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 adaptor:

• One printable circuit board of about 9 x 5.5 centimeters

• One PCB-mountable 6-pin DIN female port (Commodore serial port)

• One PCB-mountable 25-pin male plug (PC parallel plug)

• Four 1N5819 or BAT85 diodes

Step 1. Build the board of the adaptor, cut it to shape and drill the holes in it, according to the board diagram (300 DPI resolution). This diagram shows the board as viewed from below.

Step 2. Solder the PCB-mountable DIN port and parallel plug onto the top side of the board.

Step 3. Build the diode bridges between onto the appropriate places on the top side of the board. 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, which corresponds with the right side when the adaptor is viewed from its back side, where the DIN port and the user port edge are.

The parts should be soldered the following way onto the board. This diagram shows the board as viewed from above. Note the small band on the right side of the diodes.

Circuit diagram

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

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