Konami '504' reproduction

This is my own reproduction of the Konami ‘504’ custom IC with the use of simple logic gates and no CPLD or other moderm programmable logics (call it 'poor man's' if you want...).Original part is a 28 pin 600mil IC found on some Konami  PCBs of 80’s , you can refer to this useful spreadsheet (credits to ‘mattosborn’ on KLOV forums) :

 Konami custom ICs


How often this manufacturer has accustomed us, the IC comes with scratched-off part name:

This time I have been facilitated in my work because Konami itself sometimes replaced their custom ICs with daughter-boards which are faithful TTL implementation of the functions.I was able to get the one made for the '504' : 

Then it was only matter to take schematics of this daughter-board and route them to a PCB layout.The final result is a little board with more or less same dimensions of original part (note the simultaneous use of SOIC and TSSOP devices)

 Reproduction was succefully tested on a Track & Field PCB :