The X1531 cable


You need the following parts to build this cable:

  • One solderable 15-pin male D-SUB plug (PC game port)
  • One solderable 25-pin male D-SUB plug (PC parallel plug)
  • One solderable 7-pin female mini-DIN connector (C= 1531 Datasette)
  • A length of 6-wire cable, approx. 50 cm
  • Some heat-shrink insulator material

Step 1. Use a sharp knife to strip off the insulation from about 2/3 of the length of the cable. Seperate the wires into two strands, 2 and 4 wires each. Use heat-shrink insulator material to insulator the two strands again, so in the end your cable represents an Y-fork.

Step 2. Solder the 2 wires of the first strand to pins 1 (+5V) and 4 (GND) of the 15 pin plug.

Step 3. Solder the 4 wires of the second strand to the appropriate pins of the 25 pin plug.

Step 4. Solder the 6 wires on the other end of the cable to the 7-pin mini-DIN connector. Solder the two GND wires from the different plugs together, and add short lengths of wire to connect pins 1-7 and pins 2-5. You should have the following connections:

Mini-DIN plug 15-pin D-SUB plug 25-pin D-SUB plug
1, 7, GND 4, GND 18-25, GND
2, 3, +5V 1, +5V not connected
4, Read not connected 10, Ack
5, Write not connected 3, Data 1
6, Sense not connected 12, PaperEnd

Circuit diagram:

Source: The Joe Forster-STA homepage