I remember the C64 and those PLA chips ran really hot and were quite often one of the first parts to fail. For 6502 based machines my prefered hardware was an Atari 400 or 800 and Atari actually published the complete assembly listing, it was printed on fanfold paper and arrived in two heavy cardboard boxes. It's a shame about the demise of Commodore and Atari, they backed the wrong horse, Motorola 68000. Apple survived the processor wars but that's probably because they pitched their machines more towards the professional market rather than games. it's all history now but interesting times though.
Commodore's failure has little to do with processor architecture choice and 99% to do with complete and utter mismanagement on the part of upper management.
It is a problem that is unfortunately repeated time and time again in numerous industries when you put accountants and MBAs in charge.
This applies to mines just as equally as it does to technology companies.
While I am *NOT* saying that putting a MBA in charge of a company will always cause it to fail, usually when you put someone who is from accounting or sales in charge of a company that actually "produces" things, more often than not, that is usually when you have trouble.
The reason for that is that they *usually* (though not always) don't appreciate (or understand) the details of the product that they are producing and selling.
In the case of technology products for example, they often can't identify what is "crap" and in the case of mining, they can't identify when they are taking the piss and "high grading" when they shouldn't in the interest of short term gain.
As I said before, this applies just as easily to iron ore or petroleum as it does to technology widgets (such as phones or computers).
I would imagine that this probably applies to other industries as well, but the mining, exploration, technology and aviation industries are those that I have personal experience with.
My $0.02 worth so take it with a bucket load of salt.