Originally posted by gingerjedi
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The BBC Micro delays came about in a rather odd way: the Video ULA needed to be clocked at 18MHz, but manufacturers Ferranti weren't certain it would be possible to achieve a good enough yield with the chip-making facilities of the day. Acorn asked them to give it a try, and on the trial batch they were delighted to find that yields were perfectly fine.
So they announced the launch and went into production, whereupon it became apparent that the trial run had been pure fluke and yields in full-scale manufacturing were abysmal
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