Memory expansion hardware for PSP11 computers

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6152839

Seymour, R J

Two hardware methods have been developed to expand MULTI's data storage region. They are usable by any UNIBUS PDP-11 program needing rapid random access to large data areas. The first, known as a Bus Mirror, is a modified DEC DR-11-B (DECKit 11-D) wired to allow program controlled modification of any location on the PDP11's UNIBUS. It performs and reads and writes in a DMA mode, and does not require use of CED's slow PLAS system directives. The second, known as Dataspace Memory, is a modified Plessey memory board operating like the Bus Mirror. It provides 64k words of additional storage on the UNIBUS, invisible to the normal UNIBUS addressing scheme. This has given us a PDP 11/60 with 188k words of memory, with a design limit of 33 megawords. These devices have brought our usable MULTI data space from 6k words to 24k words to 64k words.

• Research Organization: Washington Univ., Seattle (USA). Nuclear Physics Lab.
• DOE Contract Number: AC06-76ER01388
• OSTI ID: 6152839
• Report Number(s): DOE/ER/01388-494; CONF-810523-12; ON: DE81028322
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
990200* -- Mathematics & Computers
COMPUTERS
DATA ACQUISITION SYSTEMS
DEC COMPUTERS
MEMORY DEVICES
PDP COMPUTERS
PERFORMANCE
SEMICONDUCTOR DEVICES
SEMICONDUCTOR STORAGE DEVICES