[comp.sys.apple2] Modem cable for //c?

thomas@duteca (Thomas Okken) (12/28/90)

I have an Apple //c and a Hayes-compatible 2400 baud modem, and I'd like the
two to talk to one another. I have constructed a cable with the following
connections:

//c      modem

DTR1B    DTR
TD1B     Transmit
GND      Common Return
RD1B     Receive
DSR1B    DSR

After configuring the modem port for 2400 baud etc (all conforming to the
modem's default settings) and entering terminal mode with IN#2, ctrl-A, T,
I can talk to the modem just fine - my commands are echoed, I can view and
change settings, etc.
Now I call my host at the university, everything goes fine up to the
"CONNECT 2400" message and the login prompt, and then I'm stuck: nothing
I type seems to get sent to the host. To summarize: I can send and receive
to the modem, but the modem does not send to the host, though it does receive.

I use this same modem, connected to a Mac II with a three-wire connection,
without any problems, so I tried disconnecting the handshake lines in the
//c-modem cable. Alas, same result.

What am I doing wrong? Any help will be greatly appreciated!
Please e-mail responses. Thanks!

Thomas (thomas@duteca.et.tudelft.nl)