On 25/02/2021 23:17, Steve Walker wrote:

Yes, there was certainly a chip back in the '90s (it might have been
called Viper) where every combination had been thoroughly tested and it
was known that there were no hardware design faults. I'm sure such chips
must exist today and, if so, the simple code required for something like
a remote should also be able to be exhaustively tested (automated
testing) and provide a system that cannot fault or lock up - ignoring
hardware failure.

But a remote is a battery operated device and electronics have a limit
to how low a power supply can go.
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