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---
title: Cromemco Z-1
categories:
- Computers
types:
- Professional Computer
origins:
- U.S.A.
years:
- '1976'
cpus:
- Z-80
params:
name: Z-1
image: /media/museum/photos/cromemco_z1_1.jpg
company: /companies/cromemco
company_name: Cromemco
specs:
- label: NAME
value: Z-1
- label: MANUFACTURER
value: Cromemco
- label: TYPE
value: Professional Computer
- label: ORIGIN
value: U.S.A.
- label: YEAR
value: '1976'
- label: BUILT IN LANGUAGE
value: Basic Interpreter
- label: CPU
value: Z-80
- label: SPEED
value: 2 or 4 Mhz.
- label: RAM
value: 8 Kb. Static RAM (2 x 4 Kb. cards)
- label: ROM
value: 8 Kb.
- label: TEXT MODES
value: 25 lines x 80 char. with a RS-232 terminal
- label: I/O PORTS
value: 1 x Serial RS-232
- label: POWER SUPPLY
value: 28 amperes internal power supply
- label: PERIPHERALS
value: 22 card slots
- label: PRICE
value: 'Basic version : $2495'
tabs:
- adverts
forum_thread: 536
adverts:
- title: ADVERT
subtitle: ''
text: |-
Advert from Byte magazine (january 1977) said :
...It gets its speed and power from a selected version of the new Z80 microprocessor that can operate at a 4 Mhz. clock rate (The Z-1 also lets you switch to 2 Mhz. to be compatible with older systems)...\
...The Z-1 offers you all kinds of peripherals and softwares. It uses the standard ''S100'' bus supported by over a dozen manufacturers. And all Cromemco peripherals (PROM memory and programmer, Ram memory, analog I/O, color TV interface, etc) just plug into the Z1's sockets...\
... The Z-1 comes completely assembled ans tested. It's a quality, commercial grade microcomputer. It is not available as a kit.
image: /media/museum/pubs/cromemco_z1_pub_1.jpg
oc_id: 542
source:
url: https://web.archive.org/web/20230608222656/http://www.old-computers.com/museum/computer.asp?c=542
date: '2023-06-08'
---
The Cromemco Z-1 uses an IMSAI chassis, with 22 card slots and a 28 amperes (about 300 watts) power supply. The major innovation of the Z-1 is the use of the 4 Mhz version of the Z-80 processor. It is also equiped with its own 2708 type EPROM burner card.
Like the IMSAI, the Basic version of the Cromemco Z-1 is programmed through the front panel switches, and results are read from the front panel leds... Hopefuly, it is possible to connect a standard Video terminal through the serial port.