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From: jlaiho@cc.helsinki.fi (Trucker)
Newsgroups: comp.os.cpm
Subject: Re: Vector 4 Modem problems: The saga continues
Message-ID: <3085@cc.helsinki.fi>
Date: 22 Mar 89 09:29:50 GMT
References: <8903152308.AA08503@ucbvax.Berkeley.EDU>
Lines: 25

In article <8903152308.AA08503@ucbvax.Berkeley.EDU>, xd2w@VM.CC.PURDUE.EDU (Bruce Ide) writes:

[Some lines deleted]

> mdm700 too). A consultant here thinks maybe my RS232 read/send pins are
> in the wrong order. Could this be causing my problem? I know the modem
> works because I tested it on an IBM PC. I have three hypotheses right
> now: 1) My computer was damaged in the mail, 2) Got the wrong port or
> software, 3) The RS232 pins are in the wrong order. Now, if my computer
> was damaged, the self test that it goes through before booting should
> tell me. Would either of the other two be causing my problem?

About the serial ports in Vector 4:
  Serial printer port and serial comm. port are made of exactly the same
hardware, only the pins 2 and 3 (xmit and receive) are in different
order.
  So, in order to use a modem via the serial printer port you must make a
cable (or adapter) with wires 2 and 3 crossed. Then you must modificate
your terminal program's port definitions (I hope you have the source!)
so that instead of reading/writing via the serial comm. the terminal
program reads&writes via the serial printer port.

Juha Laiho
jlaiho@cc.Helsinki.FI  (The Internet)
jlaiho@finuh.bitnet