I don't know where on the net to find that, I do know: If you're just
using regular 640x480 VGA, all the video signals are about 1 Volt AC or
so, so it would be possible to use a bunch of analog switches for
switching video, the mouse signals (if you switch those) are either
RS-232 or PS/2 & thus slow signals so switching them isn't tough, the
toughie is in simulating the keyboard to all machines not currently
connected to the keyboard (i.e. if you have the #1 of 6 machines
connected & turn on #2 through #6, the circuit must handle bootup
keyboard acknowledgement properly for them.)

  Audio can also be switched (commonly forgotten by designers of these
boxes, and of remote access (dual station units) - or, they allow you to
choose between mouse & audio, exclusively.  Hard to remote play Doom,
with sound at remote, and with the choice of silencing the unused
machines at the computer bench, then!)

  For higher VGA resolutions, you might want different analog switching;
(Analog switches have bandwidth limitations) (IIRC we covered this a
while back in loads of detail <G>)

  I want Monitor/Kbd/Mouse/Audio out/Audio in switching, myself <G>

  Mark, mwillis@nwlink.com

Szabolcs Nagy wrote:
>
> Greetings to All!
>
> Anybody knows something about the schematic of a Data switching circuit
> (Monitor/Keyboard)?  For example: Where can I find that on the Net... or
> something.
>
> Thankx!
>
> ------------------------------------------------------------------------------
--------
> NAGY SZABOLCS
> IBM Storage Products Kft. - Maintenance Dept.
> Szekesfehervar, Hungary                             Tel.: +36 22 539-496