Y, U, V and VID ‘straps’ are present on the PCB, if wire links are installed here then the relevant signals are carried out to the edge connector. The regulator and heatsink are situated at the bottom right of the PCB, the heatsink is a little undersized and such the machine can suffer from overheating problems. Can suffer from blue/yellow screen tinting which can usually be resolved by adjusting VR1/VR2, however other mods are sometimes required to completely cure this. There are no IC designations on the silkscreen, and the lower RAM is not properly arranged in bit order as found on later issues. It can only take 16K of RAM on the main PCB and required a daughterboard to supply the upper 32K, which plugs into two sockets at the top of the PCB. This has hand drawn PCB traces and has a prototype ‘feel’, and was laid out by Stuart Honeyball, whose later employment included Miracle Systems. The first Spectrum ever produced, manufacture commencing in April 1982. You can view a gallery of all the PCB revisions mentioned in this article at the bottom of the page. Cost reduced versions of the 128 architecture with some incompatibilities. The grey +2 was Amstrad’s first machine and was heavily derived from the 128 architecture. First produced for Investronica of Spain, later released in UK.
Here’s a brief overview of the various Spectrum PCB revisions, this section is split into three main areas:
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