
Serial Ports C-1
Appendix C
The Serial Port
Figure C-1. Location of the Serial Port.
Choosing a Serial Cable
Obtain a serial cable. Use the chart below to determine what type of
cable to purchase:
If you have a serial connector
in the back of your computer
that looks like this
You need to purchase this type
of shielded serial connector
DB-25 female connector to DB-
25 female connector
DB-25 female connector to DB-9
female connector
Notes for Macintosh Users
For top performance, your serial port should support speeds of 115.2
kbps. Most Macintosh serial ports support 57.6 kbps. To make your
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