Or make your own for about $5 in parts. All you need is a one half of a black Atari SIO cable (with the 13-pin connector on
one end, bare wires on the other), a DB-25 male connector, and a 4.7K pull up resistor. Of course, a soldering iron and
experience with soldering also helps.

The PC Xformer cable pinout is slightly different from the ST Xformer cable pinout. This was due to the fact that pin 1 on the
Centronics port behaves differently on the ST and PC. For that we added a pull up resistor on pin 11. The modified cable is
compatible with the ST, so one cable can work with both PC Xformer and ST Xformer.

DB-25 pin numbers are pretty standard. Data output pins are pins 2 through 9, and the printer busy pin is pin 11. Ground is pin
18. On the Atari side, I'm going by the pin numbers published in the Atari Technical Reference Manual. The pins are as follows:

                                          pin 2 - clock out
                                           pin 3 - data in
                                           pin 4 - ground
                                          pin 5 - data out
                                          pin 7 - command
                                          pin 10 - +5 volts

Ok, now the old ST Xformer cable pinout goes like this (Atari DB-13 pins on the left, DB-25 on the right):

                                       pin 2 - clock out - pin 3
                                        pin 3 - data in - pin 11
                                        pin 4 - ground - pin 18
                                        pin 5 - data out - pin 5
                                       pin 7 - command - pin 7
                                       pin 10 - +5 volts - pin 1

For the new PC Xformer cable, you move the +5V line from pin 1 on the DB-25 to any of the unused data output pins (2, 4,
6, 8 or 9). I chose pin 9 just to keep the spacing of the wires 2 pins apart. Then run the 4.7K pull up resistor from the data in
pin (pin 11) to any of the unused data out pins. I chose pin 2 which gives you lots of room for the resistor. The new pinout is:

                                       pin 2 - clock out - pin 3
                                        pin 3 - data in - pin 11
                                        pin 4 - ground - pin 18
                                        pin 5 - data out - pin 5
                                       pin 7 - command - pin 7
                                       pin 10 - +5 volts - pin 9

Place the 4.7K pull up resistor between pins 2 and 11 on the DB-25. That's it! You now have a Xformer Cable.