Game Genie multi-codes?

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Zepper
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Game Genie multi-codes?

Post by Zepper » Mon Jan 23, 2017 6:55 pm

I added Game Genie back in my emulator. It's working. ^_^;;

What's the rule when someone wants to enter more than 1 code at a time? In the original GG, how many codes were acceptable? Can I enter a 6 chars AND a 8 chars codes? Two 8 chars codes? Two 6 chars codes?

What's the rule after all? I believe to avoid codes that points to the same address, for example.
I need some advice on it.

tepples
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Re: Game Genie multi-codes?

Post by tepples » Mon Jan 23, 2017 7:01 pm

The original Game Genie supports up to three codes. This could be three 6-character codes, two 6-character codes and zero or one 8-character code, one 6-character code and zero, one, or two 8-character codes, or one, two, or three 8-character codes. I don't know what happens if you add two codes patching the same address.

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rainwarrior
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Re: Game Genie multi-codes?

Post by rainwarrior » Mon Jan 23, 2017 7:21 pm

If you want to see what the original game genie UI looked like, an NROM version of that is available on this site:
http://nesdev.com/genie.zip

Some people do actually chain multiple game genies to implement more codes, though, so in practice the limitations of the hardware have been occasionally exceeded in that way.

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Zepper
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Re: Game Genie multi-codes?

Post by Zepper » Mon Jan 23, 2017 7:24 pm

tepples wrote:The original Game Genie supports up to three codes. This could be three 6-character codes, two 6-character codes and zero or one 8-character code, one 6-character code and zero, one, or two 8-character codes, or one, two, or three 8-character codes. I don't know what happens if you add two codes patching the same address.
So, 3 codes, any combination. Thanks.

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Re: Game Genie multi-codes?

Post by Bavi_H » Tue Jan 24, 2017 6:52 pm

tepples wrote:I don't know what happens if you add two codes patching the same address.
When I examined the writes the Game Genie ROM uses to send the codes to its hardware, the results I saw suggested the following: If you enter multiple codes for the same address, the Game Genie only uses the first one and marks the others as invalid/disabled.

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