Important notes

• You definitely need 1N5819 or BAT85 for this cable, other Schottky-diodes or the usual 1N4148 diodes don't work with many motherboards.

• 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 6-pin male DIN plug (Commodore serial plug)

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

• Four 1N5819 or BAT85 diodes

• A shielded 4-wire or unshielded 5-wire cable of, preferably, at most 2 meters

Step 1. Solder one end of the cable onto the DIN plug.

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:

   DIN plug   
 Parallel plug 

    2, GND     
18-25, GND     

    3, ATN     
   13, Select  

    4, CLK     
   12, PaperEnd

    5, DATA    
   11, Busy    

    6, RESET   
   10, Ack     

Step 3. Build the diode bridges between the appropriate pins of the parallel plug. These include the following connections:

 Parallel plug 
 Parallel plug 

   13, Select  
    1, Strobe  

   12, PaperEnd
   14, AutoFeed

   11, Busy    
   17, SelectIn

   10, Ack     
   16, Init    

The cathodes of the diodes 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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