Xerox 820-II

The Xerox 820 was an 8-bit desktop computer sold by Xerox. The computer featured floppy disk drives for mass storage, and used the CP/M operating system. The design of the microprocessor board was a licensed variant of the Bigboard computer.

The Xerox 820-II followed in 1982, featuring a Z80A processor clocked at 4.0 MHz. The units were priced starting at $3000.[1]

Hardware: The processor board was located inside the CRT unit, and included the Z80A, 64K of RAM (with optional expansion up to 32-34K), and 6-8K of ROM (expandable).

Screen: The CRT itself was a 24-line, 80-character (7x10 dot matrix) white-on-black monochrome display, with software-selectable variations such as reverse video, blinking, low-intensity (equivalent to grey text), and 4x4-resolution graphics.[1]

Communication ports These included two RS-232 25-pin serial ports (including one intended for a Xerox 620 or 630 printer or compatible) and two optional parallel ports which could be added via an internal pin header with either an official Xerox cable or one's own modification.

Keyboard: The keyboard was a bulky 96-character ASCII with a 10-key numeric keypad and a cursor diamond which otherwise defaulted to control characters 'A-D. It also included "Help" and "Line Feed" keys, and attached to the back of the CRT unit with a thick cable.[1]

Software: An example 820-II would come with a copy of CP/M 2.2, a diagnostic disk, a copy of MicroPro's WordStar suite, and Microsoft's BASIC-80.

Although it may be confusing to users of modern computers, the CRT unit contained the processor, and a large port on the back connected via heavy cable to a disk drive, allowing a wide variety of configurations. Disk drives could even be daisy-chained to each other via a port on the back of a unit.

Manufacturer: Xerox
Date: 1982

Xerox 820-II Manuals:

Item Manufacturer Date
Rank Xerox 820-II Rigid Disk Installation Guide Rank Xerox
Miscellaneous Engineer Instructions for the Xerox 820-II Xerox
Rank Xerox 3700 - Distributed Electronic Printing System - Government Branch - Introduction Rank Xerox
Xerox - Standard English Printwheels Xerox
SDS Sigma 5/7 Batch Processing Monitor Reference Manual SDS 1969
SDS Sigma 5/7 Batch Time-Sharing Processing Monitor Reference Manual SDS February 1969
XDS Sigma 3 Computer - Reference Manual Xerox Development Systems February 1970
Rank Xerox 820 - QSORT Xerox 15-10-1979
Rank Xerox 820 - COBOL 80 Reference Manual Xerox 1980
Rank Xerox 820 - COBOL 80 Users Guide Xerox 1980
Xerox Model 630 Communications Terminal - Operators Guide Xerox December 1980
Xerox Diablo Hyterm Primer Model 1640 Xerox 1981
Rank Xerox 820 Information Processor - CP/M Manual Rank Xerox 1981
Rank Xerox 820 - MACRO-80 Assembler Reference Manual Xerox 1981
Rank Xerox 820 - Diablo 630 Printer Manual Diablo 1981
Rank Xerox 820: Supercalc Manual July 1981
Rank Xerox 820 - BASIC-80 Reference Manual November 1981
Rank Xerox 820 - Sort-80 (MSORT) Xerox November 1981
Rank Xerox 820 - CBASIC-II - Reference Manual Xerox November 1981
Xerox - 610C Memorywriter Communication Handbook Xerox 1982
Rank Xerox - 8-inch DSSD Disc Drive - Maintenance Document Rank Xerox 1982
Corvus Systems - Installation and User Guide - Disk System - Xerox 820 Computers Corvus Systems 1982
Rank Xerox 820 - 5.25 Inch SS DS Disc Drive - Refurbishing Operation Summary Xerox May 1982
Rank Xerox 820 - Refurbishing Manual - Double Sided Disc Drive Xerox September 1982
Rank Xerox 820 - Refurbishing Manual - 5.25 SS and DS Disc Drive Modules Xerox September 1982
Xerox - Keyboard Setup - Version 10.42B Xerox 1983
Xerox - 820 IPS Processor PWB - Technical Guide - April 1983 Xerox April 1983
Xerox - Printer Control PWB - Technical Guide (for use in Service Centres) - issue 1 Xerox May 1983
Rank Xerox - 'Hotline' - Technical Bulletin Rank Xerox 18-08-1983
Xerox - 630 API Printer - Information Package Xerox October 1983
A.S.D. - Technical Service Planning and Support - 820 Family - Latest Information A.S.D. / Xerox February 1984
Xerox - 820-II Processor PWB - Technical Guide - May 1984 Xerox May 1984

Xerox 820-II Articles:

Item Manufacturer Date
The History of the Computer Mouse
A Research Center for Augmenting Human Intellect 09-12-1968

Magazines RELATED to Xerox 820-II in our Library

Item Manufacturer Date
Personal Computer World - January 1982 01-01-1982
Practical Computing - October 1982 October 1982
Practical Computing - June 1983 June 1983
Practical Computing - January 1984 January 1984
Personal Computer World - February 1984 February 1984
Practical Computing - March 1984 March 1984
Practical Computing - May 1986 May 1986
Personal Computer World - September 1987 01-09-1987
Personal Computer World - January 1989 01-01-1989
Personal Computer World - February 1989 01-02-1989
Personal Computer World - March 1989 01-03-1989
Byte November 1992 November 1992
Personal Computer World - February 1998 February 1998
Mac Format July 2004 July 2004
Byte September 1986 16-09-2009
Byte August 1997 29-09-2009
Byte September 1981 29-09-2009

Other Systems Related To Xerox 820-II:

Item Manufacturer Date
Xerox Diablo 3100 Xerox 1981
Xerox 820 16/8 Personal Computer Xerox 1983

This exhibit has a reference ID of CH3139. Please quote this reference ID in any communication with the Centre for Computing History.

 

Xerox 820-II

  Peripherals   [2]

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