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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!boulder!juliet!drew
- From: drew@juliet.cs.colorado.edu (Drew Eckhardt)
- Subject: Re: DUAL MONITORS! Problem rebooting! HELP!
- Message-ID: <1992Jul28.022418.5638@colorado.edu>
- Sender: news@colorado.edu (The Daily Planet)
- Nntp-Posting-Host: juliet.cs.colorado.edu
- Organization: University of Colorado at Boulder
- References: <1992Jul28.110553.9687@waikato.ac.nz>
- Date: Tue, 28 Jul 1992 02:24:18 GMT
- Lines: 59
-
- In article <1992Jul28.110553.9687@waikato.ac.nz> singlis@waikato.ac.nz writes:
- >I have a 386/33 Mhz machine with a trident 8900cs card, and a
- >brand new hercules graphics card. (also 1 serial/par & int.modem)
- >
- >When I reboot (alt-ctrl-del), the hercules card shows a capital N tilde
- >in the top left of the mono screen and the machine won't reboot
- >properly.
- >
- >The CMOS reports "error", press F1 to continue, F2 to setup etc.
- >
- >It's a Phoenix bios.
- >
- >Can you help????
-
- Poblems you may encounter :
-
- #1:
-
- You can thank IBM for problem 1. In their infinite wisdom,
- they provided a set of unlatched address lines with a 128k granularity.
- Now, in order to get a 16 bit transfer, you must pull the mem16
- line low to get a 16 bit transfer before you have a set of
- latched addresses. Unfortunately, you only have the address to
- within 128k. The mono card's address at 0xb0000 - 0xb7fff
- falls right in the middle of the Trident board's 128K address
- space from 0xa0000 - 0xbfffff. When the Trident sees something
- in that range, it says "gimme a 16 bit transfer". The latched lines
- become valid, the trident goes oops, and the 8 bit mono board gets
- a 16 bit transfer.
-
- To get around this, you must switch the Trident board to 8 bit mode.
- Note that this will reduce speed considerably.
-
- #2:
-
- Real hercules boards have "text", "half", and "full" modes. Text mode
- has a 4k address space starting at 0xb0000, "half" mode
- a 32k address space, and "full" mode a 64k address space (allowing
- 2 pages of graphics).
-
- Full mode will overlap color text mode address space, from
- 0xb8000 - 0xbffff. You must configure the card for half mode
- or text mode - this may be done in hardware or software.
-
- one page of graphics, where as the "full" mode allows for two
-
- #3:
-
- BIOS problem. Some BIOS's might be unhappy having multiple displays
- in the system, some will allow only one as the "primary"
-
- You should try changing the primary display. Run setup, set it
- to mono, and change the motherboard jumper for a mono primary display.
-
- The DOS mode command can be used to switch which monitor is used
- for DOS programs.
-
-
-
-