74LS197
Presettable BCD Decade Ripple Counter / Presettable 4-Bit Binary Ripple Counter
14 Pin DIP Package
DM74LS491AN
10-Bit Up/Down Counter
24Pin .3" DIP Package
This rare IC is used on the Tron and other Midway spinner optic boards.
DM74LS491AN
10-Bit Up/Down Counter
24Pin .3" DIP Package
This rare IC is used on the Tron and other Midway spinner optic boards.
If your Trons spinner is not working chances are good the LS491 or the optical switch is bad.
74LS197
Presettable BCD Decade Ripple Counter / Presettable 4-Bit Binary Ripple Counter
14 Pin DIP Package
74LS423
Dual Retriggerable Monostable Multivibrators
16 Pin DIP Package
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