1 Nov
2024
1 Nov
'24
11:12 a.m.
On Fri, 2024-11-01 at 11:01 -0700, David Barto via cctalk wrote:
> > The 6502 had a HCF (halt and catch fire)
undocumented
> > instruction.
> > I forget the opcode and if you knew what you were doing you could
> > get the instruction executed on the chip using any assembler.
Early in 1965 Caltech installed one of only a few 360/63 computers.
After they installed it, they discovered that the default instruction
when it started up was HCF. It was replaced with a 360/67.