Here's my theory about the Zelda test carts, which may also explain the origin of this or any other "one-off" test cartridge:
Service centers were required to perform a "burn-in test" on NES control decks after they repaired them. The standard procedure was to set up a work station with a monitor, video cables, power supply, and game cartridge. Basically, they connected the console, powered it on with a game inside and then left it running all day in order to make sure it wouldn't overheat before they returned it to the customer.
The game that Nintendo recommended for this test is The Legend of Zelda. I believe that most service centers ordered the antistatic yellow test cartridge housing along with a spare Zelda label and standard Zelda game board (all of which have individual part numbers listed) and assembled the Zelda test carts to be used for this purpose. This would have been a good way to differentiate them from the other Zelda carts that may have been sent in for repair.
I think most service centers followed Nintendo's recommendation and used Zelda for this test, which would explain why there are so many of them that have surfaced over the years. However, they could have chosen any game that was available at the time. Super Mario Bros/Duck Hunt would have been a good choice because they could use it to test both of the controller ports and the zapper without switching out cartridges.
Here's my theory about the Zelda test carts, which may also explain the origin of this or any other "one-off" test cartridge:
Service centers were required to perform a "burn-in test" on NES control decks after they repaired them. The standard procedure was to set up a work station with a monitor, video cables, power supply, and game cartridge. Basically, they connected the console, powered it on with a game inside and then left it running all day in order to make sure it wouldn't overheat before they returned it to the customer.
The game that Nintendo recommended for this test is The Legend of Zelda. I believe that most service centers ordered the antistatic yellow test cartridge housing along with a spare Zelda label and standard Zelda game board (all of which have individual part numbers listed) and assembled the Zelda test carts to be used for this purpose. This would have been a good way to differentiate them from the other Zelda carts that may have been sent in for repair.
I think most service centers followed Nintendo's recommendation and used Zelda for this test, which would explain why there are so many of them that have surfaced over the years. However, they could have chosen any game that was available at the time. Super Mario Bros/Duck Hunt would have been a good choice because they could use it to test both of the controller ports and the zapper without switching out cartridges.
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