Circuit diagram legend

The following electronical parts are used in the cables and adaptors discussed on these pages:

Description	Graphical representation
Wire.
Ground wire. If you have a shielded cable then use the shielding for the line marked as "GND" on the diagrams.
Not connected wires. Note the small split in the horizontal wire.
Connected wires. Note the small dot, representing the solder blob.
Diodes. Their cathode end is marked with a small band, which corresponds to the direction the "arrow", representing a diode in the circuit diagram, points to (on this picture, the right side). In all tables, the right column shows the pin the cathode should point to.
CIA periphery chip. It has the type number 6526, 8520 or 8521 printed on it. It is displayed on the diagrams as viewed from above. The small semicircular cut on the chip may help you with finding the correct orientation.
DIN plug. It is displayed on the diagram as viewed from the back side, the solder side. On some DIN plugs, the pins are marked with small numbers.
DIN port. It is displayed on the diagram as viewed from the back side of the Commodore drive or the adaptor.
Enhancer. It consists of one transistor and one resistor. The transistor has three pins. The collector (marked with C) should be connected to the wire coming from the Commodore end of the cable. The base (marked with B) should be connected to the wire coming from the PC end of the cable. Also, this is the place to insert the resistor to. The emitter (marked with E) should be grounded. The first picture shows the enhancer. The second picture displays a BSV52 transistor as viewed from above. The third picture displays a 2N3904 transistor as viewed from below, where its pins are. Note that the pin layouts are specific to the transistors; others may have their pins laid out differently.
Game plug. It is displayed on the diagrams as viewed from the back side, the solder side. On some game plugs, the pins are marked with small numbers.
Game port. It is displayed on the diagrams as viewed from the back side, the solder side. On some game ports, the pins are marked with small numbers.
Mini-DIN plug. It is displayed on the diagram as viewed from the back side, the solder side. On some mini-DIN plugs, the pins are marked with small numbers.
Parallel plug. It is displayed on the diagrams as viewed from the back side, the solder side. On some parallel plugs, the pins are marked with small numbers.
User port edge. It is displayed on the diagrams as viewed from the back side of the Commodore machine or the adaptor.
User port plug. It is displayed on the diagrams as viewed from the back side, the solder side. On some user port plugs, the pins are marked with small numbers, from 1 to 12; there's a letter "B" the left end of the upper row, which corresponds to pins 1-12, and a letter "A" on the left end of the lower row, which corresponds to pins A-N.
VIA#1 periphery chip. This chip has the type number 6522 printed on it and none of its pins 2-9 are connected to any other chip. The VIA is displayed on the diagrams as viewed from above. The small semicircular cut on the chip may help you with finding the correct orientation.
XA1541 mini-adaptor port. The 5-pin edge on the rear of the XA1541 mini-adaptor. The port is displayed on the diagrams as viewed from the rear of the adaptor.

Source: The Joe Forster-STA homepage

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