I believe we started using 74HC by 1994-1986= .. Sent from AOL Mobile Mail -----Original Message----- From: George Smith jrcr@dea.s= pamcon.org> To: Microcontroller discussion list - Public. <piclist@mit.edu> Sent: Sat, Oct 20, 2018 11:58 AM Subject: Re: [EE} old components David C Brown wrote: > My problem is that i cannot remember what CMOS chips were available 40 > years ago. I am fairly sure that the CD4000 series was established by th= en > but cannot remember if the Texax HC74 series had been released. >=20 > Anybody got a really good memory or, even better, old data books? Texas TTL databook (Second European Edition) 1977 only list 74, 74L and=20 74LS. In the 1980 (fourth edition) supplement I can see some 74H and=20 74S but no HC. George Smith --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ= & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/picl= ist