INTEGRATED SILICON SOLUTION (ISSI) IS62C5128BL-45QLI SRAM, 4MBIT, 45NS, 32SOP
32K Industrial Standard SRAM, 5V, 45ns Access Time, 32-Pin SOP
Standard SRAM, 512KX8, 45ns, CMOS, PDSO32
SRAM Chip Async Single 5V 4M-bit 512K x 8 45ns T/R