On the 8-bit Creative Game Blaster card, on its left hand side, there are 5 ICs, labelled IC6, IC7, IC8, IC9, and IC10.

What do they do?

On the PCB, they are labelled LS74, LS125, LS08, LS32, and LS138.

For instance, on the LS125 chip, the chip itself is labelled HD74LS125AP

Thanks a lot for any comments.