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ZX Spectrum Issue 2 With ULA Modification

This early issue 2 Spectrum has some modifications to the system board (pictured). Serial number 001-019020. Kindly donated by Ruth Bramley.

The modification is known as the cockroach mod, it fixed some bugs in the ULA, only issue 1 and early issue 2 machines have this ULA.

Early issue 2 boards such as this, that use parts left over from issue 1 production are dubbed issue 1.5 by the Spectrum community to distinguish them from the later issue 2 board.

Manufacturer: Sinclair
Date: 1982



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ZX Spectrum Issue 2 With ULA Modification Manuals:

Item Manufacturer Date
A Course in BASIC Programming - ZX80 Operating Manual Science of Cambridge 1980
Disk Interface Manual (Technology Research) Technology Research 1984
Sinclair - ZX Spectrum Servicing Manual Sinclair Jan 1984
Sinclair ZX Spectrum +2 Manual Sinclair 1986
Spectral Manual (East German ZX Spectrum Clone) Hübner Elektronik 1988

ZX Spectrum Issue 2 With ULA Modification Articles:

Item Manufacturer Date
Memories - The Tatung Einstein (1) Unknown
Memories - My History of Computing - From a School Teacher Feb 2009

Magazines RELATED to ZX Spectrum Issue 2 With ULA Modification in our Library

Item Manufacturer Date
Your Computer - June 1982 Jun 1982
Personal Computer World - June 1982 1 Jun 1982
Personal Computer World - October 1982 Oct 1982
Personal Computer World - November 1982 Nov 1982
Personal Computer World - January 1983 Jan 1983
Practical Computing - August 1983 Aug 1983
Acorn User - Christmas 1995 1 Jul 2009
Acorn User - May 1997 15 Jul 2009

Other Systems Related To ZX Spectrum Issue 2 With ULA Modification:

Item Manufacturer Date
Prototype of MK14 Sinclair 1977
Science of Cambridge MK 14 + Original Keyboard Sinclair 1977
Science of Cambridge MK 14 - Original Kit Sinclair 1977
Science of Cambridge MK14 + Memory Expansion in wooden case Sinclair 1977
Science of Cambridge MK14 Sinclair 1977
Sinclair ZX80 8K Basic Sinclair 1980
Sinclair ZX81 with Basic EPROM Sinclair 1980
Sinclair ZX80 Prototype PDZ 4732 Basic ROM - Nine Tiles Sinclair 1980
Sinclair ZX80 Updated to ZX81 Sinclair 1980
Sinclair ZX80 Sinclair 1st June 1980
Sinclair ZX81 Kit Sinclair 1981
Sinclair ZX Spectrum Prototype Sinclair 1981
Sinclair ZX81 Issue One Sinclair 1981
Sinclair ZX81 - Signed by Rick Dickinson Sinclair 5th March 1981
Sinclair ZX81 with Custom Case/Keyboard Sinclair 5th March 1981
Argentinian Sinclair Spectrum Sinclair 1982
Sinclair Spectrum with Homemade Keyboard Sinclair 1982
White Replica ZX Spectrum (Millionth Edition) Sinclair 1982
Early Sinclair ZX Spectrum Computer Sinclair 1982
Timex Sinclair 1000 Sinclair 1982
Sinclair ZX Spectrum Console Sinclair 1982
Sinclair ZX Spectrum Console Sinclair 1982
Timex Sinclair 1500 Sinclair 1982
Sinclair ZX Spectrum Case (Signed) Sinclair 1st March 1982
Sinclair ZX Spectrum 48k Sinclair 1st March 1982
Sinclair ZX Spectrum 16K Sinclair 1st March 1982
Sinclair ZX Spectrum Computer - Early Issue Sinclair 23rd April 1982
Timex Sinclair 2068 Timex Sinclair November 1983 to 1989
Sinclair QL + SchÖn Keyboard Sinclair 1984
Investronica Sinclair Spectrum Sinclair 1984
Sinclair QL (German) Sinclair 1984
Sinclair QL (Signed) Sinclair 1984
Sinclair QL (US) Sinclair 1984
Sinclair QL (Property of Sinclair) Sinclair 1984
Sinclair QL Sinclair 1984
Sinclair ZX Spectrum+ Sinclair 1st June 1984
Sinclair ZX Spectrum +2 Sinclair 1986
Sinclair ZX Spectrum 128 Sinclair January 1986
Cambridge Z88 All In One Pack Sinclair 1987
Cambridge Z88 Sinclair 1987
Sinclair ZX Spectrum +3 (Currys Box) Sinclair 1st June 1987
Sinclair ZX Spectrum +3 Sinclair 1st June 1987
Sinclair PC200 Sinclair 1988
Cambridge Z88 With PC Link Kit Sinclair 1988

This exhibit has a reference ID of CH32957. Please quote this reference ID in any communication with the Centre for Computing History.

 

ZX Spectrum Issue 2 With ULA Modification

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