Apple II Duo Disk Cable

Many people over the past few years have been searching for the ever elusive DuoDisk Cable.  Unfortunately, the longer we go in time from actual sale of the cable, the further between the sales of them on Ebay are.

But now, thanks to Herb Johnson, we now have a great pinout chart of the cable which is as follows:

DB25 male DB19 male
2    1
3    18
4    2
5    15
6    19
7    6
8    9
9,21    3
10,14    4
11    17
12    10
15    11
16    12
17    13
18    14
19    7
20    8
23    5
24    16

The pinout and other information can be found on his website at

Keep in mind that the 19 pin connectors are not very readily available so you will have to actually have to search for them but the reality is that this can be built into a single adapter and you can use a straight through 25 pin serial cable for the this.

If you do attempt to build this adapter, take your time and do it right.  it will make the actual adapter look much better.

Please follow and like us:

About the Author

Bill Martens

A.P.P.L.E. Chairman of the Board and Club president -- Bill worked for the founder, Val J. Golding and A.P.P.L.E. from 1981 to 1982. In 1999, he began archiving the materials which were distributed and sold by A.P.P.L.E.. That project led to the group that remained of A.P.P.L.E. Bill was involved in the financial industry in Tokyo and has over 20 major office infrastructure projects to his name. In March 2001, he retired to write books and to spend more time pursuing personal interests. As the president of the users group, Bill is in charge of distribution of Call-A.P.P.L.E. magazine as well as the organization of this web site. Bill currently resides in Tokyo, Japan and Shelton, Wa splitting time between the places.