PB540/550/560 Video RAM Upgrade

Warning 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

The PB540/550/560 can be upgraded to 2MB video memory using two 256Kx16-70ns SOJ DRAM chips. The following brands and part numbers are recommended:

Manufacturer

Part No(S).

Fujitsu MB814260-70J-ER
Hitachi HM514260AJ-7T
Micron Technology MT4C16257DJ-7TR
Mitsubishi M5M44260-AJ-7-T10
NEC UPD42S42560LE-70ITR or UPD42460LE-70ITR
Samsung KM416C256AJ-7T or KM416C256BJ-7T
Toshiba TC514260BJ-7(EL)

Location

The video memory upgrade is inserted in sockets U2J1 and U3J1. Pin 1 is at the front right corner of the socket. To install the chip, insert it into the socket and push it on the chip until it snaps into place.

Specifications

Part

Equivalent PB Part

2 - 256KB x 16, 70ns OJ DRAM TC514260BJ-70 080378