Re: Null modem problems

[Jack Friess <jfriess@wctc.net>]

This is regarding the discussions about serial connections with the IIc and IIc+.  My 
comments will be regarding the IIc only because this is my recent experince (day 
before yesterday) experimenting with serial connections on the IIc.

pubpc1@library.ucla.edu wrote:

> Not exactly.  The above mentioned cable IS THE SAME as a null modem cable,
> so you do not have to add a separate null modem adapter at all.
> 
> However, the older //c does not use the same cable as a IIc+ (the IIc+ has
> the same port as the Mac while older //c computers do not).  You will need
> a "//c to ImageWriter II" cable if you have an older //c, but if you use
> such a cable, you won't need a separate null modem adapter.
> 
> Just plug the DIN 5 end into the //c and the DB-25 end into the PC and you
> will be ready.

This is not quite my experience (12/10/96).  To test our serial network connection, I 
had:

Apple IIc with printer port (Din-5/f) and modem port (Din-5/f)
IIc printer cable (Din-5/m -> DB-25/m)
IIc modem cable (Din-5/m -> DB-25/m)
null modem adapter  (DB-25/f -> DB-25/f)
gender changer  (DB-25/f -> DB-25/f)
serial cable  (DB-25/m -> DB-25/f)

The modem cable works attached to the modem port with the null modem adaptor and the 
software "driver" set to null modem (CTS/RTS).

The printer cable does not work in the modem port with any adaptor and/or software 
settings/"drivers".  (I did not try the printer port. Also, I did not independently 
test the printer cable, or try a second one, but assume it is okay since it was new 
out of the package.) 

Hope this is helpful.


Jack Friess
Stevens Point, Wisconsin, USA 


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