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The XGA specification supports 4 MB of video memory. (Doesn't mean the actual implementation supports it though...)
Compatible Devices
MSM514262-80Z
MT42C4256Z-8
TC524256BZ-10
µPD42274V-10
TN-42-01 Upgrading from 1 Meg to 2 Meg VRAMs
TN-42-02 Designing with MT42C4256/8128 VRAM
TN-42-03 Regular, Real-Time, Split Read Transfers
TN-42-04 Bank Interleaving w/ EDO VRAMs
TN-42-05 Four-Column vs Eight-Column Block Write
MSM514262 Pinout
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Pin Name Function
A0 - A8 Address Input
RAS Row Address Strobe
CAS Column Address Strobe
DT/OE Transfer/Output Enable
WB/WE Mask/Write Enable
DSF Special Function Input
W1/IO1 - W4/IO4 RAM Inputs/Outputs
SC Serial Clock
SE SAM Port Enable
SIO1 - SIO4 SAM Inputs/Ourputs
QSF Special Function Output
VCC Power Supply (5 V)
Vss Ground (0 V)
NC No Connection
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MSM514262 Block Diagram
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