The program requires the following adapter cable to be connected between your
parallel printer port (LPT1/LPT2/LPT3) and a commodore disk drive (1541/1581)

IBM LPT port Male (solder side):     CBM IEC serial port Male (solder side):
        �����Ŀ                              �����_���ͻ
Strobe����1�  ���Ŀ                        �ͼ         �ͻ  _____
        �      �14���AutoFeed        Data������5     1������SrqIn  _____
(Data 0)� 2�Ŀ    �                        �     6�����������������Reset
        �    ���15�(Error)          Clock������4     2�����ĿGround
        � 3�      �  ____                  �ͻ   3�    �ͼ ���
        �      �16���Init                    ���������ͼ
        � 4�      �                           Atn��
        �      �17���SelectIn  �������������������������������������������Ŀ
        � 5�      �            � C64signal �  IBMsignal       LPT port + 2 �
        �     ��18�            �           �                               �
        � 6�  ������ĿGround   �  2 Ground � 18..25 Ground                 �
        �     ��19� ���        �  3 Atn    �      1 Strobe      bit 0      �
        � 7�  �   �            �  4 Clock  �     14 AutoFeed    bit 1      �
        �����������            �  5 Data   �     17 SelectIn    bit 3      �
        �     ��25�            �  6 Reset  �     16 Init        bit 2      �
        �13�  �����            ���������������������������������������������
        �������

It is not necessary to wire all the ground pins.

The connection between the pins 2 and 15 on the LPT port side is necessary for
the auto detect routine. If you don't want to connect it, you can, but you must
force the program to work with the LPT port where the cable is connected.