The latter covers the issue 2 and 3 spectrums and is related to the board layout diagrams available here and here. One for the case assembly and another for the board assembly. Parts lists for the zx spectrum are provided in table form.
See amstrad factory mods. Some boards have the capacitor c53 fitted and some have a capacitor soldered to the underside of the board or cpu. This schematic describes the circuit of a 2b with a z70833 issue 2 motherboard.
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Re draw revision 8 updated 2020 01 23. The zx spectrum 2b issue 2 motherboard pdf file. This was a reaction to the success of the 48k spectrum effectively establishing that model as the default spectrum.
Introduced late in 1982 issue 2 was very similar to its predecessor with the major difference being that all of the memory was now mounted directly on the board. For parts or not working shows black and shite stripes. Sinclair zx spectrum 16k issue 2 mother board rubber keys d01 048424.
Details about sinclair zx spectrum 16k issue 2 mother board rubber keys d01 048424 see original listing. I ve tested the board and it s not booting properly i get the screen visible in the last photo. Only the issue 2 motherboard from the zx spectrum 48k computer as visible in the first 3 photos.
Included in this sale. Issue 2 motherboard from the sinclair zx spectrum 48k computer. 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.
Kindly donated by ruth bramley.
Zx spectrum issue 2 board. Issue 4a and 4b schematics issue 4a layout. Issue 5 schematics and layout. Issue 6a schematics and layout. 128 issue 6u analogue and digital side schematics 2 z70500 issue 3 power section and main pcb schematics 2a 2b 3 family.
Guesser s spectrum schematics page covers the 2a 2b 3 family with excellently detailed. This followed the issue 1 quite quickly in august of 1982 and was the first spectrum issue to be laid out using cad tools. It also has provision for the full 48k of ram on the main pcb. Upper ram is limited to texas instruments ti4532 but oki 3732 can be used with a minor modifcation.
The zx spectrum uk. Z ɛ d ɛ k s is an 8 bit personal home computer released in the united kingdom in 1982 by sinclair research. Referred to during development as the zx81 colour and zx82 it was launched as the zx spectrum by sinclair to highlight the machine s colour display compared with the black and white display of its predecessor the zx81. The spectrum was released as eight.
Zx spectrum zx81 zx80 cambridge z88 timex sinclairs ql quantum leap c64 and c128 vic 20 c16 and plus 4 amiga pcs. Schematic diagram of the issue 2 spectrum circuit board issue 2 component layout. Component layout template of the issue 2 spectrum circuit board issue 3 board schematics. This early issue 2 spectrum has some modifications to the system board pictured.
This early issue 2 spectrum has some modifications to the system board pictured. Component layout template of the issue 2 spectrum circuit board issue 3 board schematics. Schematic diagram of the issue 2 spectrum circuit board issue 2 component layout.
Zx spectrum zx81 zx80 cambridge z88 timex sinclairs ql quantum leap c64 and c128 vic 20 c16 and plus 4 amiga pcs. The spectrum was released as eight. Referred to during development as the zx81 colour and zx82 it was launched as the zx spectrum by sinclair to highlight the machine s colour display compared with the black and white display of its predecessor the zx81.
Z ɛ d ɛ k s is an 8 bit personal home computer released in the united kingdom in 1982 by sinclair research. The zx spectrum uk. Upper ram is limited to texas instruments ti4532 but oki 3732 can be used with a minor modifcation.
It also has provision for the full 48k of ram on the main pcb. This followed the issue 1 quite quickly in august of 1982 and was the first spectrum issue to be laid out using cad tools. Guesser s spectrum schematics page covers the 2a 2b 3 family with excellently detailed.
128 issue 6u analogue and digital side schematics 2 z70500 issue 3 power section and main pcb schematics 2a 2b 3 family. Issue 6a schematics and layout. Issue 5 schematics and layout.
Issue 4a and 4b schematics issue 4a layout.
