PB520 RAM Memory Upgrade

Caution Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty.
 
Specifications
  1. SIMM speed must be 70ns or faster.
  2. The simms are 72-pin and can be x32 or x36. The motherboard design does not require parity checking, hence the cheaper x32 simms can be purchased.
  3. Some motherboards may have 2 or 4 SIMM sockets. Therefore, allowing a maximum of either 72 or 136 MB.

Socket Locations
SIMMs are inserted in Bank A or B, sockets J25 - J28. One Bank must be filled when the upgrade is done. Some systems may have a second bank (A) for a maximum of 136MB. When bank A is not present then bank B becomes the first bank.

Upgrade Table
SIMM Bank 0
SIMM Bank 1
Total System Memory
72 pin 4, 8MB X 32
72 pin 4, 8MB X 32
4MB
4MB
None
None
16MB
4MB
4MB
4MB
4MB
24MB
4MB
4MB
8MB
8MB
32MB
4MB
4MB
16MB
16MB
48MB
4MB
4MB
32MB
32MB
80MB
8MB
8MB
None
None
24MB
8MB
8MB
4MB
4MB
32MB
8MB
8MB
8MB
8MB
40MB
8MB
8MB
16MB
16MB
56MB
8MB
8MB
32MB
32MB
88MB
16MB
16MB
None
None
40MB
16MB
16MB
4MB
4MB
48MB
16MB
16MB
8MB
8MB
56MB
16MB
16MB
16MB
16MB
72MB
16MB
16MB
32MB
32MB
104MB
32MB
32MB
None
None
72MB
32MB
32MB
4MB
4MB
80MB
32MB
32MB
8MB
8MB
86MB
32MB
32MB
16MB
16MB
104MB
32MB
32MB
32MB
32MB
136MB