Folks, I probably have some, and now I have found my ICL House Codes sheet I may even be able to identify them. However I won't be in the same country as my stock for a couple of weeks..... ... and they are in the UK so getting them stateside may take some time.
Dave G4UGM > -----Original Message----- > From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of Chuck Guzis via > cctalk > Sent: 15 May 2022 16:12 > To: cctalk@classiccmp.org > Subject: Re: Replacement for a DEC 7474 Chip > > On 5/15/22 01:16, Eric Smith via cctalk wrote: > > > I don't think that worked on any TTL (or CMOS) 74x74 flip flops, > > except maybe by accident if you shorted the output enough to draw Vcc > > down (or ground up) enough to disrupt the FF, and then you have other > problems. > > Checking my old Moto databook, the old FFs appear to be capable of > having the outputs jammed. At first glance, both the 7472 and 7473 FFs > had unbuffered outputs. Most early latches, likewise. > > Of course, the very early TTL was density-constrained, so FFs like the > MC512/MC563 are of course without buffered outputs. > > --Chuck
