BTW, here's a forum that's got a real forcus on this stuff: http://www.vintage-computer.com/vcforum/forum.php?
Hmmm...I know it goes the other way--you send a resolution to a CRT that's too high for the CRT, and THAT can kill it. Learned the hard way, in fact. But if you do have a 15-pin vga connector on the computer, any monitor with a matching connector should work. 'Standard' VGA--640x480--remains a 'lowest common denominator' resolution.
So what you need is an ISA VGA adaptor board for your 286. And yes, you can get one.
BTW, here's a forum that's got a real forcus on this stuff: http://www.vintage-computer.com/vcforum/forum.php?

There is any adaptore that will allow me to use a new monitor on a 286 computer?
I have a TRS-80 Model I, Level II Basic, 32K (not Meg
Anybody remember Geoworks? It was a GUI interface that ran over DOS but can be run on XT computers.
Geoworks was written for IBM's OS/2.

Wow, I remember that now - it boots up running whatever video card you selected with that switch - of course your machine had to actually have the appropriate card installed. The now-totally-useless things I used to know...The old MB often had a mono color switch.
I think all the PS/2 models used VGA. I had forgtten EGA until someone mentioned it, and I don't even remember when or what computers it was used on.Somebody talled me that is no adapter. He also talled me that if I will try to plug in a modern C.R.T. monitor I'll blow it up :sigh: , but it'll be no problem to put a modern L.C.D. monitor.
The computer is 286 and the "Olivetti" M290S was realesed into the '80's, but the one I own is manufactured around 1990-1992, so I think it haves a V.G.A. output (I have an black and white V.G.A. monitor with a 480 x 640 rezolution). Shees, about 3 yrs. ago, there where some guys collecting computers for poor kids (now they aren't doing it any more, because they argued); there they had an old "I.B.M." color monitor from the '80's... I should had grab it. The monitor was something like in this image: http://www.1000bit.it/scheda.asp?id=2142