accessory unit

[sales@mainlinebbs.com (John H. Guillory)]

I have a card for the Apple II, which was given to me in a box labeled
"accessory unit" for use with apple II computer, model 7710-02
asynchronous serial interface.  Made by California Computer Systems.
Would anyone happen to know what the dip-switch settings is for this
card?  Also, would you use it the same basic way as the Apple IIGS's
serial port, in that you just use PR#2 to print to the serial port,
and IN#2 , assuming it was plugged into slot 2...