Thread View: comp.sys.ibm.pc.hardware.misc
3 messages
3 total messages
Started by David Longley
Thu, 18 Jan 1996 00:00
Octek Chipset based VLB Board: Clock running Fast ??
Author: David Longley
Date: Thu, 18 Jan 1996 00:00
Date: Thu, 18 Jan 1996 00:00
26 lines
1863 bytes
1863 bytes
I've been working on a VLB Octek Chipset based motherboard with a
486-25SX which has been run at 33MHz in the past. BIOS is MR
BIOS.
Problem 1) - If the system is left on for about 30 mins and then
switched off and back on, after the setup delay and
memory check, the system puts up a message saying it
is waiting for the hard disk to spin up and then
just times out. Poking around inside at the VLB
video card/HD controller (multifunction card (it
will come back to life.
Problem 2) - It looks like the system time clock is running
rather fast, the seconds look like they're passsing
twice as fast as they should.
At the moment I have 2 70ns 30 pin SIMMs in the system and 2
100ns 30 pin SIMMs. (I know the latter are slow, but they seem to
pass the POST. I have now put the system back to 25MHz.
Are the two problems above related? What do I have to change to
correct the system clock problem? ie what's the chip?
Alternatively, anyone got a 486VLB board they are throwing out?
--
David Longley
Re: Octek Chipset based VLB Board: Clock running Fast ??
Author: David Longley
Date: Thu, 18 Jan 1996 00:00
Date: Thu, 18 Jan 1996 00:00
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1391 bytes
1391 bytes
Some further details: I have a problem with my system clock. It seems to be running fast and I don't know what to do about it. It's got two MR BIOS chips on it. A standard EPROM marked MR BIOS (c) 1989,1990,1991 and a longer DIL plug in chip marked MR BIOS VR3030H (c) Microid Research 1994. The seconds on the clock in the BIOS seem to be going by faster than in DOS applications, and the system is certainly gaining time dramatically. Can you advise where the problem is? System comprises: 4 MB RAM (2 x 70ns 2 x 100ns 30 pin SIMMs) 80486-25SX clocked at 33 MHz (step back to 25 no difference) MS BUS Mouse -- David Longley
Re: Octek Chipset based VLB Board: Clock running Fast ??
Author: David Longley
Date: Thu, 18 Jan 1996 00:00
Date: Thu, 18 Jan 1996 00:00
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2276 bytes
In article <821933493snz@longley.demon.co.uk>
David@longley.demon.co.uk "David Longley" writes:
> I've been working on a VLB Octek Chipset based motherboard with a
> 486-25SX which has been run at 33MHz in the past. BIOS is MR
> BIOS.
>
> Problem 1) - If the system is left on for about 30 mins and then
> switched off and back on, after the setup delay and
> memory check, the system puts up a message saying it
> is waiting for the hard disk to spin up and then
> just times out. Poking around inside at the VLB
> video card/HD controller (multifunction card (it
> will come back to life.
>
> Problem 2) - It looks like the system time clock is running
> rather fast, the seconds look like they're passsing
> twice as fast as they should.
>
> At the moment I have 2 70ns 30 pin SIMMs in the system and 2
> 100ns 30 pin SIMMs. (I know the latter are slow, but they seem to
> pass the POST. I have now put the system back to 25MHz.
>
> Are the two problems above related? What do I have to change to
> correct the system clock problem? ie what's the chip?
>
> Alternatively, anyone got a 486VLB board they are throwing out?
> --
> David Longley
>
The clock seems to race whilst in MR BIOS's setup, but *look*
like it's incrementing normally in DOS applications such as
XTGOLD. Is there a specific chip which runs the clock?
--
David Longley
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