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The PDP-8 Disk Monitor is a discontinued operating system released by Digital Equipment Corporation for their PDP-8 line of mini-computers. The minimum hardware requirements consisted of a ASR 33 teletype, 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 TC01 DECtape unit, with later releases the additional option of using a RF08 disk drive. The distribution media was on paper 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 the TSS-8 and MS/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.

References

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

• http://www.faqs.org/faqs/dec-faq/pdp8/

v t e Digital Equipment Corporation
Key people	Ken Olsen (founder and CEO, 1957–1992) Harlan Anderson (co-founder) Gordon Bell (VP of engineering) Robert Palmer (CEO, 1992–1998)
Instruction set architectures, processors	PDP-11 LSI-11 F-11 T-11 J-11 VAX V-11 MicroVAX 78032 CVAX SOC Rigel Mariah NVAX Alpha Alpha 21064 21066 21068 Alpha 21164 (21164PC) Alpha 21264 Alpha 21364 Alpha 21464 Other MicroPRISM StrongARM
Computer terminals	VT05 (1970) GT40 (1972) VT50/VT52 (1975) VT55 VT62 VT100 (1978) VT101 VT102 VT103 VT105 VT131 VT180 VT220 (1983) VT240 VT241 VT320 (1987) VT330 VT340 VT420 (1990) VT1000 (1990) VT510 (1993) VT520 (1994) VT525
Operating systems	DECsys 4K DMS COS TOPS-10 RSX-15 TSS/8 OS/8 DOS-11 RT-11 RSTS/E RSX-11 IAS DSM-11 TOPS-20 VAX/VMS VAXELN Ultrix MICA Digital UNIX
Programming languages	BASIC-8 DIBOL FOCAL MACRO-10 MACRO-11 MUMPS VAX MACRO DIGITAL Command Language
Character sets	Code page 1100 (Multinational) Code page 1287 (Greek) Code page 1288 (Turkish) Hebrew National Replacement RADIX 50 Special Graphics Technical
Bus standards	Digital Storage Systems Interconnect Massbus Q-Bus Standard Disk Interconnect Synchronous Backplane Interconnect TURBOchannel Unibus VAXBI bus
Other hardware	DECtalk DECtape DECwriter Digital Linear Tape Dynamically Redefined Character Set Firefly Flip-Chip module Gold key LK201 LK421 Mass Storage Control Protocol PALcode RA90 RK05 RL02 Star coupler System Module TU81
Related topics	AdvFS AltaVista Compaq CPU Wars DECnet DECUS HP-Interex Digital Federal Credit Union Dynamic debugging technique FX!32 Local Area Transport Maintenance Operations Protocol On-line Debugging Tool PALcode Record Management Services ReGIS Sequence and Batch Language Sixel System Reference Manual Systems Research Center TD/SMP The Ultimate Entrepreneur VT640 WPS-8
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