Compukit UK101 (2)

The Compukit UK101 microcomputer (1979) was a kit clone of the Ohio Scientific Superboard II single-board computer, with a few enhancements for the UK market - notably replacing the 24x24 (add guardband kit to give 32x32) screen display with a more useful 48x16 layout working at UK video frequencies. The video output was black and white with 256 characters generated by a 2 KiB ROM. It had no bit-mapped graphics capability. The video was output through a UHF modulator, designed to connect to a TV set.
An assembled UK101, with original manual.It was powered by a 6502 microprocessor CPU running at 1 MHz, and was equipped with up to 8 kibibytes of RAM using 2114 static RAM chips of 1024x4-bit. An additional memory-mapped 1 KiB of RAM was used for the video display. It had the 8K Microsoft BASIC interpreter stored in ROM. In addition to Basic, a 6502 machine code monitor (2Kb) was built into ROM. It allowed programming by entering sequences of 6502 operational codes. Later a two pass assembler was available which allowed the use of assembly language.

In common with other home computers of the time, software could be saved and loaded on standard cassette tapes. The UK101 uses the Kansas City standard tape format. I/O was managed by a Motorola 6850 ACIA. This allowed a full RS232 port to be implemented, with the addition of a few extra components and minor modifications to existing jumpers on the board.

The 40 pin expansion socket opened up the world to the UK101. One could attach a dual floppy disk controller (5.5") and a memory expansion card (40K max) to allow faster and reliable save/load of programs/data.

Made in the UK by Compukit in New Barnet, North London, the UK-101 was originally a copy of the Ohio Scientific Superboard II. Two years and various legal battles later the UK-101 became, technically, behind its erstwhile rival.

You could buy the UK101 as a kit or as ready made for an extra fee. The kit came in a cardboard briefcase, in which there were anti-static tubes containing the 65+ ICs, a box of IC sockets, and bags containing passives (mainly 0.1uF ceramic decoupling capacitors) and keyboard bits (the keyboard switches were soldered directly to the PCB).

Our UK101 is mounted in a proprietary box and is complete with the following printed notes:
6502 Assembler / Disassembler
Toolkit for UK 101 and OHIO systems
Basic 4 notes
Memory Display and modification
CEGMON A new monitor for OSI and UK101 BASIC-In-ROM systems
Real Time Clock for Compukit UK101

OSI UK User Group Newsletters:
Vol 1 No 2 March 1980
Vol 1 No 3 June 1980
Vol 3 No 1
Vol 3 No 2

This item was kindly donated to us by Craig Cruickshank.

Manufacturer: Compukit
Date: 1979

Comment on This Page

Compukit UK101 (2) Manuals:

Item Manufacturer Date
Compukit UK101 Manual Compukit 1979

Other Systems Related To Compukit UK101 (2):

Item Manufacturer Date
Compukit UK101 Compukit 1979

This exhibit has a reference ID of CH20372. Please quote this reference ID in any communication with the Centre for Computing History.


Compukit UK101 (2)

  Software Archive   [1]
  Peripherals   [1]

Click on the Image(s) For Detail

User Submitted Articles

Add Your Article >>>

Help support the museum by buying from the museum shop

View all items

Founding Sponsors
redgate Google ARM Real VNC Microsoft Research
Heritage Lottery Funded
Heritage Lottery Fund
Accredited Museum