Official Nintendo EPROM Cartridge
Here's an official reprogrammable EPROM cartridge from Nintendo. These are the carts that were used during development of games, and maybe even used to test some unreleased prototypes :-). I'll have to dump the SRAM on it some day to look for saved data. I've been using this myself for testing of games over 8mbit, since this cart is much less fragile than the EPROM cart that I built. I still prefer the flash cart over this though.
Front of EPROM cart.
Back of EPROM cart.
Specs:
Cart takes either 4 or 8 mbit EPROMs, and has 256kbit of SRAM. The standard cart only has 64kbit, so I assume this was used to prepare for future games that needed the extra SRAM.
4 dip switches are installed. These select which EPROM size is used, and whether the SRAM is enabled or disabled. DIPs are on when switch is up.
DIP 1 connects to pin 1 on the EPROM from the top pin, and pin 16 of the edge from the bottom pin.
DIP 2 connects to the top pin of DIP 1 from the top pin, and an unused header for capacitor C7 (DIP is useless).
DIP 3 connects to pin 20 on the SRAM from the top pin, and pin 6 of the edge from the bottom pin. This pin is also pulled up with a 10kohm resistor.
DIP 4 is not connected on either pin (DIP is useless).
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DIP 1
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DIP 2
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DIP 3
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DIP 4
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4mbit EPROMs w/ no SRAM
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OFF
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Don't Care
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OFF
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Don't Care
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4mbit EPROMs w/ SRAM
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OFF
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Don't Care
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ON
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Don't Care
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8mbit EPROMs w/ no SRAM
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ON
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Don't Care
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OFF
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Don't Care
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8mbit EPROMs w/ SRAM
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ON
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Don't Care
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ON
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Don't Care
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