Re: Chipsandcheese article on the CDC6600

On Tue, 23 Jul 2024 9:53:57 +0000, Michael S wrote:

I don't like how IBM screwed interrupts architecture of IBM PC,
completely ignoring Intel's recommendation to assign hardware
interrupts to INT #32 and higher.
The unnecessary mess they created had negative effect for a long time,
15 years at least.
Also I am not sure that at time (1981) 8250 was the optimal choice for
UART chip.

It is not just IBM, but every interrupt architecture prior to MSI-X
messages are screwed up (and most after MSI-X, too).
The property one wants is that VMexit has to do nothing to the
interrupts/controllers in order to gain full control over the core.