PS/2 keyboard adapter, pass-though
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ZX Spectrum 48/48+ PS/2 keyboard adapter, based on https://www.avray.ru/zx-spectrum-ps2-keyboard/
This is "bis" version which adds additional compatibility.
Technical details:
Keys mapping:
The device works in one of two modes selected by shorting one of the jumpers (you can use 0R resistor as per photo):

Our tests show, that some ZX Spectrums prefer second work mode, some work in both, others only in first. This is down to the specific unit.