Celebris 560 mainboard ...
Jakob Ulmschneider
I found stripped out computer in the wastebin. The mainboard was still
in it. After extensive searching I found it belonged to a Celebris PC
with a Pentium 60. It has a socket 4 & socket 5 and an onboard S3 864
VGA chip. Sadly, it does not seem to work. The Bios does not come up.
I have two P60 chips and a whole bunch of parity SIMMS but with none of
them it has worked. From the manual I have seen that normally, there is
a SRAM cache modul installed in a slot. I do not have this cache module
could that be the cause ? Another reason could be the VGA memory chips.
There are 2 empty sockets. Does one have to be filled or is the first
meg of video ram the two chips firmly mounted on the board next two the
empty sockets ? Another cause could be the BIOS chip but I do not
believe that. I have tried all the jumpers in all combinations. Of
course the board could be dead ...
If someone has experience working with this type of computer, any help
would be really nice !
Jakob Ulmschneider
Steve Lionel
<jakob.ulm...@yale.edu> wrote:
> I found stripped out computer in the wastebin. The mainboard was still
>in it. After extensive searching I found it belonged to a Celebris PC
>with a Pentium 60. It has a socket 4 & socket 5 and an onboard S3 864
>VGA chip. Sadly, it does not seem to work. The Bios does not come up.
>I have two P60 chips and a whole bunch of parity SIMMS but with none of
>them it has worked. From the manual I have seen that normally, there is
>a SRAM cache modul installed in a slot. I do not have this cache module
>could that be the cause ? Another reason could be the VGA memory chips.
>There are 2 empty sockets. Does one have to be filled or is the first
>meg of video ram the two chips firmly mounted on the board next two the
>empty sockets ? Another cause could be the BIOS chip but I do not
>believe that. I have tried all the jumpers in all combinations. Of
>course the board could be dead ...
I believe that the cache module is required - it is a non-standard
part and may be difficult to obtain. I had a 256KB module rattling
around in my desk drawer until about nine months ago...
There is normally at least one 1M video RAM chip inserted. You may be
able to do without this if you add your own PCI video card.
I would think that you would get at least some beeps out of the
speaker if the BIOS was coming alive at all... The board may truly be
dead.
--
Steve Lionel (mailto:Steve....@compaq.com)
Fortran Engineering
Compaq Computer Corporation, Nashua NH
Compaq Fortran web site: http://www.compaq.com/fortran
Ben Myers
This Celebris with Socket 4 and Socket 5 is a weird duck.
To run a Pentium 60, you need another little voltage regulator part
that attaches so that it hangs over the Socket 5.
To run a Pentium in Socket 5, you need another little voltage
regulator part that attaches so that it hangs over the Socket 4.
Limit on CPU speed is 100 MHz for Socket 5.
AFAIK, you do not need the cache module installed, because the system
comes up testing for presence of the cache, and runs OK with cache
absent (or disabled in setup).
The vacant video memory sockets take chips that increase the amount of
on-board graphics memory from 1MB to 2MB.
Wish I had a spare voltage regulator part for you, but I don't.
... Ben Myers
Jakob Ulmschneider <jakob.ulm...@yale.edu> wrote:
>Hello,
> I found stripped out computer in the wastebin. The mainboard was still
>in it. After extensive searching I found it belonged to a Celebris PC
>with a Pentium 60. It has a socket 4 & socket 5 and an onboard S3 864
>VGA chip. Sadly, it does not seem to work. The Bios does not come up.
>I have two P60 chips and a whole bunch of parity SIMMS but with none of
>them it has worked. From the manual I have seen that normally, there is
>a SRAM cache modul installed in a slot. I do not have this cache module
>could that be the cause ? Another reason could be the VGA memory chips.
>There are 2 empty sockets. Does one have to be filled or is the first
>meg of video ram the two chips firmly mounted on the board next two the
>empty sockets ? Another cause could be the BIOS chip but I do not
>believe that. I have tried all the jumpers in all combinations. Of
>course the board could be dead ...
>If someone has experience working with this type of computer, any help
Ben Myers
One more thing... Without the voltage regulator module that I
mentioned earlier, the board appears to be dead. Not a peep out of
it. This is because the processor socket is not getting any
electrical current... Ben Myers