Compaq 1610 Reference Manual page 25

Once Windows CE Services is installed on your computer and the
communications port is configured, you are ready to connect your
handheld PC to the computer. To do so, follow the steps below.
1. Connect the 16-pin end of the auto-sync cable to the serial
connector on your handheld PC
2. Connect the 9-pin end of the auto-sync cable to the serial
connector on your computer
a 9-to-25 pin adapter in order to connect the auto-sync cable).
The first time you connect your handheld PC to the
computer, the New Partnership Wizard appears on the screen.
Follow the instructions to establish a connection between the two
devices. The next time you connect, your data will be
synchronized automatically, provided that you accept the default
settings.
Refer to The Handheld PC Companion for more
information on establishing a connection and synchronizing data.
.
. (Some computers may require