AGA <> Monitor answers

AGA <> Monitor answers

Post by M.S. Asht » Fri, 13 Nov 1992 04:36:23



After deciding to buy a 1200 myself I have done much research into this:

This is what I have discovered:
If there any ANY errors in these statements I request a Commodore engineer
to correct me.

1084: Displays all the Modes it can with ECS (max. 1280*256 non interlaced
                                                   1280*512 interlaced)
No productivity - no flicker free higher resolutions.

VGA: Same as SVGA below but is doesn't have same pixel accuracy as dot
     pitch <.28
SVGA: Displays all amiga Hi-Res modes.
      This consists of 640*512(ni) 1280*512(ni) 640*1024(i) 800*600(i?)
      These monitors are keyed to these resolutions and cannot handle Lo-res
      modes (320*256,320*512(i),640*256... etc,etc)
      If you are using the system for prof. work(i.e. Prefs/screenmode is
      available) then you may use Mode Promotion.
      This turns the lo-res modes into Hi-res by sending each line twice.
      This allows SVGA monitors to display ALL amiga resolutions*
      Bootable games will kick the Chipset into Lo-res so you cannot use
      these on your SVGA.
      So no good for games,perfect for WB.
Multiscan: Very dangerous to leap out and buy one as you don't know it's range
           of speeds...
1935: Is an SVGA.
1960: A multiscan with exactly the correct range for all resolutions*
      enables you to use Lo-res without mode promotion saving Chip bus time.
      (the image will look less 'smooth' however).
      Bootable games will work fine.

The 1960 is an excellent but expensive solution.....
If you have a television why not play the lo-res games on that(they don't
lose *that* much) and buy an 1935.
If you really want old 32-colour 320*200/256 games to be displayed pixel
perfect then buy a 1960.
I'll be buying a 1960 'cos I haven't got a T.V. :-)
Hope this helps:
If I'm wrong please correct me (if you *know* like Dr. Kitte might).
Mike.
___

 
 
 

AGA <> Monitor answers

Post by Neal Wickh » Fri, 13 Nov 1992 12:29:11



>1084: Displays all the Modes it can with ECS (max. 1280*256 non interlaced
>                                               1280*512 interlaced)
>No productivity - no flicker free higher resolutions.

>VGA: Same as SVGA below but is doesn't have same pixel accuracy as dot
>     pitch <.28
>SVGA: Displays all amiga Hi-Res modes.
>      This consists of 640*512(ni) 1280*512(ni) 640*1024(i) 800*600(i?)
>      These monitors are keyed to these resolutions and cannot handle Lo-res
>      modes (320*256,320*512(i),640*256... etc,etc)
>      If you are using the system for prof. work(i.e. Prefs/screenmode is
>      available) then you may use Mode Promotion.
>      This turns the lo-res modes into Hi-res by sending each line twice.
>      This allows SVGA monitors to display ALL amiga resolutions*
>      Bootable games will kick the Chipset into Lo-res so you cannot use
>      these on your SVGA.

Hmmm... I'm wondering if some software couldn't be written which would
survive a warm boot so that "Mode Promotion" could be used with bootable
games??????????????????????????

                                    NCW

PS

Thanks for the information.

 
 
 

AGA <> Monitor answers

Post by Michael van El » Sat, 14 Nov 1992 11:18:00



Quote:>VGA: Same as SVGA below but is doesn't have same pixel accuracy as dot
>     pitch <.28

Dunno what you mean with 'pixel accuracy'. VGA is just the "standard"
put out by IBM and the various flavours of SVGA offer higher resolution
and more colors and deeper palettes than VGA.

Quote:>SVGA: Displays all amiga Hi-Res modes.

Except HAM with the AGA chipset. Usually has a 18bit palette (AGA has a 24bit).

Quote:>      This allows SVGA monitors to display ALL amiga resolutions*

No. There are modes that can't be promoted like the 1280*xxx modes.

Quote:>      Bootable games will kick the Chipset into Lo-res so you cannot use
>      these on your SVGA.

Most likely: yes.

Quote:>      So no good for games,perfect for WB.

Indeed.

Quote:>Multiscan: Very dangerous to leap out and buy one as you don't know it's range
>       of speeds...

Well, you actually will know what frequencies a monitor understands. Buying
a noname monitor by mail order is of course a risk.

Quote:>1935: Is an SVGA.

SVGA monitors need multiscan capabilities since SVGA is not a fixed
nor even a standardized resolution.

Quote:>1960: A multiscan with exactly the correct range for all resolutions*
>      enables you to use Lo-res without mode promotion saving Chip bus time.
>      (the image will look less 'smooth' however).
>      Bootable games will work fine.

Right.

Quote:>If you have a television why not play the lo-res games on that(they don't
>lose *that* much) and buy an 1935.

Or some other Multiscan.. You could also get a 1084 which has a better
display than many TV's in that size. Hooking this one to a VCR makes
a nice TV too :)

Regards,
--
Michael van Elst
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                                "A potential Snark may lurk in every tree."