only pins 1-32 are used. Leave 33 and 34 unplugged on both the sound board and MPU.

These ribbon cables can rip at the ends. You can build yourself a new connector with wire, crimp supplies, and an hour or so of time.

There are ICs on the input signals of the sound board. If one of these has a short to ground, it will lock up the MPU. I have seen that before more than once. Exhaust connector issues first as that is more likely though.

Don't worry about the key in the header pins as the ribbon cables aren't keyed. The left two pins in the MPU and sound board are left unconnected. Just make sure the right pin on the MPU is connected to the right pin on the sound board. The ribbon cable will have a slight twist.

On the sound board, diode test every pin on the input plug. Red lead on ground of your sound board. Black lead touch every pin and note each one that is connected to ground or has a non standard voltage drop. THen refrences the schematic and look to see if anything is grounded it shouldnt be. An address or data line should not be shorted to ground and if they are, it will lock up your MPU.

An open line on your connector could also confuse the MPU and lock it up. Check for continuity across the connector or replace it.

Here ya go. I had some difficulty getting it sorted out too. Glad i took some photos first lol

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