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From: jra@BRL.MIL ("John R. Anderson", VLD/ASB)
Newsgroups: comp.sys.sgi
Subject: Setmonitor
Message-ID: <9003191351.aa07487@VAT.BRL.MIL>
Date: 19 Mar 90 18:51:15 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 33


	I am trying to use the "setmonitor" routine to switch our 4D to
30 Hz, sync on green mode while I grab the video with another device.
I wrote a very simple program to attempt this:

	#include <gl/gl.h>
	#include <gl/get.h>


	main()
	{
		short mtype;
		int ch;

		mtype = HZ30_SG;
		setmonitor( mtype );	/* switch to 30 Hz */

		while( (ch=getchar()) != '\n' ); /* wait for a CR */

		mtype = HZ60;
		setmonitor( mtype );	/* switch back to normal */
	}



It compiles nicely, but upon execution I get an "invalid argument" error
message from both "setmonitor" calls.  Anyone run into this before?? Any
ideas on why this desn't work??



				Thanks,
				-John