On Fri, 27 Apr 2018 13:45:43 +0100
Gareth's Downstairs Computer
 wrote:

> On 27/04/2018 13:27, Ahem A Rivet's Shot wrote:
> > On Fri, 27 Apr 2018 12:52:32 +0100
> > Gareth's Downstairs Computer
> >  wrote:
> >
> >> The graphics processor is built in, and,
> >> mirabile dictu, is also responsible for
> >> booting the system!
> >
> >  Makes a change from the keyboard controller doing it, remember
> > the hoops to get an AT (or clone) out of protected mode before the 386 ?
> >
>
> ISTR a spare unused logic gate?

 Nope, it involved writing a magic value into memory and asking the
keyboard controller to reboot the main processor.

--
Steve O'Hara-Smith                          |   Directable Mirror Arrays
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The computer obeys and wins.                |    licences available see
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