Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!dimacs.rutgers.edu!rutgers!cbmvax!ken
From: ken@cbmvax.commodore.com (Ken Farinsky - CATS)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: <None>
Message-ID: <22165@cbmvax.commodore.com>
Date: 4 Jun 91 20:39:48 GMT
References: <1991Jun3.221411.3198@coral.bucknell.edu>
Reply-To: ken@cbmvax.commodore.com (Ken Farinsky - CATS)
Organization: Commodore, West Chester, PA
Lines: 71

In article <1991Jun3.221411.3198@coral.bucknell.edu> hollnbgh@coral.bucknell.edu writes:
>There are several things I would like to know about the A2024 monitor:
>
>The resolution is 1008 x 800 (2 bitplanes), but is the A2024 in Europe
>a PAL monitor with 1008 x 1024 ?

Yes, NTSC 2024 (60Hz) = 1008 x 800; PAL 2024 (50Hz) = 1008 x 1024.

>It is the same as a Moniterm Viking I monitor (in the way the system
>drives the video)?

Yes, the moniterm and the 2024 are the same thing, one has the decoding
stuff in the monitor and one requires a video card.  The tube size
is different as well.

>Assuming that someone has a A2024 (or a Moniterm) with 1.3, how does a
>C programmer get a 1008 x 800 screen open.  I vaugely remember something
>about Intuition.library V35 being the version that would allow the A2024
>to operate.  What flags go into the new_screen.Flags field?

You must use tags to do this.  Under V35 you can set the NS_EXTENDED bit
and call OpenScreen().  For V36 and later you can call OpenScreenTags()
or OpenScreenTagList().

It looks like you need to set (in addition to the regular stuff):

	#include <graphics/view.h>
	#include <intuition/screens.h>

	/* struct ExtNewScreen is struct NewScreen with the
	** following field added to the end:
	**
	**     struct TagItem *Extension;
	*/
	struct ExtNewScreen newscreen;

	/* this tag must be first for V35 compatibility. */
	taglist[0].ti_Tag  = NSTAG_EXT_VPMODE;
	taglist[0].ti_Data = VPF_A2024 | VPF_TENHZ; /* or just VPF_A2024 */

	taglist[1].ti_Tag  = TAG_END;

	if (GfxBase->LibNode.lib_Version <= 34)
	    ; /* can't do tags or moniterm */
	else if (GfxBase->LibNode.lib_Version == 35)
	    {
	    newscreen.extension = taglist;
	    newscreen.Type = CUSTOMSCREEN | NS_EXTENDED;
	    newscreen.ViewModes = 0; /* for 2024 */
	    newscreen.Width = 1008;
	    newscreen.Height = 800;
	    if (GfxBase->DisplayFlags & PAL)
		newscreen.Height = 1024;

	    if (NULL != (screen = OpenScreen(&newscreen)))
		{
		/* succeeded! */
		}
	    }
	else if (GfxBase->LibNode.lib_Version >= 36)
	    ; /* see AmigaMail article, described below. */

>How do I open the 1008 x 800 screen under 2.0 ?

Same way, but you must check the display database to see if the mode
is available.  See AmigaMail article by Ewout Walraven, Jan/Feb 1991.
-- 
--
Ken Farinsky - CATS - (215) 431-9421 - Commodore Business Machines
uucp: ken@cbmvax.commodore.com   or  ...{uunet,rutgers}!cbmvax!ken
bix:  kfarinsky