The Commodore parallel cable

for Commodore 1570 and 1571 drives

You should follow these instructions if you want to connect the cable directly onto the periphery chip in the drive.


You need the following parts to build this cable:

  • One solderable user port plug
  • A shielded or unshielded 10-wire cable of, preferably at most, 2 meters

Step 1. Solder one end of the cable right onto the CIA periphery chip inside the drive.

Step 2. Solder the other end of the cable onto the user port plug. You should have the following connections:

CIA User port plug
 10, PB0  C, PB0
 11, PB1  D, PB1
 12, PB2  E, PB2
 13, PB3  F, PB3
 14, PB4  H, PB4
 15, PB5  J, PB5
 16, PB6  K, PB6
 17, PB7  L, PB7
 24, FLAG  8, PC2
 18, PC  B, FLAG2
not connected  A, GND

Circuit diagram:

[Commodore parallel cable for 1570 and 1571 drives]

You can find the description of all parts used on the diagrams at the legend page.

Source: The Joe Forster-STA homepage