If it doesn't survive then fear not, a nice new shiny membrane can be purchased form here for around £7.50.

The membranes are very fragile and may not survive being unplugged from the motherboard and folded round to connect on to the Minimus 32 USB Dev Board. I believe that the colours used in a USB lead is standard so should be left to right (Red, White, Green Black) I sleeved the shield of the cable and soldered that onto shield of the USB connector on the opposite side of the board. Using a multi-meter to work what each wire was I soldered them onto the Minimus. I passed the cable through a grommet I purchased from Maplins, I'm not happy with the grommet so still looking for an alternative cable gland. I had an old USB mouse that didn't work so cut the lead off and used that.

If you Solder them so no excess pin needs cutting this will leave the connecter proud allowing them to be gently bent out at an angle making it easier to connect the ribbon cables.Ī standard USB expansion cable to connect from the Minimus to the USB port of the PC or Raspberry Pi will work but I didn't want to buy a new cable and didn't know if the bulk of the connector would prevent the ZX Spectrum case from closing. The 8pin connector is soldered into PD0 to PD7of the Minimus with the contacts pointing inwards. The 5pin connector is soldered into PB2 to PB6 of the Minimus with the contacts pointing outwards. The Molex connectors need to be soldered onto the component side of the Minimus 32. There are 2 Molex connecters required for connecting the ribbon cables of the ZX Spectrum Keyboard to the Minimus USB.

Unreal speccy portable