death@watcsc.waterloo.edu (Trevor Green) (02/26/90)
Kudos goes to Rich Schroeppel (rcs@la.tis.com) for suggesting a "conceptually simpler" wire-cross design which I managed to convert into a practically simpler wire-cross. I actually came up with two designs - the first is smaller and has a shorter transit time, but the second has a *much* lower IBI. Here they are: ........... .....==.... .==.=..=... I=.===..==. .==.=....=O .....==.==. ......==... .....==.==. .==.=....=O I=.===..==. .==.=..=... .....==.... ........... Transit: 10 IBI: 19 Size: 11x13 .............. .....==.==.... .==.=..==.=... I=.===..==.==. .==.=.......=O .....==.==.==. ......===.=... .....==.==.==. .==.=.......=O I=.===..==.==. .==.=..==.=... .....==.==.... .............. Transit: 13 IBI: 13 Size: 14x13 The three diodes that are the difference between the top and bottom diagram catch electrons that "bounce" back out of the final XORs sooner, clearing the device for input six cycles sooner. Trevor Green death@csc.waterloo.edu watmath!maytag!watcsc!death