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O > OSM COMPUTER CORPORATION > Zeus 3X   


OSM Computer Corporation
Zeus 3X

OSM Computer Corporation, based in Santa Clara California, produced several multi-user CP/M computers called Zeus.

The Zeus 3X was released in 1983, and is a natural follow-up of previous systems: Zeus, Zeus II, Zeus 3. The Zeus 3X was available as the same time as the Zeus 4, in which it differs in some features (more users, more memory, tape drive, real time clock, etc.) making it more suited for larger companies.

The OSM Zeus 3X is a Z80 based multi-user computer that supports a single hard drive (from 12 to 140 Mb) and up to 32 users (8 only for the Zeus 4) via dumb terminals plugged into RS232 ports. The ports supports several terminal emulations as well as serial printers and modems.


The Zeus computer uses MUSE (Multi User System Executive) as its operating system, a CP/M compatible OS for multi-user computers from OSM. It incorporates all the standard features of CP/M, while adding file management capabilities such as multi-user file sharing, password protection, print spooling, data security and auto-searching. Later, the ZMOS operating system, another multi-user CP/M compatible OS, was also available.

In the november 1984's issue of Computerworld, there is an article describing how Pepsi bought and used Zeus 3X computers to help them cope with orders processing through these multi-user file sharing systems.

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NAME  Zeus 3X
MANUFACTURER  OSM Computer Corporation
TYPE  Professional Computer
ORIGIN  U.S.A.
YEAR  1983
CPU  Zilog Z80A
SPEED  4 MHz
RAM  64 Kb + 64 Kb x number of users (up to 32) = 2.1 Mb max.
TEXT MODES  80 x 25 CP/M standard
GRAPHIC MODES  none
COLORS  monochrome through terminal display
SOUND  None
SIZE / WEIGHT  10x19x27 inches / 60 lbs
I/O PORTS  4 x serial ports (2 users, 2 master), 1 x parallel port, 1 x 3270 synchronous port
BUILT IN MEDIA  Hard disk (from 12 to 140 Mb) + 20 Mb tape cartridge storage
OS  CP/M, M/PM, MUSE or ZMOS
POWER SUPPLY  Built-in PSU
PRICE  USA (1983) : $10,800 (4 users systems) / $2,294 (4 users increment)




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