ZX Spectrum Issue 2 With ULA Modification

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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
Technology Research Disk Interface Manual	Technology Research Ltd	1984
Servicing Manual for ZX Spectrum	Sinclair Research Ltd	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

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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
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Sinclair ZX81 Kit	Sinclair	1981
Sinclair ZX Spectrum Prototype	Sinclair	1981
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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
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Sinclair ZX Spectrum Case (Signed)	Sinclair	1st March 1982
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Sinclair ZX Spectrum 16K	Sinclair	23rd April 1982
Sinclair Spectrum (Assembled in Portugal)	Sinclair	1983
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
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Sinclair ZX Spectrum +3	Sinclair	1st June 1987
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