Cache Memory; System Memory - Digital Equipment VAX 4000 108 User Information

Cache Memory

The VAX 4000 Model 108 system has 512 KB of cache on the system board.

System Memory

The VAX 4000 Model 108 System has one bank of four Single-In-Line Memory Modules
(SIMMS) with 16 MB each, for a total of 64 MB, or optional 32MB SIMMs for a total of
128MB. There are slots for a second optional bank of memory. The memory options
include adding a second bank of 16 MB SIMMS (128/196 MB total), or a second bank of
32 MB SIMMs (196/256 MB total). As available, a second SIMM carrier will increase
maximum memory size to 512MB.
Memory Configuration Rules
•
Random-access memory can be added only in four SIMM increments (four per bank).
•
There are two banks, J1-4 and J5-8; always fill at least one bank completely. See
Figure 3-2 for SIMM Bank configuration.
•
To fill a bank, start at one end of Bank J5-J8 and fill every SIMM socket in the bank.
Each bank MUST be completely filled with like SIMMs, if it is filled at all.
•
Do not mix SIMMs within a bank
•
Use same SIMM size within a bank.
Installing Hardware Options
VAX 4000 Model 108 User Information 3–3