pbw@cbosgd.UUCP (Paul Westerfield) (01/08/84)
I need a good design for a HARDWARE random number generator to go into an 8-bit parallel port (TTL). Actually a simple one bit generator with TTL output and no need to adjust weighting would do. The only design I've seen gets '1' or '0' heavy after awhile, and needs adjustment. Also nice would be a source of CHEAP S-100 bare boards (perf board for wire wrapping). The lowest price I've seen is $45.00 new, and I haven't been able to find used. Reply via mail. Thanks. P.B. Westerfield cbosgd!pbw
davis@hplabs.UUCP (Jim Davis) (01/09/84)
With reference to a hardware random number generator (NOT a Pseudo-random number generator): Any generator that gets 1 or 0 heavy after a while can be easily fixed. Write a routine that when a 0 or a 1 is desired, reads in two values. Let 10 => 1, 01 => 0, and 11 or 00 mean to try again. Too many try agains mean that your generator has died. If the original generator is powered from true noise (no great coefficient between alternate terms) then this will avoid becomming 1 or 0 heavy. -- Jim Davis (James W Davis) ...!ucbvax!hplabs!davis davis.HP-Labs@Rand-Relay ----------------------------------------------------------------