Subject: Re: DEC - VGA video adaptor?
To: None <firstname.lastname@example.org>
From: John Maier <email@example.com>
Date: 07/02/2001 13:50:09
If you have experience with low-level electronic work, this might be of help:
There are some errors in the circuit diagram of the LM1881N (Pin 1 is not a
HSYNC out but COMPOSITE -- yes I've told him) but read the spec sheet and it
will all become clear. I submitted the NAND-AND gate circuit just below the
LM1881N diagram, to split the Hsync from the composite if your monitor cannot
handle a Composite on the HSYNC--some are rumored to be able--mine can't. It
seems to have something to do with the expected timing of the signals,
Also I have found that some monitors with auto powersave just have problems, so
not all monitors work, so if you can either turn off the autopower save or have
a monitor that don't have it, your better off. I've seem similar problems with
MAC VGA adaptors at resolution above 640x480 but not with not power saving
Don't ask me where you can get the elusive EL4583 from Elantec; every place I've
ever found them listed, say they are out of stock with no time frame for getting
any in :-( But if you find some, let me know, I'd like to try one out!
DigiKey is a good place to get the LM1881N and other parts.
John Maier - Administrator
Midamerica Internet Services
/ Nothing great was ever achieved without
/ enthusiasm. --- Ralph Waldo Emerson