Print-Handler.c v1.1, 30 September 1989

This  printer  device handler implements the single sheet support
and data-spooling facility the usual PRT:  device does not have.

Each time a page has been successfully transferred to the printer
and  single paper sheets are selected in Preferences, a requestor
pops  up  on  the Workbench screen telling the user to insert the
next  sheet  of  paper.   If a process addresses this handler via
Open()  and  Write()s  data  to it, the incoming text is buffered
until the data stream is Close()d.  After that the buffer sent to
the  printer  device and finally gets discarded.  Note that there
will  be  a buffer for each calling process (up to twenty callers
are  allowed),  so  you may get low on memory.  This handler will
notice low memory situations and return a write error in critical
situations.   This handler does no first-in-first-out or last-in-
first-out data stack handling, the first data to come out is from
the first buffer to be closed

Don't  be  confused if the requestor pops up while the printer is
still  working.  Since most printers have a write buffer of their
own true synchronous printer I/O is almost impossible.

Installation is as follows:

	Add the following lines to your DEVS:Mountlist

	   PRT:	Handler		= L:Print-Handler
	   	Stacksize	= 3000
	   	Priority	= 5
	   	GlobVec		= 1
	   #

	Add the following lines to your S:Startup-Sequence

	   Assign PRT: Remove
	   Mount PRT:

	Copy Print-Handler to your L:

Skeleton handler code by Phillip Lindsay (C) 1986 Commodore
You may freely distribute this source and use it for Amiga Development,
as long as the Copyright notice is left intact.

Print-Handler (C) Copyright 1989 by Olaf Barthel & ED Hannover

Contact:	Olaf Barthel, Electronic Design Hannover
 		Brabeckstrasse 35
 		D-3000 Hannover 71
 		Federal Republic of Germany