Donkey Kong Junior arcade DMA controller choice
This is about a component in a computer system being a DMA controller.
Interestingly in a circuit diagram for the Nintendo arcade game Donkey Kong Junior from 1982, even though it has a second-source Zilog Z80 compatible CPU, the DMA controller is an Intel type (8257) instead of a Zilog type.
My theory is that at the time, even though there was domestic second source manufacture for the 8257 but not (possibly) for the Zilog type DMA controller and that Nintendo (and a number of others) wanted to be loyal to their country by trying to only source components from Japanese manufacturers.
Interestingly in a circuit diagram for the Nintendo arcade game Donkey Kong Junior from 1982, even though it has a second-source Zilog Z80 compatible CPU, the DMA controller is an Intel type (8257) instead of a Zilog type.
My theory is that at the time, even though there was domestic second source manufacture for the 8257 but not (possibly) for the Zilog type DMA controller and that Nintendo (and a number of others) wanted to be loyal to their country by trying to only source components from Japanese manufacturers.
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