4M x 4 Bit 2k 5 V 60 ns FPM dram 4M x 4 Bit 4k 5 V 60 ns FPM dram 4M x 4 Bit 2k 3.3 V 60 ns FPM dram 4M x 4 Bit 4k 3.3 V 60 ns FPM dram 4M x 4 Bit 2k 3.3 V 50 ns FPM dram 4M x 4 Bit 4k 3.3 V 50 ns FPM dram -4M x 4-Bit Dynamic RAM 4M x 4-Bit Dynamic RAM 2k & 4k Refresh (Fast Page Mode) From old datasheet system