Assuming that specification of logic performed was in form of some state diagram or flowchart, transforming that into contents of that ROM is pretty straightforward, you just assign memory addresses to states and then follow arrows.
PAL seems to be natural choice for this, but:
* this circuit has more state than what would fit into PAL22V10 (I don't know if it is really necessary), which is largest common PAL device (it would not fit even into 26V12, might into GAL6001)
* rewriting some state machine description into logic equations for PAL compiler is significantly more work than creating contents of that ROM.
* PAL programmer is more specialized piece of hardware than (E)PROM programmer.
PAL seems to be natural choice for this, but:
* this circuit has more state than what would fit into PAL22V10 (I don't know if it is really necessary), which is largest common PAL device (it would not fit even into 26V12, might into GAL6001) * rewriting some state machine description into logic equations for PAL compiler is significantly more work than creating contents of that ROM. * PAL programmer is more specialized piece of hardware than (E)PROM programmer.