PS/2 to USB converters, and other USB converters, usually have a small embedded processor that handles the protocol. A USB keyboard will respond, the XT keyboard will not. The host computer will interrogate a USB device using a Setup Token Packet.
There is a defined USB protocol to which peripherals such as keyboards must comply. Your core problem will lie in the communications protocols. I suspect with adaptor upon adaptor you are either losing voltage and therefore connectivity or the protocol is getting confused. The cable for the physical connection and the driver for the communications protocol. that you haven't connected + from the miniDIN to a - on the DIN) One last thing If you're going to make an adapter yourself, you should not connect the same colored cables from the DIN cable to the same colored cables from the miniDIN cable Always verify what cables you're connecting to what pins and double check if the polarization is OK (ie. The second adapter should be a passive one You can either make one yourself ( working schematic on the last picture) or buy one like the picture below online. If you have one lying around, you can always try it - your PC will be fine even if the keyboard won't work with this one. The first one should be a USB to PS/2 (miniDIN) adapter This one needs to be an active adapter, such as this one:Īvoid using weird smaller adapters like the one below - they probably won't work because they're designed for motherboards that have a PS/2 host, which allows them to be passive (motherboard will be in charge of changing D+ and D- from the USB port to Clock and Data signal from PS/2).
The easiest (PnP) approach is definely using two adapters.
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