You can also go the opposite direction although its much slower by burning 4K eprom (12 bits is 4 bits of A, 4 bits of B, and 4 bits of opcode, 12 bits is a 4K

You can also go the opposite direction although its much slower by burning 4K eprom (12 bits is 4 bits of A, 4 bits of B, and 4 bits of opcode, 12 bits is a 4K eprom). Both modern eeprom or eprom or especially old eprom will be much slower than the old TTL implementations by maybe a factor of ten. The interest in this design is modern eproms can be quite large, of course the largest ones are serial which is quite useless for this purpose, but 8 bit ALUs are possible.