Re: IIGS -> laser 4MP printer

[dempson@atlantis.actrix.gen.nz (David Empson)]

In article <3fvq8v$bf1@crl8.crl.com>, Matthew Pearce <mpearce@crl.com> wrote:
> A friend just purchased a 4MP (HP?) laser printer for her IIGS.  Does
> anyone know the pinout of the GS printer port, or what cable she should
> use?

I haven't seen a 4MP up close, but if it has the same connector as a
4M, the cable you need is the same one that is used to connect a
Macintosh or IIgs to a serial printer such as an ImageWriter I.

If you can't find a cable, the pinout of the connector is as follows
(looking at the back of the IIgs):

  8  7  6
  5  4  3
    2  1

The pin functions are:

1  Handshake Out
2  Handshake In
3  Transmit Data (-)
4  Ground
5  Receive Data (-)
6  Transmit Data (+): not used for an RS-232 device
7  General Purpose Input: not used for a printer
8  Receive Data (+): connect to Ground for an RS-232 device

The cable pinout would be as follows:

IIgs    Printer

1       6 (DSR)  [probably; not essential for a printer]
2       20 (DTR)
3       3 (RxD)
4       7 (Signal Ground)
5       2 (TxD)
6       No connection
7       No connection
8       Connect to pin 4 at the IIgs end, or pin 7 at the printer end

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand