Fingers Crossed for 2021 ...

2020 was the worst! COVID kept the museum closed for much of the year and a mains water pipe bursting causing a flood kept us closed for the rest. 
We're hoping to re-open in the next few months ... fingers crossed! Read More >>>

Please Donate Via Just GivingNo visitors, no workshops, no events, no school visits... no income. We know that things are tough for everyone right now, but if you can afford to help us through these tough times please donate what you can.

There's over 36,000 exhibits here! That should keep you occupied for a bit - get searching!

Or come and get involved on our social media channels ...

      Twitch  Facebook          Online Gift Shop      

Thank you.

Acorn System 1

An Acorn System 1 board with 5-pin DIN socket added to the left expansion port.

The System 1 was the first commercially available computer produced by CPU Ltd under the trading name of Acorn Computers Ltd. It was designed by Sophie Wilson and marketed as the Acorn Microcomputer in 1979. It was available in kit form for £70 or £81 assembled.

The System 1 consists of 2 Eurocards each measuring 100 x 160mm. The lower board contains the 6502 CPU, 1K RAM, a 16-way RAM I/O chip used by the keyboard, the monitor RAMS and address decoding circuitry. Sockets for an additional RAM I/O and 2K of EPROM are also included. Three switches may be added to the board to generate RESET, Non Masked Interrupt (NMI), and Interrupt Requests (IRQ) signals, or additional devices may be daisy-chained on to the board when more than one device which generates interrupts, or re-sets, is to be connected.

The re-set switch is duplicated on the upper board since the switches are hidden when the boards are mounted together. The upper board also contains the 25-key Hex keyboard, an eight-digit display, and a CUTS cassette interface.

The Acorn Microcomputer would later be developed into the System 2, 3, 4 and 5.

We also have the Acorn System 1 Users Manual in our collection.

Manufacturer: Acorn Computers Ltd
Date: March 1979

Comment on This Page

Acorn System 1 Manuals:

Item Manufacturer Date
Acorn System 1 - Users Manual Acorn Computers Ltd 1979

Other Systems Related To Acorn System 1:

Item Manufacturer Date
Acorn 6502 Microcomputer Board Acorn Computers Ltd 1979
Acorn BBC Micro Model A (Issue 2 Board) Acorn Computers Ltd 1981
Busicomputers Prophet 3 Acorn Computers Ltd 1982
Acorn System 4 Acorn Computers Ltd 1982
Acorn System 5 Acorn Computers Ltd 1983
Acorn Electron (Trial ROM From Astec) Acorn Computers Ltd May 1983
Acorn Electron (Trial ROM) Acorn Computers Ltd July 1983
Acorn Econet Terminal Acorn Computers Ltd 1986
Acorn AEH02 Archimedes NSM Acorn Computers Ltd 1987
Acorn Stork Notebook Acorn Computers Ltd 1996
Acorn Fast NC - Serial Number 1 Acorn Computers Ltd 1996

This exhibit has a reference ID of CH44946. Please quote this reference ID in any communication with the Centre for Computing History.


Acorn System 1

Click on the Image(s) For Detail


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