Digital DECpc LPv/LPv+
Service Procedures
MCS Logistics Engineering - Nijmegen
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Installation Procedures
Installing External Cache Memory
The computer's main logic board supports up to 256 KB of direct-mapped write back secondary cache
memory. Secondary cache memory is designed to improve the performance of the CPU and is installed in
designated DIP sockets on the main logic board.
For the DECpc LPv, secondary cache memory consists of four or eight 32 KB x 8 cache SRAM chips and
three 16 KB x 4 cache tag SRAM chips.
LPv Cache chip locations
Cache Upgrade
Main Logic Board Cache Sockets Main Logic Board Cache Tag Sockets
0 to 128 KB
E15 through E18
E6 through E8
0 to 256 KB
E15 through E18
E12 through E14
E6 through E8
128 to 256 KB
E12 through E14
To install a cache SRAM chip:
1) Turn off the computer.
2) Disconnect external devices, ac powerand monitor power.
3) Unlock and remove outside cover.
4) Locate appropriate DIP sockets on main logic board.
5) Remove secondary cache memory chips from antistatic packaging, handling each chip only by edges.
6) Position each chip with notched end facing rear of computer. Insert each chip into appropriate DIP
socket.
7) Set all appropriate cache jumpers.
8) Replace and lock outside cover.
9) Connect external devices and restore power.
CAUTION
Installing external cache memory incorrectly might cause the computer to malfunction.
