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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: swift240 on July 18, 2009, 03:08:30 PM

Title: VGA adapter
Post by: swift240 on July 18, 2009, 03:08:30 PM

Ok a long long time ago, before mediator days.
I used a VGA adapter to a 17inch monitor and it worked well, but because its been such a while now I can not remember the screen resolution I used or even if I used another monitor type in Devs/Monitors?

Can any one here tell me please the screen resolutions I can go to using that? As my mrmory is sadly lacking.

The reason I am asking is that I have a spare Amiga 1200 I have already got the 3.1 ROM's and I want to keep it its original case with the VGA adapter.
From memory I used a Commodore 1084S for Video from the 1200 using the 15Khz mode, as of course the VGA was 31 Khz going to a 17 inch PC monitor.

I would like to get this up and running as soon as possible,

What I have so far a 1200mobo, 3.1 ROM's, top bottom case, Apollo MK4 accelerator with FPU, 32meg fastram. 40gig HD, a CD burner, a DVD ROM, an  4 way IDE99 board,
I have still got the Commodore 1084S, and a Compaq MV740 17 inch
No PSU I may well use a PC PSU though yet, I did before and it worked well.
No FLoppy drive or fixing plates

TIA,

Mike.

Title: Re: VGA adapter
Post by: tone007 on July 18, 2009, 03:14:29 PM

Most VGA monitors will only support Multisync (Productivity) mode and the DBLPAL/DBLNTSC modes unless they can sync down to 15khz (any relatively recent ones wouldn't.)

Title: Re: VGA adapter
Post by: swift240 on July 18, 2009, 03:23:08 PM

Ahhh yes now that rings a bell, its the actual screen resolution I can go to using that I need to know.

Title: Re: VGA adapter
Post by: swift240 on July 18, 2009, 03:37:55 PM

I just dug out my 1200 manual according to this, I get this...........

DBLPAL
High Res                 640 x 256
High Res Laced       640 x 1024
High Res No Flicker 640 x 512
Low Res                  320 x 256
Low Res Laced        320 x 1024
Low Res No Flicker  320 x 512

I cant be 100% certain but I think I used High Res No Flicker 640 x 512 then used the Overscan Editor.

Title: Re: VGA adapter
Post by: Matt_H on July 18, 2009, 05:08:13 PM

Add NTSC equivalent resolutions to that, plus 640x480 for Multiscan, and that completes your compatibility list.

Title: Re: VGA adapter
Post by: swift240 on July 18, 2009, 05:18:39 PM

Ok thanks, yes its all slowy coming back to me now, about that, ahhhhh and I found an old internal floppy drive unit just a few minutes ago, so its all looking good.

Title: Re: VGA adapter
Post by: swift240 on July 18, 2009, 05:49:24 PM

While I am on this, the monitor intended tpo be used is a Compac MV740 but I also use a HP1702 flat screen LCD monitor for my PC, now would this be any better to use on other screen modes as far as flicker goes? or any other sort of advantage goes?

Title: Re: VGA adapter
Post by: tone007 on July 18, 2009, 08:48:22 PM

Generally, Amiga stuff looks better on a CRT. You're also more likely to have modes that don't work right using an LCD, but it's always worth a shot.