32X 50/60Hz automatic slave switch

Copyright (C) 2012 by Maximilian Rehkopf (ikari_01) [email protected] Idea by n00b

This program is designed to run on a PIC12F629 or compatible micro controller. It determines the frequency of the VSync signal on pin 5 and switches the output level of pin 6 accordingly (50Hz = 0V; 60Hz = 5V).

This program is released to the public domain; it is the wish of the author that the original attributions stated above remain unchanged.

pin configuration:

                   ,---_---.
                5V |1     8| GND
                nc |2     7| nc
                nc |3     6| 50/60Hz switch out
                nc |4     5| Vsync in (TTL)
                   `-------'

Vsync can be taken from cartridge slot pin B13 or CN4 pin 15. No sync separator required.