claesbas wrote:Thanks for the reply. […]
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Thanks for the reply.
So on the chips it says: SEC KOREA 913 KM44V16100CS-6
and on the sticker it says: PNY 69000176 253-20064-60
Image:
64simm2.jpg
Fortunately a totally different SIMM to the eBay images. Lazy/lousy seller, but at least not trying to sell 4/8MB SIMMs as 64MB.
KM44V16100CS-6 is a 16Mx4 chip, i.e. 64Mb, and eight of those make 64MB (or nine in this case as it's a parity module). So the SIMM checks out: single-sided (as 32/36 address lines, regardless of where the chips are physically located) 64MB parity SIMM.
Interestingly - but not relevant here - the chips are 3.3V and the SIMM has an onboard voltage regulator (that MOSFET) to drop from 5V SIMM voltage to 3.3V chip voltage.
And my Chipset is (Via or Sis) I am not sure:
chipset.jpg
Why not sure, it's right up there in your pic, SiS 471. Which is rather old and almost certainly why you're not getting the full 64MB out of these SIMMS.
Here's the datasheet:
ftp://retronn.de/docs/chipset/SiS%20471.pdf
Fast Page Burst Mode DRAM Controller-4 Banks up to 128MB of DRAMs-256K/512K/1M/2M/4M/16MxN DRAM Type
There's your problem. Just to confuse you, the "M" here is almost competely unrelated to the "M" in chip density. This simply refers to the number of MB per bank. A single-sided SIMM is one bank, a double-sided SIMM fits two banks. Max for one bank is 16MB, and that's what your 64MB SIMMs are showing up as. What this actually means is that the SIS 471 can handle a max of 16Mb chip density. To get 128MB on this board, you'd need four 32MB dual-sided (64/72 address lines) SIMMs.