🚀 go-pugleaf

In article <817521624snz@abaldwin.demon.co.uk>
           vyn@abaldwin.demon.co.uk "mervyn.baldwin" writes:

> A couple of years ago I ran a 286 with DRDOS 5.
> I think you can only do what you are trying to do if you have a NEAT
>  chipset (or similar) Things may have changed in V6 but I doubt if 
>  this did - so HIDOS.SYS only works with a limited range of 'Chips
>  and Technologies' based computers.
> 

I don't think this is the case: the 286 has a bug that makes it 
possible to access to first 64k of memory above the 1Mb barrier, 
and this was taken advantage of to allow DOS to be loaded high. 
So any 286 should be able to load DOS high, if it has extended 
memory, or if the machine has 1Mb of memory, rather then 640k, 
and the chipset relocates the memory between 640k and 1Mb above 
the 1Mb barrier.

The feature you are referring to with the C&T Neat chipset was to
allow device drivers and stuff to be loaded high between 640k and
1Mb, like you can do with a 386 or 486. DRDOS specifically 
supported this.

I stand to be corrected on the above: I think my brain has a 
parity error these days. :)

-- 
Mike Tomlinson