home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!rpi!scott.skidmore.edu!psinntp!psinntp!parlan!richardw
- From: richardw@hub.parallan.com (Richard Walter)
- Newsgroups: comp.sys.ibm.ps2.hardware
- Subject: Re: XGA Questions
- Message-ID: <ymBuTB1w164w@hub.parallan.com>
- Date: Fri, 06 Nov 92 15:12:09 PST
- References: <1992Nov5.022915.4294@lynx.dac.northeastern.edu>
- Organization: Parallan Computer, Mountain View CA
- Lines: 21
-
- pclark@lynx.dac.northeastern.edu (Peter Clark) writes:
-
- > Actually, the XGA card that I have seems to be a 32bit with an
- > additional little port at the end of the card.
- >
- > Interesting eh? :)
- >
- The little port at the end of the card is a video extension to the
- MicroChannel. PS/2 (maybe all, maybe some) have video on the main
- board. If you plug in another video card, the system needs to know
- that it should use route accesses to video memory to the card, and
- not to the planar. It also needs to know to call the Video BIOS on
- the card and not use the one built into the system ROMs. That little
- connector also has access to the Red, Green & Blue lines, so that you
- don't have to unplug the monitor from the back of the system and re-plug
- it into the video card.
-
- It is interesting, eh? :)
-
- -Richard Walter
- richardw@parallan.com
-