I had a look at the information for the board and can't see any mention of single sided or double sided being required. It doesn't even say in the manual.
If you want a copy of the manual you can obtain it from
http://phase5.a1k.org/index.php?id=2 as a PDF.
The manual states you can use ram with either 32 or PC 36 bit data widths, and ram with a 70ns or faster speed. And also the board is auto configuring so you won't need to set any jumpers when adding ram.
A friend has just told me that most 32MB SIMMs were double sided, and that they should work fine with the Cyberstorm II.
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