The engineering of the BBC Micro really pushed Acorn's limits, as it was a pretty state-of-the-art machine for the era. This resulted in some fascinatingly half-ass but workable engineering decisions, like having to replicate the placement of an engineer's finger on the motherboard with a resistor pack in order to get the machine to work.
Nobody ever really figured out why the machine only worked when a finger was placed on a certain point on the motherboard, but once they were able to emulate the finger touch with resistors, they were just satisfied it worked, and moved on.
The history of ARM - from obscurity to ubiquitousness
Posted on Monday, Dec 21 2020 @ 11:29 CET by Thomas De Maesschalck