The Cypress CY27H010-70WC is a 1 Mbit parallel EPROM organized as 128K x 8 bits. It is a non-volatile memory that requires a UV eraser window in the package (32-pin ceramic DIP with quartz lid) to erase and reprogram. The 70 ns access time means the host controller can read data within 70 ns of asserting the address.
At 70 ns, the CY27H010-70WC delivers data within 70 ns of the address being valid on the parallel bus.
The 32-CDIP (Ceramic Dual In-line Package) is a through-hole part with a quartz window for UV erasure. The ceramic body handles the thermal cycling of wave-solder assembly and field rework. The window means the die is exposed to light — keep the erasure window covered with an opaque label in the assembled system to prevent data corruption from ambient UV or strong fluorescent lighting. The through-hole footprint is larger than modern surface-mount memories; verify board real estate if you are retrofitting into a compact design.