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A feature of
Release 6.5 and above is an increase in maximum memory to 16GB over
the previous maximum of 3.75GB. Most users inferred that all newer
systems would be able to take advantage of this feature. Unfortunately
this is not the case. The MPE operating system is not the only limiting
factor in determining the largest memory configuration a system
can have.
Older systems are physically limited by number of slots and the
largest size memory boards and/or arrays that are available such
as the 922/932/948/958 family and the 9x7 family of processors.
Of the newer systems only those which are based on PA-8000 or PA-8200
RISC processors are candidates for higher memory configurations.
PA-8x00 processors are 32-bit RISC processors with 64-bit memory
extensions. To address more than 3.75GB of memory requires 64 bits.
To add to the confusion, not all of the systems in the Series 9x9
family carry the same processor. Earlier versions of the low-end
929, 939, and 969 systems use PA-7000 processors. The newer 9x9/030
systems are utilizing the PA-8000 processors. Furthermore, only
the Series 997 systems can go up to the maximum 16GB liimit. The
9x9 systems have a maximum of 8GB.
Here is a simplified list of the systems that will support more
than 3.75GB:
929KS/030
939KS/030
979KS/x00
989KS/x00
989KS/x50
997/x00
All other systems
(including Series 992, 995, and 996 systems) will not handle more
than 3.75GB.