You should follow these instructions if your drive has no parallel capabilities yet and you want to connect the cable directly onto the periphery chip in the drive. If possible, you shouldn't use this method because, this way, you won't be able to make use of it with a Commodore machine.

Important notes

• On circuit diagrams, plugs are displayed as viewed from the back side, the solder side. Chips are displayed as viewed from above; also, see the small semicircular cut for finding the correct orientation. When in doubt, see the corresponding description on the legend page.

Construction

You need the following parts to build this cable:

• One solderable 25-pin male plug (PC parallel plug)

• Eight diodes (e.g. 1N4148)

• A shielded or unshielded 8-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 those wires, that don't go through a diode, on the other end of the cable onto the parallel plug. These include the following connections:

      CIA      
 Parallel plug 

    10, PB0    
   13, Select  

    11, PB1    
   12, PaperEnd

    12, PB2    
   10, Ack     

    13, PB3    
   11, Busy    

 not connected 
18-25, GND     

Step 3. Solder the remaining wires through a diode onto the parallel plug. These including the following connections:

      CIA      
 Parallel plug 

    14, PB4    
    6, Data 4  

    15, PB5    
    7, Data 5  

    16, PB6    
    8, Data 6  

    17, PB7    
    9, Data 7  

The cathodes of the diodes should be pointing towards the pins in the right column of the table.

Step 4. Build the diode bridges between the appropriate pins of the parallel plug. These include the following connections:

 Parallel plug 
 Parallel plug 

   10, Ack     
    4, Data 2  

   11, Busy    
    5, Data 3  

   12, PaperEnd
    3, Data 1  

   13, Select  
    2, Data 0  

The cathodes should be pointing towards the pins in the right column of the table.

Circuit diagram

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

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