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X > XEROX  > 820-II   


The model 820-II is basically a model 820 with a higher clock rate (4 MHz instead of 2.5 MHz) and a 8" double density/double side disk-drive and hard-disk instead of the the two basic 8" Single density/single side disk-drive of the first model 820. But the hard-disk is said to be very noisy and the dual disks weigh more than 38 pounds!

Nearly all the hardware is housed within the monitor, a bit like a Macintosh. The separate keyboard is linked to the monitor by a "not-long-enough" cord. The 8" disk-drive and hard-disk are mounted in a separate huge box. The 10MB hard drive for example was boxed with an 8" drive. A real-time clock is included in the hardware. Green screens were available in all models since the screen/processor case was common to all.

Like its predecessor, the 820-II is well furnished in software of all sorts. Thanks to its CP/M compatibility nearly every profession can find a suitable program. A lot of languages and OS were also available (CP/M, Basic 80, C Basic 2, Assembler Macro 80, Cobol 80, Short 80, TTY communication, 3270/3780 emulation).
But the 820-II has no real graphic possibilities nor sound, and a small RAM capacity (64 KB) for a professional computer. Above all it was quite expensive compared to its competitors.

There was also WP dedicated versions with unique key caps.

A 16-bit expansion board was released to upgrade the 820-II, so that its performance would nearly match the new Xerox computer(the 16/8), and also allowed the 820 to work under DOS. At the start of the year 1985, Xerox would definately leave the micro-computer market and stop the production of the 820.


Contributors: Jeremy Wilcox, Bronislaw Opacki Jr

Dale Carpenter clarifies:
I started working for Xerox in 1983 as a PC tech in the Xerox Service Center a sevice/support part to the retail store they had back then.
820-II's were the next step after 820's they were already double density instead of upgraded like many 820's were. They also supported double sided drives.
The drive choices were 5.25" dual drives single or double sided, 8" dual drives also single or double sided and the top was a 8"double sided floppy paired with a 8" 10Mb Shugart hard drive.The 8" double density, 2-sided floppies had a capacity of 960K which was a lot for back then.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


Again, not a "bad" computer per se, but much better was out there in 1983. 8" floppies where already sliding into obsolescence. Some of the same great software was becoming available for the new IBM PC and PC/XT and the new Apple //e had some great productivity software coming soon. This was a case of too little improvement coming too late. A Kaypro 10 was a better deal that was at least as good, or better, at a lower price and excellent build quality. Xerox leadership was caught in the 1970''s or something.

Sunday 7th August 2022
Larry Sh. (USA)

ok boomer

Wednesday 1st December 2021

Nice to see my original post at bottom of page after all these years, I still have that old computer, thanks to all who run and contribute to this site.

Friday 14th April 2017
Joe (Tj, Mex) (Mexico)


NAME  820-II
TYPE  Professional Computer
YEAR  1983
BUILT IN LANGUAGE  Basic 80 delivered on disk
KEYBOARD  AZERTY/QWERTY, full-stroke keyboard with separated keyboard, 74 keys
SPEED  4 Mhz
RAM  64 kb
ROM  8 kb
TEXT MODES  80 x 24 (character matrix : 5 x 7)
12'' black & white monitor
COLORS  Black & white
SIZE / WEIGHT  Main unit / monitor : 32,8 x 38,1 x 34,3 cm / 13,6 kg
I/O PORTS  Serial 9600 bauds, Internal Expansion Slot, External Floppy Connector
BUILT IN MEDIA  one 8'' disk-drive (DD/DS) (320 KB) and one 8'' hard-disk (10MB).
OS  CP/M 2.2
PERIPHERALS  Additional disk-drives, printer, modem, 16-bit board
PRICE  9832 (France, 83)

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