Specifications

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CHAPTER 3
MEMORY EXPANSION
The CYBERSTORM PPC Accelerator features a 64-bit wide memory expansion option,
realized by 4 standard SIMM sockets where memory modules can be installed. It is
necessary for the operation of the CYBERSTORM PPC to install at least 8 MByte of memory
(two modules each with a size of 4 MB); some of todays complex software applications,
however, may require a larger amount of memory to operate.
As the memory expansion on the CYBERSTORM PPC is 64-bit wide, it is necessary to
expand the memory with pairs of equal PS/2 type memory modules, which are each 32-bit
wide. The CYBERSTORM PPC provides two logical memory banks, bank 0 and bank 1
(please refer to picture 6 for the location of the memory banks). Bank 0 must always be
populated with SIMMs first. When installing pairs of equal SIMMs in each of the memory
banks, always make sure that you use absolutely identical types of SIMMs (same memory
speed, same type, preferrably same vendor) in order to avoid problems with the memory
access which may result in a complete system failure.
The size of the memory installed on the CYBERSTORM PPC is automatically recognized,
and the memory will be automatically configured and added to the system memory, provided
that the memory is correctly installed following these instructions. The CYBERSTORM PPC
will accept pairs of industry standard 32-bit SIMMs (also known as PS/2 type SIMMs) with
memory sizes of 4 MByte, 8 MByte, 16 MByte and 32 MByte per SIMMs. It is allowed to use
pairs of different sized SIMMs in each of the banks; however, it is necessary that ALL SIMMs
installed on the CYBERSTORM PPC have the same speed.
EXAMPLE:
You can install two 8 MByte SIMMs in memory bank 0, and two 16 MByte SIMMs
in memory bank 1, and will have a total installed memory of (2 x 8) + (2 x 16) = 48
MByte. In any possible combination, you will always get one continguous block
of memory with the total size of the SIMMs installed. It makes no difference in
which memory bank the larger SIMMs are installed.
ATTENTION!
If the memory on the CYBERSTORM PPC is not installed in pairs and following
the instructions above, this may result in a wrong recognition of the installed
memory and related system malfunction.
The SIMMs that can be used may either be 32-bit types (without parity) or 36-bit types (with
parity); if 36-bit types are installed, the parity bits of these SIMMs are ignored. The SIMMs
installed on the CYBERSTORM PPC must be 70ns speed grade or faster; it is highly
recommended to look for 60ns or faster types when new modules are bought.
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