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PDP-8 4K Disk Monitor System

From Wikipedia, the free encyclopedia
Early computer operating system
Operating system
8K DMS
DeveloperDigital Equipment Corporation
Written inPAL-D,FORTRAN-D,FOCAL
Working stateDiscontinued
Source modelClosed source
Supported platformsPDP-8
Default
user interface
Command-line interface
LicenseProprietary

ThePDP-8 Disk Monitor is a discontinuedoperating system released byDigital Equipment Corporation for theirPDP-8 line of mini-computers. The minimum hardware requirements consisted of aASR 33teletype,[1] 3 cycle data break (an option on the PDP-8/S model), and a mass storage option of a DF32 disk sub-system or a TC01DECtape unit, with later releases the additional option of using a RF08 disk drive. The distribution media was onpaper tape, a common means of data storage for computers of that era. The included user programs consisted mainly of modified versions of the paper tape software library distributed by DEC for their PDP-8 family of small computers, much of this was exported to theTSS-8 andMS/8 operating systems.

A modified version of this monitor was used on "8K or larger PDP 8/E" systems, with one of its claimed benefits being that it made better use of additional DECtape drives than OS/8.[2]

References

[edit]
  1. ^"PDP-8 spare parts"(PDF).
  2. ^P. R.Bell; R. S. Dillon; B. E. Beasley (October 1975)."Disk/Dectape Monitor for the TD8E".OAK RIDGE NATIONAL LABORATORY.
  • DEC DEC-08-SBAB-D PDP-8 Disk System Builder, October 27, 1967
  • DEC DEC-08-ODSMA-AD 4K Disk Monitor System, 2ed Revision, February, 1974
  • DEC DEC-D8-SDAB-D PDP-8/I Disk Monitor System Programmer's Reference Manual, Revised July, 1969
  • DEC DEC-08-AJBB-DL Advanced FOCAL Technical Specification, 1st Printing April, 1970

External links

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