PCjr (Was Re: IBM PC hacking)

[Fred Cisin]

> >IIRC, the TechRef for the 10MByte controller contains a schematic with 3
> >chips simply labelled LSI A, LSI B and LSI C. It was fairly obvious from
> >the piuout that one of this was nothing other than a Z80 processor. I
> >think one of the others was something standard too.

On Fri, 30 Sep 2005, Chuck Guzis wrote:
> Probably so, but I never substituted a "stock" Z80 to see if there was
> something different about the IBM version.  OTOH, the "clone"
> controllers like Xebec certainly used the Z80.

The XT HD controller was a relabelled Xebec.
AT switched to WD.