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From: lma@polya.Stanford.EDU (Larry M. Augustin)
Newsgroups: comp.sys.ibm.pc
Subject: switchar in PC DOS 3.2
Message-ID: <4501@polya.Stanford.EDU>
Date: 16 Oct 88 07:59:04 GMT
Reply-To: lma@polya.Stanford.EDU (Larry M. Augustin)
Organization: Stanford University
Lines: 33

Forgive my ignorance, but I don't understand this:

  
  Yes.  If you have a copy of Zenith's PUP (Programmer's Utility Package),
  you'll see that there is a DOS call to set the switchar.  Quoting from the
  documentation:
  
  "
  55/27H--Character Operations
  (Change Incompatible Configuration)
  
  Entry:	AL	= 0	Return DL = ASCII switch character
  	AL	= 1	Set switch character to DL
  	AL	= 2	Return DL = availability byte
  	AL	= 3	Set availability byte to DL
  
  Exit:	DL	= Value if AL = 1 or 3
  
  
  The availability is 0 if devices must be prefixed with the DEV directory name.
  "

What is 55/27H?  It's not interrupt 27H, that's TSR.  The poster might
have meant DOS functional call 55H, which is "used internally by DOS."
I tried that, but it crashed my machine.  DOS function call 27H is a
random block read.  Can someone explain?

Thanks.

Larry M. Augustin			ERL 414
lma@sierra.stanford.edu			Computer Systems Lab
lma@dayton.stanford.edu			Stanford University
(415) 723-9285				Stanford, CA 94305