davet@tsdiag.ccur.com (Dave Tiller N2KAU) (12/18/90)
I made one in college for a 'battle of the brains' type of game. It consisted of 8 switches hooked into a bank of 8 latches (or flip/flops) that latched the first player's switch actuation. The outputs of the ff's drove incandescent lamps and an 8 input nand gate (7430) that provided feedback to the latches enable line to disable further closures from appearing. Within the constraints of propagation delay, this circuit was absolutely fair, without counters or such mess. The master reset for the ff's was on the moderator's podium. Hope this helps. -- David E. Tiller davet@tsdiag.ccur.com | Concurrent Computer Corp. FAX: 201-870-5952 Ph: (201) 870-4119 (w) | 2 Crescent Place, M/S 117 UUCP: ucbvax!rutgers!petsd!tsdiag!davet | Oceanport NJ, 07757 ICBM: 40 16' 52" N 73 59' 00" W | N2KAU @ NN2Z