Re: Star Trek spinner jumps

Nothing wastes time like assumptions.

In case this is news to anyone else, the Sega "single player contoller
board" does NOT send Clock and Direction signals for the spinner to the CPU.

The interface board has a 8 bit counter chip on it, and sends 1 bit for
direction and 7 bits indicating a pulse count.

So, if one of those bits is bad, you'll get bizare jumps all over the
place, because you wont get a true count of the number of pulses since the
last poll of the board.

This thing needs a "Theory of operation" sheet -- it's too simple a board to
spend this much time tracing down what the damn thing does.

Did all the Sega games -- raster and Vector -- use this same interface
method ? Is it possibly documented someplace else ?

(Oh, yeah it works now. Of course, I tested all the lines and they were
fine, and it's working with the cover of the card cage hanging upside down.
I'll see what happens when I put it back on. :-)

-Chris

==========================================================
Chris Candreva -- chris@westnet.com -- (914) 967-7816
WestNet Internet Services of Westchester
http://www.westnet.com/

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Received on Sun Feb 17 12:45:00 2002