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Old 15 October 2007, 01:31   #1
Join Date: Oct 2004
Location: Ioannina/Greece
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Question Help identifying capacity of cache sram chips...

I have the following cache chips on a 486/100 mobo:

4 x Alliance AS7C512-15PC
and 4 x UM61512-AK-15

the mobo only completes boot when it is jumpered at 512kb cache. Are the above chips giving 512kb? because I get HD read errors when things get heavy... it all began when I wanted to upgrade to 512 from 256kb, and added the alliance chips... removing them does not help now, maybe some have gone bad?
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Old 15 October 2007, 10:08   #2
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Maybe some have gone bad?
What motherboard/chipset is it, maybe it only supports certain combinations/speeds etc.? (are all the sockets full?)

During the 486 era I do recall some motherboards not being all they claimed (fake cache, literally useless chips in sockets, bios showing cache that was not there etc.) do you know what board you got?
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Old 15 October 2007, 10:16   #3
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I have no idea what mobo it is, it is UMC 8886AF + UM8881F based, it has all jumpers silkscreened, and on the bottom right it says: 95C-0067 .. it has an American Megatrends BIOS that looks like windows 3.1 ...
I actually solved the prob... I kept only the original cache chips, and after combinations I found another jumper setting that gives 256kb cache (2 jumper combo) , I did extensive cache/ram testing and copied the 1.2GB C: to D: without any errors... I guess the jumpers where to blame!
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