DEC PDP-11/70

From neurotica.com

This is one of my most prized possessions, a near-pristine DEC PDP-11/70. This one is of the somewhat unusual DECdatasystem-570 configuration, which is built into shorter-but-wider racks and painted in a blue color scheme as compared to the usual purple. The DECdatasystem machines were usually marketed to business customers as opposed to scientific applications.

It was in service for nearly twenty years at a printing company in Pennsylvania. It, along with its two sister machines, ran all job scheduling for the printing presses, as well as ran all of the "business" stuff like accounting, payroll, and customer database management. I, along with my friends Brian and Sridhar, adopted all three of the machines. Brian and I rented a truck and picked them up in the fall of 2002.

This system works as well today as it did when it was built in 1974. It runs the RT-11 and RSTS/E operating systems. I fire it up every so often for fun, for data recovery jobs, or to demonstrate to guests.

Configuration

• KB11-C processor
• 768KB of RAM (a lot for 1975!)
• RL11 disk controller
• Three RL02 disk drives (10MB removable)
• Emulex SC70 SMD controller
• 2x Fujitsu M2312K 67MB SMD drives
• TE16 9-track magtape drive
• DELUA Ethernet controller
• DZ11 8-line serial multiplexer

Photos

PDP-11/70 system	PDP-11/70 system	PDP-11/70 system	PDP-11/70 system
KB11-C processor	KB11-C processor	KB11-C processor	KB11-C processor
KB11-C processor	KB11-C processor	KB11-C processor	MJ11 core memory subsystem (inactive)
MK11 MOS memory subsystem	MK11 MOS memory subsystem	MK11 MOS memory subsystem	MK11 MOS memory subsystem
RL11 disk controller