Recreation of the ZX Spectrum Issue 4B board in KiCAD
I don't know if this will be useful for anyone but when I was repairng my 48K boards i was referring to the schematics on Spectrumforeveryone but it was hard to read the schematics and there were one or two minor differences (missing R32 and IC3 & 4 had pin 12 connected twice) I recreated the schematic in KiCAD and becasue I was bored with time on my hands attempted to recreate the board layout as closely as possible.. I wouldn't advise using the layout to manufacture PCBs as the footprints are probably wrong, especially the coil and modulator but it should be useful for when you need to check continuity between connections. This is for the Issue 4B board. If I get time and there is demand I willt ry and get the other revisions done as well.
ZX-Spectrum-Issue-4B-KiCAD
iansbremner