Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!mike
From: mike@lll-lcc.aRpA (Mike Hummell)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Wrap plug pin-out needed
Message-ID: <1631@lll-lcc.aRpA>
Date: 28 Apr 88 06:21:34 GMT
References: <302@conexch.UUCP>
Organization: Lawrence Livermore Labs, Livermore Ca
Lines: 30
Keywords: IBM-PC serial parallel port diagnostic hardware
Summary: found in AST manual

In article <302@conexch.UUCP>, root@conexch.UUCP (Larry Dighera) writes:
> Does anyone know how to wire wrap plugs for testing the RS232 and parallel
> ports on IBM-PC systems?  Any and all pointers to sources of this information
> or diagrams greatly appreciated.  
 
From AST Research's  "SixPakPlus" User's Manual, ver 1.0, June, 1983 
under Section 3.4 (Diagnostic Testing of the Serial Port):
  "to build this wrap plug, you will need a female DB25 connector,
   such as a Winchester Electronics P/N 49-1125S.  Jumper together 
   the following pins on the connector:

       Pin  2 to Pin  3       (TX to RX)
       Pin  4 to Pin  5 & 22  (RTS to CTS & RI)
       Pin 20 to Pins 6 &  8  (DTR to DSR & DCD)

   Certain versions of the IBM diagnostics may fail on the first pass.  
   You should therefore ignore the results of the first pass if an error
   occurs."

I myself have not tried this since I have a wrap plug (loop back module)
which I bought from:
      SYZYGY  256 West San Bernardino Road   Covina,Ca. 91723
      (213)332-3320.    Part # LB25B

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