Re: NEED: Pinouts for Apple IIGS serial printer port (DIN8)

[nathan@visi.com (Nathan Mates)]

In article <01bc283e$2123a9c0$89eaa3c6@bean.escape.ca>,
RaceFace <bean@escape.ca> wrote:
>I need the pinouts for the Apple IIGS mini-DIN8 printer connector, and what
>pins to connect on a DB25.  I need to make a cable for it.

   Tip: comp.sys.apple2.marketplace, where you posted, is for buying
and selling Apple II products. The far more appropriate place to ask
general questions is comp.sys.apple2. This thread has been redirected
there.

   For general Apple II questions, you should consult the
comp.sys.apple2 Frequently Asked Questions (FAQ) at
http://www.visi.com/~nathan/a2/faq/csa2.html as it contains the
answers to lots of general questions, such as this one. I quote
from the pinouts page at http://www.visi.com/~nathan/a2/faq/pinouts.html 

--- Clip

                        Pinouts for Apple II Connectors
                                       
    Disclaimer: I haven't verified these, but they did appear to be posted by
    reliable people.
    
   This web page lists a lot of Apple II related pinouts, the following
   categorized table of contents should make finding things easier than
   before.
   
     * Power connectors
          + GS Motherboard power connector
          + Apple //c Power Connector
     * Serial, Parallel connectors
          + GS, Macintosh & //c+ serial ports
          + //c serial port pinouts
          + Parallel printer DB-25 cable
          + IIc+ internal modem connector
          + non-Apple DB9 and DB25 serial ports
     * Video connectors
         
  Mini DIN-8 serial port (GS, IIc+, Macintosh)
  
   [And pinouts to connect to a serial DB-25 printer]
The IIgs serial port is numbered as follows, looking at the back of the
computer:

8 7 6
5 4 3
 2 1

The wiring for a serial printer cable (==modem cable) would be as follows:

IIgs                 Printer (DB-25)

1  Hshk Out   -----  6 DSR  (or possibly 5 CTS, or 8 DCD)
2  HShk In    -----  20 DTR (or possibly 4 RTS)
3  TxD-       -----  3 RxD
4  Gnd        -----  7 Signal Ground
5  RxD-       -----  2 TxD
6  TxD+  No connection
7  GPI   No connection
8  RxD+  Loop to signal ground (pin 4 at IIgs or pin 7 at printer)

(Cable shield should be connected to shielding at the IIgs end, and to
pin 1 at the printer end.)


By comparison, a modem cable will swap pins 1 and 2, and pins 3 and 5
(using the numbering of the IIgs end).

--- End clipping

--
<*> Nathan Mates http://www.visi.com/~nathan/      <*>
# What are the facts? Again and again and again-- what are the _facts_?
# Shun wishful thinking, avoid opinion, care not what the neighbors
# think-- what are the facts, and to how many decimal places?  -R.A. Heinlein