---
title: IMSAI PCS 80
categories:
- Computers
types:
- Professional Computer
origins:
- U.S.A.
years:
- '1977'
cpus:
- Intel 8080 - IMSAI PCS 80
params:
  name: PCS 80
  image: /media/museum/photos/imsai0.jpg
  company: /companies/imsai
  company_name: IMSAI
  specs:
  - label: NAME
    value: PCS 80
  - label: MANUFACTURER
    value: IMSAI
  - label: TYPE
    value: Professional Computer
  - label: ORIGIN
    value: U.S.A.
  - label: YEAR
    value: '1977'
  - label: BUILT IN LANGUAGE
    value: None
  - label: KEYBOARD
    value: Video terminal
  - label: CPU
    value: Intel 8080 - IMSAI PCS 80/30 came with
  - label: SPEED
    value: 3 MHz
  - label: RAM
    value: 2.25 KB (up to 64 KB thanks to RAM boards, there are 4K, 16K, 32K and 64K memory expansion boards).
  - label: ROM
    value: 3 KB (Including monitor)
  - label: TEXT MODES
    value: 12x40, 12x80, 24x40 and 24x80 (128 characters of either 5x7 or 7x10 dot matirx fonts)
  - label: I/O PORTS
    value: Serial ports (2) - Parallel Port (1) - Monitor - S100 Bus (8 expansion slots)
  - label: OS
    value: 8K DOS based upon CP/M
  - label: POWER SUPPLY
    value: built-in 28AMP power supply unit
  - label: PERIPHERALS
    value: Floppy drives inteface, Single or dual 8'' drives in a separate housing same size as main frame unit
  tabs:
  - photos
  forum_thread: 346
  photos:
  - title: THE PCS-80 COMPONENTS
    subtitle: ''
    text: ''
    image: /media/museum/photos/imsai_pcs80_components_1.jpg
  - title: THE PCS 80 MODEL 15
    subtitle: ''
    text: ''
    image: /media/museum/photos/imsai_pcs80_model15_1.jpg
  - title: THE PCS-80 MODEL 30
    subtitle: ''
    text: ''
    image: /media/museum/photos/imsai_pcs80_mod30_1.jpg
  oc_id: 342
  source:
    url: https://web.archive.org/web/20230608155226/http://www.old-computers.com/museum/computer.asp?c=342
    date: '2023-06-08'
---

The PCS 80 came with a lot of peripherals: line and character printers, CRT terminals, intelligent keyboards, ACR storage, 8" and 5.25" floppy disks and with several languages: TTY BASIC with OS, 4K, 8K and 12K BASIC, audio cassette BASIC with OS, & a scientifically oriented disk BASIC and level 2 Fortran IV compiler.

**Greg Bober** stil have an extended working configuration including:\
• External 5.25" quad density 380Kb Micropolis floppy with BASIC,\
• Faster memory & "I" tempgrade CPU, speed could goto 7MHz,\
• 58K 10MHz RAM,\
• Custom boot operating system,\
• 64K of extended RAM/ported PROM containing the DOS & BASIC operating system to have 1 second versus 30 second floppy boot up,\
• Extrernal 12" monitor since 24x80 is hard to see on tiny screen,\
• Spare parts.\
Numerous photos of his system may be seen [here](http://www.smallscalerailway.com/PCS80%20IMSAI.htm).