The Gottlieb MA-490 is a cost-reduced board which is just the older MA-55 with a kludge piggyback board plugged into it increasing the ROM capacity. Used in Amazon Hunt (late production), Rack’Em Up, Ready… Aim… Fire!, Jacks to Open, Touchdown, Alien Star, The Games, El Dorado City of Gold and Ice Fever.
This board is meant to be loaded onto an Alterra Cyclone II board and hooked up to a PS/2 keyboard to be triggered. It has not been tested in a real machine but should work with a couple of simple modifications.
https://github.com/FPGA-Code/Gottlieb-MA-490
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