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MultiPlayer 5
From SnesLab
The MultiPlayer 5 is a device that allows up to 5 players, plugged into the second controller port.
According to the schematic diagram on page 4-9-10 of the official Nintendo documentation, the MultiPlayer 5 contains four HCT126's and eight HCT241's.
References
- Datasheet for the HCT125, which is nearly identical to the HTC126: https://pdf1.alldatasheet.com/datasheet-pdf/view/546557/NXP/HCT125.html
- Datasheet for the HCT241: https://pdf1.alldatasheet.com/datasheet-pdf/view/15569/PHILIPS/74HCT241.html