Re: Apple IIC 2 PC Help!!!

[noone@nowhere.net]

Leonard:
Your cable may work as wired if you cross pins 7 & 8 of the PC side. 
You are missing the additional handshaking signals that need to be
present (RTS/CTS) for hardware handshaking on the PC side that telecom
software needs.  Try this before reading on.


I made a handshaking modem cable for the IIc years back.  IIRC, when I
ran into the missing signals, I wired the DTR/DSR of the IIc into
RTS/CTS of the modem and then shorted the DTR/DSR/CD on the modem side. 
This worked pretty slick for my friend.  She used a 14.4 modem with this
cable for quite some time.

If shorting 7 & 8 does not work, try this cable instead, it consists of
the modem cable I made long ago and a standard Null modem cable into one
wiring diagram.
Apple 5 Pin      PC 9 Pin
Pin 1 DTR ------ Pin 8 CTS
Pin 2 TD ------- Pin 2 RD
Pin 3 GND ------ Pin 5 GND
Pin 4 RD ------- Pin 3 TX
Pin 5 DSR ------ Pin 7 RTS
                 Pins 1 CD,4 DTR,6 DSR Shorted

The easiest ADT connection I have ever made was shorting pins 1 & 5 of
the IIc, hooking up TX, RX and Gnd (crossed) to the PC and shorted 7 &
8, then 1, 4 & 6.  This fooled all the signals and let it freewheel at
9600 baud.  Generally speaking, nothing is so slow that it can't keep up
with 9600 baud so i never ran into issues.  I tried this just to see if
it could be done, and it can.

If you have any problems following this, contact me off list and I'll
see what I can do.  (I own my own break-out box which makes this so much
easier.)

Thankx,
Ed
delfsNO@SPAMapple2.com

Leonard wrote:
> Ok, I went on some of the apple sites and got the pin outs for a null
> modem cable.  I carefully made one up.  I checked and rechecked the
> wiring.  It checks ok.  This is how I wired it:
>         Apple 5 Pin                          PC 9 Pin
>          Pin 1 DTR -------------------------> Pin 6 DSR
>          Pin 2 TD --------------------------> Pin 2 RD
>          Pin 3 GND -------------------------> Pin 5 GND
>          Pin 4 RD --------------------------> Pin 3 TX
>          Pin 5 DSR -------------------------> Pin 4 DTR
> In addition I shorted pins 1 & 6 together on the pc side.