Re: [midatlanticretro] Re: look for early 19+ NEC Multisync or equivalent
- --- Jim Scheef <jscheef@...> wrote:
> I'm not sure how theDude, first of all...THANKS! :). Let me see how does
> horizontal frequency translates to screen
Basically, multiply the vertical sychronization
scanning frequency by the resolution and that's
roughly the horizontal sync scan rate (you have to
allow for overscan though, those "lines" of resolution
you don't get to play with or generally even see).
Take for instance my Tandy 2000. 640 x 400 @ 60hz.
400 x 60 = 24,000 or 24khz. The card actually outputs
25.something, because there's extra "lines" there. In
TV broadcasts, I think the overscan can actually carry
information, perhaps even closed captioned stuff and
> If you have a display adapter that supports thePC's can work with this style of monitor, but it used
> frequencies (just about
> anything made in the last 10 years) you can run this
> monitor under Linux
> using the manual setup for X-Windows. A PC can play
> nice with a fixed
> frequency monitor but it greatly limits your
> choices. You know, it might be
> easier to use it on an old Sun workstation.
to require a special card, or a highly tweaked off the
shelf video card. I'm going back to the mid 90's now
when these things were plentiful. They readily plug up
to Macs and as you pointed out, Suns and SGI's too.
Every now and again you have a problem though. I once
sold, perhaps the very model Jim has, to a guy who
wanted to use it with his whatever PowerMac. For some
reason though, it wouldn't sync up properly with his
puter. Not positive what the reason was, but it may
have had something to do with the width of the sync
pulses. It worked fine with my IICX and E-machines
Futura video card. The polarity of the sync pulses
didn't have anything to do with it, all those monitors
basically used negative going pulses.
Back in the earlyish 90's, a guy in Derry, NH came
out with a manual called "the Cheap VGA" book, which
described how to get these monitors to work with a pc.
There were all sorts of little tweaks you could
employ, but sometimes you actually had to build a
little circuit to accomplish the task. But even if you
did get a monitor to work at a specific resolution, as
soon as say a game changed it, you were shirt out of
luck. Those were fun days. I used to find these things
dirt cheap and sell them for buckeroos LOL LOL.
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