ET4000 VAL16-8D dedicated custom PROM by Tseng Labs *** NOT to be confused with ET4000 VGA/EGA/CGA/MDA controller *** Tested as 4K-Word x 4-Bit Pre programmed with a Check Sum (CRC) of: 726709E0 Possibly a support chip for ET4000 VGA chip used on graphic cards? any info appreciated. Package: 20-DIP Status: NOS (New Old Stock) circa 1991 RoHS compliant: no