22 Feb
2006
22 Feb
'06
5:26 p.m.
I realize that I'm talking about something much later
in time, but didn't Windows 95 engage in "thunking",
meaning, IIUC, to revert to 16 bit code (i.e.
non-protected mode stuph)? So therefore, at least
newer Pentium series uPs, had the ability to switch in
and out of protectd mode. M$ had us believing that
Chicago was rewritten from the ground up (I think they
said that in the beginning), and didn't rely on 16-bit
code whatsoever.
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Yup.
Because once in protected mode on the 286,
you can't get out unless
you reset the CPU.
-spc (I think you could get out by tripple
faulting ... )
Could you, in general. I think you can on the PC/AT,
but I seem to recall
a circuit that detects the odd state of the bus
status lines if you get a
triple fault, and then resets the CPU, or toggles a
pin on the keyboard
controller, or...
-tony