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- Xref: sparky comp.sys.ibm.pc.hardware:22256 comp.periphs:1149
- Newsgroups: comp.sys.ibm.pc.hardware,comp.periphs
- Path: sparky!uunet!unipalm!steven
- From: steven@unipalm.co.uk (Steven Vincent)
- Subject: Re: Help needed for 16bit Video Card
- Message-ID: <1992Aug20.095632.4471@unipalm.co.uk>
- Organization: Unipalm Ltd., 216 Cambridge Science Park, Cambridge CB4 4WA, UK
- References: <venable.101@faculty.coe.wvu.wvnet.edu> <1992Aug12.134817.27714@ariel.ec.usf.edu> <1992Aug18.221958.8681@constellation.ecn.uoknor.edu> <1992Aug18.224836.10736@constellation.ecn.uoknor.edu>
- Date: Thu, 20 Aug 1992 09:56:32 GMT
- Lines: 34
-
- eric@geoblue.gcn.uoknor.edu (Eric Pyle) writes:
-
- > Hello world,
-
- > About four years ago I got a NEC Powermate I
- > along with a SCSI 3 1/2" Seagate 48 megabyte hard
- > drive; Mitsubishi Diamond Scan 14 with a 16bit SVGA
- > video card. After running the hardware test recently
- > I found out that my 16bit SVGA card is running at
- > 8bit. The reason it runs in 8bit is because part of
- > the system memory addresses between hex C0000
- > through DFFFF is being used by the SCSI drive at
- > around (CA000). The 16bit card needs all of the
- > addresses of RAM from C0000-DFFFF in able to run in
- > 16bit mode.
-
- >
- > Is there a possible way to get my card to run in
- > 16bit mode? I don't want to have paid for a 16bit
- > card when it only runs in 8bit.
-
- Yes get a 16 bit SCSI controller or move the 8 bit one to Exxx.
-
- The ISA bus supports 16 bit read/write in 128k chunks. This
- means that A000-C000 and C000-E000 and E000-FFFF are the groups.
- Since it is the ROM that sits at C000 you shoul shadow this into
- 16 bit RAM and not worry that the ROM is in 16 bit mode. The
- card is probably using 16 bit I/O for the Video RAM between A000
- and BFFF anyway.
-
- Steven Vincent
- Unipalm Ltd.
-
-
-