>Yeah, and some of the early 1489's (without the Schmidt >trigger) would generate a nice clock signal if you were >between 3 and -3. :-) They must have been real early ones, I dealt with 1489 chips in the late 1970's and they definitely had a Schmidt trigger. It wasn't manufacturer dependant? -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu