🚀 go-pugleaf

John Schott <jschott@voicenet.com> wrote:

>Just a really wild guess.  Some video boards (I don't know about yours)
>map their memory somewhere above the top of RAM.  Like between 16-32
>MB.  So perhaps now that you have all this ram in the area, something
>that uses it occasionally is getting conflicts with video addresses. 
>Check the video boards manual/read-mes.

> [My Basis for this thought:  I've got an older ATI video board that did
>just that (or would have, If I had that much RAM).  In my case, I
>addressed its memory up above 128 MB.]


Good call.  ATI calls that the "memory aperture", and older versions of
their cards defaulted to a fairly low address. (i.e. last few MB of either
16MB or 32MB address space)  Newer versions allow mapping it to a much
higher address.  I didn't think any Tseng ET4000xx cards did that though.  

Another possibility is some device trying to do DMA above 16MB on the ISA 
bus, which can only address 16MB. (the Soundblaster?)  If the Adaptec was
busmastering, that would be the obvious culprit, but 1515 is PIO.  Hmm..

Bas: what chipset is on that motherboard?



Phil



>Bas Bekker wrote:
>> 
>> I have a problem with my computer and I think is related to my Adaptec
>> SCSI controller and my memory.
>> 
>> Problem description:
>> During a back-up or restore with Central Point CP Backupwith 2.0 for
>> Windows, my machine freezes or the tape drive suddenly stops. Things
>> started after I upgraded my memory from 16 Mb to 32 Mb. Once, I was
>> editing a several Mb graphics file, when the status light of DAT
>> streamer started blinking a few times. Also, I heard the CD-ROM player
>> trying to start. This happened a few times while editing this file. Alle
>> my other devices seem to work properly. By removing 16 Mb, the hang-ups
>> disappeared.
>> 
>> Questions:
>> I there an address conflict between the additional memory and the SCSI
>> controller causing these hang-up's? Is there a way to prevent this by
>> configuring Win95 or my BIOS? If not, which amount of memory will not
>> disturb my machine?
>> 
>> Software: MS Windows 95.
>> 
>> Hardware configuration:
>> Vesa local bus 486/DX266 motherboard with AMI BIOS (date 06/06/1992),
>> 32 Mb memory,
>> Adaptec Altra Line AVA-1515 SCSI controller (IQR 11, I/O port
>> 350h-35Fh), connected to the adapter are a HP1534A 4mm DAT tapestreamer
>> and a Panasonic CR504B CD-ROM drive.
>> Tseng Lab ET4000 1 Mb videocard,
>> Multi I/O controller with floppy and hard drive adapter, two 16550 COM
>> ports and one LPT port (standard IRQ's and I/O ports), a 14k4 external
>> modem connected to COM2,
>> 2 Western Digital Caviar hard drives (no LBA or boot patches),
>> Creative Soundblaster 16 ASP soundcard (IRQ 5, DMA 1 and 5, I/O port
>> 220h and 330h -MIDI-) with a joystick connected to it,
>> NE2000 compatible ethernetcard (IRQ 10, I/O port 300h).
>> All are 16 bit ISA cards.
>> 
>> Can anyone help me with this problem   :-/
>> 
>> Bas Bekker.




--
Philip J. Koenig         Computers & Communications           pjk@aimnet.com

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