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From: stevens@hsi.UUCP (Richard Stevens)
Newsgroups: comp.sys.att
Subject: UNIX PC - wrastop() question
Message-ID: <715@hsi.UUCP>
Date: Tue, 10-Nov-87 21:02:49 EST
Article-I.D.: hsi.715
Posted: Tue Nov 10 21:02:49 1987
Date-Received: Fri, 13-Nov-87 03:19:11 EST
Organization: Health Systems Intl., New Haven, CT
Lines: 18
Keywords: wrastop, 3b1

The following code is from the etch-a-sketch program from
The Store.  Basically the program keeps a bit map in memory,
writing to the screen as necessary.  The comment on the declaration
for bmdumb[] puzzles me - is this extrnaeous array allocated
space to correct some early problem with the wrastop() operation
on the UNIX PC ??  Only the first 2 arrays are needed, so I'd
guess the extra one is a workaround for some bug ??

 unsigned short bitmap[WINHEIGHT][WINSWIDTH];
 unsigned short bmsave[WINHEIGHT][WINSWIDTH];
 unsigned short bmdumb[WINHEIGHT][WINSWIDTH]; /*Without this rubber() fails */

If this is so, anyone know if the bug has been fixed, now that
the system is over 2 years old ??

	Richard Stevens
	Health Systems International, New Haven, CT
           { uunet | ihnp4 } ! hsi ! stevens