Re: [Tack-devel] [Spam] MINIX 1.5 and ACK

[David G. <dg...@co...>]

Did the Z8000 do split I/D? The 8086 cheated because both code *and* data
got different 64kB address spaces, so you could have 64kB of code and still
have 64kB of data. I don't think you could fit the compiler into a single
64kB space.

There is a Z8000 code generator in the ACK but it's based on the old _old_
code generator model and was last touched in the 1990s, so I don't know
whether it works or what the code quality is like. Plus, of course, then
you need to make it fit.


On Fri, 22 Mar 2019 at 14:05 Christian Groessler <ch...@gr...>
wrote:

> Hi,
>
> On 3/11/19 8:13 AM, Jacobs, C.J.H. via Tack-devel wrote:
> > Good question! I survived, and I produced those binaries back then. But
> this was a very long time ago,
> > and my memory has never been any good... nor are my archiving skills...
> When I find some time, I’ll
> > see if I can do some digging. From what I remember, the only real
> problem was getting the compiler front-end
> > to fit in 64K instruction space and 64K data space. For that, we took
> out the C preprocessor (which was/is built-in
> > into the C frontend) and made it a separate pass, and we also took out
> the floating-point library. Other than that,
> > I don’t remember exactly, but I think it was just a little bit of
> tweaking.
>
>
> It would be great if you would find this version.
>
> I'm toying with the idea to port Minix 1.5 to the Olivetti M20, a Z8000
> based computer. The Z8000 has 64K segments as well.
>
> regards,
> chris
>
>
>
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