The XAP1541 adaptor

Important notes

• You definitely need BSV52 transistors and 4.7 kOhm resistors for this cable, different parts may make the cable inoperable.

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 BSV52 transistors
• Four SMD 1206-style 4.7 kOhm resistors

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. (Board diagram coming later...)

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

Step 3. Build the enhancer bridges, consisting of one transistor and one resistor each, onto the appropriate places. These include the following connections:

The collector of the transistor should be pointing towards the pins in the left column of the table. The base of the transistor should be pointing towards the pins in the right column of the table; this is also the place for the resistor. The emitter of the transistor should be connected to the common ground of the adaptor.

The parts should be soldered the following way onto the board. This diagram shows the board as viewed from above. (Part diagram coming later...)

Circuit diagram:

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

Source: The Joe Forster-STA homepage

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