on there. At 10 cents a pop or less, I just bought a baggie of all of 'em.
But it looks like it'll work, and actually as of now it's semi-useful anyway. Right now, the main signal generating board's the last thing I need to worry about (it's as good as you'd expect for a dirty dusty board), so if you need a scan order, that guy's last.
Looks like Sencore's 'lifetime' support is about as goos as Tektronix's. Lifetime till they decide it's not...