---
title: EXTENSIS EX3000
categories:
- Computers
types:
- Home Computer
origins:
- U.S.A.
years:
- '1977'
cpus:
- '8085'
params:
  name: EX3000
  company: /companies/extensis
  company_name: EXTENSIS
  specs:
  - label: NAME
    value: EX3000
  - label: MANUFACTURER
    value: Extensis
  - label: TYPE
    value: Home Computer
  - label: ORIGIN
    value: U.S.A.
  - label: YEAR
    value: '1977'
  - label: BUILT IN LANGUAGE
    value: Unknown
  - label: KEYBOARD
    value: Unknown
  - label: CPU
    value: '8085'
  - label: SPEED
    value: Unknown
  - label: RAM
    value: 16 KB (up to 64 KB)
  - label: ROM
    value: 16 KB
  - label: TEXT MODES
    value: 80 x 24
  - label: GRAPHIC MODES
    value: Unknown
  - label: COLORS
    value: Unknown
  - label: SOUND
    value: Unknown
  - label: SIZE / WEIGHT
    value: Unknown
  - label: I/O PORTS
    value: Several cards (see lower)
  - label: BUILT IN MEDIA
    value: None (in standard)
  - label: OS
    value: EMOS
  - label: POWER SUPPLY
    value: Unknown
  - label: PERIPHERALS
    value: Unknown
  - label: PRICE
    value: Unknown
  tabs:
  - links
  links:
  - title: More information about the Extensis 3000
    url: http://www.tomshardware.com/2007/02/23/weird_and_wonderful_pcs_and_pc_mods/page5.html
    text: The Real World's 1st Multi-User/Multi-Tasking Micro
  oc_id: 48
  source:
    url: https://web.archive.org/web/20230208062406/http://www.old-computers.com/museum/computer.asp?c=48
    date: '2023-02-08'
---

The EX3000 Computer, a typical success(?) saga of the early personal computer days.

The Extensis Corp. EX3000 computer pulled together four emerging technologies; multiprocessor supercomputers, 8 bit microprocessors, the S100 bus standard and multiprocessor, multitasking multiuser operating systems.

The hardware of the EX3000 system consists of subsystems and boards. Three subsystems were provided :

FOS100 > Floppy disk subsystem (from one to four MB)\
MTS100 > Multiple terminal system with 8 or more independant RS232c serial interfaces\
TPS100 > Terminal / Operator Processor Subsystem with keyboard, CRT, RS232c and expanded video attributes.

And the following boards were included in the EX3000 :

RM64A > Memory board with 16 KB RAM\
MM16 > Memory Management board with bankswitching up to 1 MB.\
MPU8085 > 8085 Central processor with onboard PROM\
MPU800 > Optional Z80 CPU with onboard PROM

The operating system, EMOS, is a multi tasking, multi users operating system which provides memory protection for each user. It can handle the two processors simultaneously. Several languages were developped for this operating system : Extended Basic, Cobol and ANSI Fortran.

<table> <tr> <td></td> <td>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.</td> <td></td> </tr> </table>