PDP-8/e and terminals in West Sussex, UK

Tony Duell ard at p850ug1.demon.co.uk
Fri Nov 7 15:07:30 CST 2008


> Of course, that's another pdp-8! I have a DecMate III which I picked
> up at a Radio Rally, but it doesn't have an RX50, so I can't get
> it to do anything, apart from display its bios screen.

I assume you realise that an RX50 is just a pair of 80 cylinder single 
head floppy drives with a common disk spindle and common head stepper. 
The 34 pin interface cable is essentially the standard pinout. The only 
trap for the unwary (if I am reading the schematic correctly) is that if 
side select is asseted (this would select the other side of a double-head 
drive, of course), then the RX50 _disables_ its track 00 output. I think 
at least one machine used that feature to detect a real RX50.

-tony



More information about the cctech mailing list