I was trying to connect both of my Dreamcast and PowerMac MorphOS in one display via a vga switch. PMAC is version 3.1. with MorphOS version installed 3.1 plus Pack Ultimate 3.1. I am using a 9200 Radeon with 64MB VRAM connected through a DVI to VGA adapter. The Dreamcast bears the VGA Box version 2. I am using grounded/more expensive VGA cables. First I ordered this 2 road VGA switch. And though Dreamcast was displyaing correctly at 640x480@60Hz with A/A on, the problem was that MorphOS was using the same resolution (640x480). Made of course attepmpts without teh DC connected without any difference at the outcome. At Prefs/Screen, though pub ambient screen was displaying the previous resolution (before using the vga switch) I was using (1280x1024), when I am editing it I get available only 640x480 (the actual resolution that MorphOS is using and not what what the Prefs shows). I though that I had a hardware problem with the switcher so I ordered another one, in particular this one. It arrived yesterday but the problem keeps appearing.

Seems like the usual DCC-failure ....

If you had your monitor working correctly previously it should still be available in Prefs->Monitor (you need to click "edit" to select it).

Select it or if not available any other monitor with specs close to it.
Hit "Save"
Reboot
Reselect 1280x1024 mode in Prefs->Screens

Yes I had my monitoring working correctly when not connected to the vga switch, actually if I unplug the VGA cable from the switcher, plug it to the monitor directly and reboot I get my usual 1280x1024 screenmode.

Anyway, when I go to Prefs/Screen it displays the following: "Ambient Radeon 9000 24Bit 1280x1024 Nox2" (1280x1024 is the old screenmode I was using, though I repeat, what I am actually seeing is 640x480 already).

If I edit it I only get two modes "Radeon9000: 16Bit 640x480 5x6x5 59.7Mhz" and "Radeon9000: 24Bit 640x480 8x8x8 59.7Mhz".

Btw it's a Radeon 9000 not 9200 as I wrongly stated in my opening message.

What should I do? I can't have two dedicated monitors for MOS and DC (there is not enough space available in my room)..

[ Edited by Cool_amigaN 17.11.2012 - 15:06 ]

Your still in Prefs->Screens, go to Prefs->monitor as I've written above....

It worked, many thanks!

PS: Still why MOS suffered froma DCC failure connected to the switcher while monitor was the same?

[ Edited by Cool_amigaN 17.11.2012 - 20:50 ]