Please help identifying these mysterious components

Hello
i have some mysterious IC with many many legs! I'll list down what is printed on their rear anr front. If there is any programmable one amongst me do let me know


Front Rear
5581-9117 PPB-071
RM-512A MDC04210-1
SR 23C4000 9120 PBC 166
3399-9118 PBA 127
0410-9120 PBA 164

LOOKING :roll: forward for BUNDLES of REPLIES and IDEAS as USUAL!

How many pins is "many many"?
For me not clear what is on the front (top) side?