Reply to post: Re: @big_D

Rookie almost wipes customer's entire inventory – unbeknownst to sysadmin

Antron Argaiv Silver badge

Re: @big_D

...and not only the mainframe manufacturers.

DG processor boards had all kinds of little option jumpers. On the newer designs, it was microcode PROMs, so they started covering them with epoxy when the customers figured out that they could change instruction sets (we had commercial and scientific, IIRC, and one cost more than the other) by changing microcode.

I worked in communications and networking, but even then, there were boards with fewer UARTs which could be upgraded simply by adding the missing parts (they filled the empty holes with solder to make it harder).

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