IBM 1800409-001A - Manual (Page 151)

and default varies depending upon the amount of RAM available
on your system.
If not enough memory is available for this client, some or all of the
optional hard disks may not be accessible and/or an insufficient
number of disk cache blocks may be available.
Administration/Memory/MB Printer Mem
This memory client cannot be changed: it is the amount of RAM
installed in the printer that is available to be split among the other
memory clients.
NOTE: This isn’t the same as the amount of physical RAM
present in the printer. Because the downloaded system
software occupies approximately 3 MB, the amount of
physical RAM required will be 3 MB more than the
amount of RAM available to configurable memory
clients.
Chapter 4
P r i n t e r C o n f i g u r a t i o n 4 - 4 5