Re: Null Cable Modem for a IIC PLUS to a Laptop that has a serial port.

[schmidtd <schmidtd@my-deja.com>]

On Aug 2, 8:05 am, patrickdas...@cox.net wrote:
> hi .   can someone please tell me which type or style null cable
> modem ,   one would use for connecting up a Apple IIC+  to a Laptop
> which has a serial port?
>From the FAQ:
http://home.swbell.net/rubywand/Csa2T1TCOM.html#024

Best viewed with a monospace font (sorry, Googlers):

Both 9 and 25-pin numbering is shown for the PC connector end. For the
IIc plug,
DIN-5 pin numbers are listed with traditional Apple pin numbers in
parenthesis ...


  DIN-5M            Dsub9   or    Dsub25
 (Apple)            9 pins        25 pins

 4 (2) TXD     -->  2 RXD        3 RXD
 5 (4) RXD     <--  3 TXD         2 TXD
 2 (3) GND     ---  5 GND         7 GND
 1 (1) DTR     -->  6 DSR --,*    6 DSR --,*
                    1 DCD --'     8 DCD --'
 3 (5) DSR/DCD <--  4 DTR        20 DTR

* pins connected by a jumper


     Usual Apple numbering for a male cable connector (plug) as
viewed looking at the pins from the front is ...


1       5
 2     4
    3