Here is the VirtualBoy schematic, thanks to
Gravis Zero:
Multiple VirtualBoy pads are supported using
the same interface as SNESKEY. For pads 2..5 hook
them up the same as pad 1, but don't make
the DB25-10 connection. Instead, make the
connection according to the following table:
Last updated April 19, 1999. Comments
welcomed. This site and all information
contained within is Copyright 1999 Earle F. Philhower, III.
Iomega, Syquest, SparQ, Jaz, Zip, and other names are trademarks
or property of their respective owners.