website/content/museum/osm-computer-corporation-zeus-4.md

title, categories, types, origins, years, cpus, params

title	categories	types	origins	years	cpus	params
OSM Computer Corporation Zeus 4	Computers	Professional Computer	U.S.A.	1982	Zilog Z80A	name image company company_name specs tabs forum_thread photos adverts oc_id source Zeus 4 /media/museum/photos/osm_zeus4_1s.jpg /companies/osm-computer-corporation OSM Computer Corporation label value NAME Zeus 4 label value MANUFACTURER OSM Computer Corporation label value TYPE Professional Computer label value ORIGIN U.S.A. label value YEAR december 1982 label value CPU Zilog Z80A label value SPEED 4 MHz label value RAM 64 Kb + 64 Kb x number of users (up to 8) = 576 Kb max. label value TEXT MODES 80 x 25 CP/M standard label value GRAPHIC MODES none label value COLORS monochrome through terminal display label value SOUND None label value SIZE / WEIGHT 8x13x15 inches / 24,6 lbs label value I/O PORTS 4 x serial ports (2 users, 2 master), 2 x parallel ports, label value BUILT IN MEDIA Hard disk (from 6 to 25 Mb) + 5.25'' floppy disk drive (standard 250 Kb or IBM 1 Mb) label value OS CP/M, M/PM, MUSE or ZMOS label value POWER SUPPLY Built-in PSU label value PRICE USA (1983) : $5,595 (2 users systems) / $1000 (2 users increment) / $8,595 (8 users configuration) photos adverts 1300 title subtitle text image ZEUS 4 null title subtitle text image ZEUS 4 IN ACTION null title subtitle text image US ADVERT (1983) /media/museum/pubs/osm_zeus-4_pub-1983.jpg title subtitle text image US ADVERT (DEC. 1983) /media/museum/pubs/osm_zeus-4_pub-dec-1983.jpg title subtitle text image ZEUS FAMILY SPECIFICATIONS dated 1983 null 1335 url date https://web.archive.org/web/20230415212108/http://www.old-computers.com/museum/computer.asp?c=1335 2023-04-15

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

The Zeus 4 was released in 1982, and is a natural follow-up of previous systems: Zeus, Zeus II, Zeus 3 and Zeus 3x.

The OSM Zeus 4 is a Z80 based multi-user computer that supports a single hard drive (from 6 to 25 Mb) and up to 8 users (4 on first models) via dumb terminals plugged into RS232 ports. The ports supports several terminal emulations as well as serial printers and modems.

The Zeus 4 supports the 3270 data communication protocol, which permits the system to exchange information with IBM or IBM-compatible host mainframes.

There are three electronic boards inside the computer. One is the disks controller, the middle one is the master CPU and the last one is the slave CPU board. On the slave board there are 2, 4 or 8 entire Z80 based computers. There are all "Networked" to the master board through a ribbon cable on the side.

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.

When OSM went out of business another company purchased their stock and manufactured a new version called the Zeus 4x that supported 16 users.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.