Is it possible to receive data on a //c's printer port?

[Ivan X <ivan@ivanx.com>]

I have recently acquired my first //c (it's a third revision, "memory expansion" model), and have only recently started using the IIc Plus I got last year.

I'd like to use both of the serial ports for general communication -- one for ADTPro/VSDRIVE, and one for ProTERM. But if I tell ADTPro to use slot 1, there's no activity.

I tried to use IN#1, but was surprised to discover the easter egg that you'd get with IN#5 on the earlier revisions (if you type 10 IN#1 : INPUT A$: PRINT A$ you get the names of four people). It won't accept ctrl-A or ctrl-I to change the serial parameters. This is true on both machines. This seems pretty odd to me unless Apple really intended the printer port for output only.

(Also, I can't use IN#2 on my IIc Plus -- it freezes -- until it warms up for a few minutes. I suspect that's my particular unit.)

So: does anyone know if it's actually possible to do modem (bidirectional) communiation on a //c printer port?