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From: kevinp@mmintl.UUCP (Kevin Piette)
Newsgroups: net.micro.pc
Subject: Re: Using AT remotely.
Message-ID: <354@mmintl.UUCP>
Date: Mon, 29-Apr-85 18:49:16 EDT
Article-I.D.: mmintl.354
Posted: Mon Apr 29 18:49:16 1985
Date-Received: Wed, 1-May-85 06:02:18 EDT
References: <903@ucbtopaz.CC.Berkeley.ARPA>
Organization: Multimate International, E. Hartford, CT
Lines: 37

>I am used to using an XT.  We want to use an AT remotely, using a standard
>terminal (like a Televideo 925).
>
>0.  Do I have to buy any special hardware to hook a terminal into the AT?
>Or, can I just plug it in?

The only hardware you need for connection is an adapter cable which
provides a typical DB25 interface to the 9-pin serial connector on the
IBM PC/AT.  This adapter is available from an IBM PC product retailer
or easily constructed from parts available at an electronic supply
house.  If interested in constructing your own, contact me and I will
provide the wiring diagram for the 9-pin on the PC/AT as well as the
corresponding DB25 pin numbers for a DTE configuration.  (You will
probably need to swap a few lines for a DCE configuration to attach to
the TVI-925).

>1.  Will I have the same problem (as I do on the XT) with programs that 
>always write to the monitor, and not out the serial port?  Specifically,
>I am most interested in using symphony.

Yes you will.  The 'CTTY' command of PC-DOS can only re-direct the DOS
level I/O calls for the keyboard and display.  Applications which write
directly to the video RAM can not be re-directed using this technique.
This Unfortunately includes most IBM-PC display intensive applications.

>2.  Any other useful advice?

Well, if you're into low-level hacking, you could write an assembler
process to transmit the contents of the screen buffer to the serial
port upon receipt of a command.  This could in many ways resemble the
print-screen procedure which is listed in the BIOS listings of the IBM
PC Technical Reference.  However this would not provide the 'real-time'
interactiveness I believe you are looking for.
-- 
Kevin Piette					Phone: (203) 522-2116
Multimate International Corporation, Research & Development
UUCP: ...!seismo!cmcl2!philabs!pwa-b!mmintl!kevinp