Subj : Re: HCF Halt and Catch Fire To : Tony Langdon From : John Riley Date : Sat May 16 2020 09:52:50 TL> I had heard that the originel Intel 4004 had a HCF instruction that TL> effectively shorted +5V to GND via the CPU, letting the magic smoke out. Ah, never heard of it being on the 4004. Cheers! j --- Mystic BBS v1.12 A45 2020/02/18 (Raspberry Pi/32) * Origin: The Gatehouse BBS (1:229/981) .