PB640 Video Memory Upgrade

Video Adapter Upgrade Information.
Installing a video expansion card will automatically disable onboard video for this motherboard.

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.

Driver Information
The PB640 uses CL-5430/5440 Video Drivers. The CL-5430/40 is compatible with IBM VGA standards.

Screen Resolutions
1MB expandable to 2MB
1024 x 768, 256 colors with 1MB
1280 x 1024, 256 colors with 2MB
VESA Display Channel supported
DPMS compliant

Specifications
The PB640 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 MB814260-70PJ-ER
Hitachi HM514260AJ-7T
Micron Technology MT4C16257DJ-7TR
Mitsubishi M5M44260-AJ-7-T10
NEC UPD42S4260LE-70ITR or UPD42460LE-70ITR
Samsung KM416C256AJ-7T or KM416C256BJ-7T
Toshiba TC514260BJ-70(EL)

Location
The video memory upgrade is inserted in sockets U2J1 and U4J1. Pin 1 is at the front right corner of the socket. To install the chip, insert it into the socket and push until the chip snaps into place.




Chip Insertion


Specifications

Part #

Equivalent PB Part #
2 - 256KB x 16, 70ns SOJ DRAM TC514260BJ-70 080378