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From: Mark.Hollingsworth@f1.n354.z1.FIDONET.ORG (Mark Hollingsworth)
Newsgroups: comp.sys.mac.hardware
Subject: Hardware Handshaking on Mac Plus
Message-ID: <348.27EE9E8E@busker.fidonet.org>
Date: 24 Mar 91 17:06:02 GMT
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Organization: FidoNet node 1:354/1 - Evergreen Micro Net, Port Angeles WA
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Seth Cohn writes;
 
>ok, HOW can you do Hardware handshaking on a mac plus?
>(or on a Classic, LC, or Si)  None of these has Pin 7
>(known as GPi or general Purpose input)  hooked up
>(apple got cheap and figured it wasn't neccessary) thus
>you can hook up hardware handshaking but you lose
>carrier detect (which is not acceptable!!!) Can you use
>pin 8 - which is the extra receive pin for carrier
>detect if the software is right???? if not, any other
>way???
 
>thanks in advance, Seth
 
 
 
If you are not running a BBS, you really don't need the
carrier dectect. If you are, then you are correct (at 
least as far as I have been able to find out) you can't
do both on the plus.
Here is the proper pin diagram for Hardware Handshake 
cable:
 
 
Mac                   DB25
 
1----------------------4
2----------------------5
3----------------------2 
4----------------------7
5----------------------3 
6-------------unconnected
7-------------      "" 
8---------------    ""
 
Hardware Handshake modem cable
 
If you are using a US Robotics HST modem,
then use the following NRam settings:
 
USRobotics Courier 14400 HST NRAM Settings...
 
   DIAL=TONE   B1  F1  M1  X7
   BAUD=38400  PARITY=N  WORDLEN=8
 
   &A3  &B1  &G0  &H1  &I0  &J0  &K3  &L0
   &M4  &N0  &P0  &R2  &S0  &X0  &Y1
 
   S02=043   S03=013   S04=010   S05=008
   S06=002   S07=060   S08=002   S09=006
   S10=007   S11=070   S12=050   S13=000
   S15=000   S19=002   S21=010   S22=017
   S23=019   S24=150   S26=000   S27=000
   S28=008   S38=000
 
 
Dip switch settings
 
1--down    2--up   3---down  4--up  5--down
6--down   7--up   8--down  9--down  10--up
 
 



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Mark Hollingsworth - via FidoNet node 1:105/14
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