Macintosh: Mini DIN-8 to DB-9 Adapter Pinouts (10/94)


This adapter cable is used to connect DB-9 cables to devices with Mini
DIN-8 ports (such as on the Macintosh Plus or newer).

This article has been archived and is no longer updated by Apple.
Circular 8 Signal DB-9
1 HSKo (+12V) 6
2 HSKi 7
3 TXD- 5
4 GND 3,1*
5 RXD- 9
6 TXD+ 4
7 No Wire
8 RXD+ 8

* Pins 1 and 3 on the DB-9 end are jumpered together.

The pins on the male end of the circular 8 connector are numbered as shown:

6 7 8
3 4 5
1 2

NOTE: The Macintosh Plus peripheral adapter cable is stamped with the
number 590-0341; when reordering, however, be sure to use the cable's
service part number, which is 699-0430 (older cables may be referred
to as 699-0372).


Article Change History:
12 Oct 1994 - Reviewed for technical accuracy.

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Published Date: Feb 19, 2012