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INTV-1 MODIFICATION TO SUPPORT SYSTEM CHANGER:

Blue Sky Rangers System Changer
Note: I don't like intv-1s because they don't seem to last very long, and recommend getting an intv2 instead.

INTV-2 QUICK TURNOFF:

Deathskull Labs Archive This one is easy

GENESIS CONTROLLER ADAPTER:

Deathskull Labs Archive (again!) This most of the library more fun to play. I built this into my own intv, the only change I made was to give all the direction lines blocking diodes and pullup resistors (like the fire buttons) so the disc would keep its sixteen direction behavior.

If you're going to do the genesis adapter with 74266 ICs, be careful because the GICCM webpage has the wrong pinout, the correct one is listed below. The guy still hasn't corrected it after two emails.

74266 Quad 2-input open-collector XNOR gates.

    +---+--+---+             +---+---*---+          _     _ _
 1A |1  +--+ 14| VCC         | A | B |/Y |     Y = A$B = (A.B)+(A.B)
 1B |2       13| 4B          +===+===*===+
/1Y |3  74   12| 4A          | 0 | 0 | Z |
/2Y |4  266  11| /4Y         | 0 | 1 | 0 |
 2A |5       10| /3Y         | 1 | 0 | 0 |
 2B |6        9| 3B          | 1 | 1 | Z |
GND |7        8| 3A          +---+---*---+
    +----------+
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