Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!motcsd!hpda!hpcupt1!andrews
From: andrews@hpcupt1.HP.COM (Edward E. Andrews)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Help from TSR Gurus requested
Message-ID: <-286529997@hpcupt1.HP.COM>
Date: 19 Jul 89 19:00:18 GMT
References: <536@cybaswan.UUCP>
Organization: Hewlett Packard, Cupertino
Lines: 18

Your TSR should use it's own PSP if:

	1) You want to use your own ^C handler,
	2) You want to use your own critical error handler, or
	3) You want to do file I/O with handles.
	4) You want to do any DOS functions (i.e. INT 21h)

To get the current PSP:
	mov	ah,51h
	int	21h
	mov	OldPSP,bx

To set the current PSP:
	mov	ah,50h
	mov	bx,NewPSP
	int	21h	

Enjoy!