harris@catt.ncsu.edu (Michael Harris) (06/10/91)
If I recall correctly, (and someone please correct me if I'm wrong)
that the ULowell board was not designed to forward the video signal from
the internal graphics chips out its video port. This means that an
AmigaDOS user (when support for the board is available) would be required
to switch their monitor from the ULowell board to the display enhancer on the
A3000 and vice-versa whenever he/she changed video resolutions that changed
the graphics circuitry being used. Is this correct information? If so, I
would like to know why the board was done this way? Was it because the
circuitry to do so would further delay the video card? Was the card
predominately designed for UNIX use where such an issue doesn't matter?
(my guess would be this one)
Technically speaking, it is possible... isn't it? To the best of my under-
standing, the ULowell board connects to both the Video expansion port and
a ZorroIII slot. The reason I ask is because I have worked a lot with IBM
video expansion cards. The 8514/A card for example (1024 X 768 X 256) has
extra connections on it that allow it to "pass through" any images from
the onboard VGA display circuitry. I figure that IBM's card can pass through
the signals very easily since the circuitry is similar. Is the ULowell
circuitry so different from the internal display circuitry of the Amiga
that the designers thought that it wasn't practical to add a pass-through?
Just trying to understand,
____________________________________________________________________________
Michael Harris - harris@catt.ncsu.edu or harris@carvm3.vnet.ibm.com
Vice-President, Computer and Technologies Theme Program, NC State University