U25,26 Zip Video Memory Sockets
The PB430 with a CL-5428 chip is upgradeable to 2 MB of video memory by adding two 256kx16 fast page mode (symmetrical, CAS line) DRAM ZIPS.
The PB430 with a CL-5424 chip is upgradeable to 1 MB of video memory by adding only one suchDRAM ZIP at location U26.
See Also Pb430/440 Video Memory Upgrade
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