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

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

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

Item Manufacturer Date
White Replica ZX Spectrum (Millionth Edition) Sinclair Unknown
Prototype of MK14 Sinclair 1977
Science of Cambridge MK14 + Original Keyboard Sinclair 1977
Science of Cambridge MK14 - Original Kit Sinclair 1977
Science of Cambridge MK14 + Memory Expansion in wooden case Sinclair 1977
Science of Cambridge MK14 Sinclair 1977
Sinclair ZX80 Updated to ZX81 Sinclair 1980
Sinclair ZX80 Sinclair 1st June 1980
Sinclair ZX80 Sinclair 1st June 1980
Sinclair ZX81 Kit Sinclair 1981
Sinclair ZX81 - Signed by Rick Dickinson Sinclair 5th March 1981
Sinclair ZX81 with Custom Case/Keyboard Sinclair 5th March 1981
Sinclair ZX81 Issue One Sinclair 5th March 1981
Argentinian Sinclair Spectrum Sinclair 1982
Sinclair Spectrum with Homemade Keyboard 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 QL + SchÖn Keyboard 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
Sinclair ZX Spectrum 128 Sinclair 1st June 1986
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

  Book Archive   [63]
  Games Archive   [1024]
  Software Archive   [84]
  Peripherals   [67]
  Promotional Items   [8]

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