Identity area
Reference code
Heritage collection CERN-OBJ-CERN-OBJ-IT-095
Title
A Diode Matrix model M792
Date(s)
Level of description
Item
Extent and medium
Object
Context area
Repository
Archival history
Immediate source of acquisition or transfer
Content and structure area
Scope and content
A diode matrix is an extremely low-density form of read-only memory. It's one of the earliest forms of ROMs (dating back to the 1950s). Each bit in the ROM is represented by the presence or absence of one diode. The ROM is easily user-writable using a soldering iron and pair of wire cutters.This diode matrix board is a floppy disk boot ROM for a PDP-11, and consists of 32 16-bit words. When you access an address on the ROM, the circuit returns the represented data from that address.
Appraisal, destruction and scheduling
Accruals
System of arrangement
Conditions of access and use area
Conditions governing access
Public
Conditions governing reproduction
Language of material
Script of material
Language and script notes
Physical characteristics and technical requirements
21 cm 27 cm
Finding aids
Generated finding aid
Allied materials area
Existence and location of originals
On loan, 513-R-052.
Existence and location of copies
Related units of description
Notes area
Alternative identifier(s)
CDS number
2274962
