Re: NULL modem cable.

[kyriann@blackhole.nyu.edu (Jimmy Kyriannis)]

For some reason, I seem to recall that the pinout on the Mac serial port is
different than that of a IIgs, and possibly different vintages of Macs (Mac SE
vs. Mac G3) behave differently as well.

At any rate, according to the Apple IIgs Hardware Reference, here's the pinout
for the serial port (view with a monospaced font):

 /---V---\
| 8  7  6 |
| 5  4  3 |
 \_ 2 1 _/
   |___|

1 DTR		- Data Terminal Ready
2 HSKI		- Handshake In
3 TX DATA-	- Transmit Data-
4 GND		- Ground reference and supply
5 RX DATA-	- Receive Data-
6 TX DATA+	- Transmit Data+
7 GPI		- General Purpose Input
8 RX DATA+	- Receive Data+



Jimmy

In article <BUpn4.4831$_p2.103663@nnrp1.ptd.net>,
Andrew Rodland <arodland@ptdprolog.net> wrote:
>I tried to build myself a PC-to GS null modem cable from Radio shack, but
>radio shack and everything I could find around here didn't have mac cables.
>I now want to build my own. can anyone give me the pin connections for all
>of these wired together? instead of
>DIN-8 -> DB-25 -> null modem adaptor -> DB-25 - DB-9 convertor
>I just want the pinout for 8-pin mini-din to DB-9 serial with null modeming
>and hardware handshaking. If anyone can figure out what I'm trying to say
>here, could you please try to do this for me, as I have almost given up.
>