OK, one guy says "might be Gottlieb" and another talks about "pulse
stretchers".
How about this, just before Gottlieb went out of business they claimed
to be using piezo switches. The ball hits it, it puts out a pulse. I
never saw how they were doing it, but a piezo pulse would need
stretching, wouldn't it?
Hey John, you might know about late vintage Gottliebs, how did they
handle the piezo switches?
mccullar wrote:
>
> Don't know exactly what the board is used for, but I can say that 74221
> chips are often used as "pulse-stretchers." That is, it takes an input
> pulse and the output pulse is of a width that is dictated by a
> resistor-capacitor combination. Each 74221 is made up of two separate
> pulse-stretchers, so this board effectively has six channels. Perhaps in
> the past a different game board was used inside the cabinet and input
> signals were "stretched" to give the computer more time to time to recognize
> joystick or coin switch commands. Wild guess...
>
> Matt J. McCullar
> Arlington, TX
>
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Received on Sat Dec 15 02:02:35 2001
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