I had the good fortune of rescuing a quite clean MODCOMP II/12 today! The system has 64K of core memory, full front panel and separate I/O chassis and I/O panel. The I/O chassis contains a dual 9600 baud serial interface, a high-speed synchronous interface and a TTY controller (110-9600 baud). Does anyone on the list have schematics and/or writeups on Modcomp serial or other peripherals? If so, I'd really appreciate a pointer to the PDFs. If you don't have them in PDF form, I'll be glad to pay the cost for hard copies and shipping. Cheers, Lyle -- Lyle Bickley Bickley Consulting West Inc. Mountain View, CA http://bickleywest.com "Black holes are where God is dividing by zero"