[Coco] CoCo TALK #18 an introduction to OS9

[Peter Cetinski]

Pete

> On Jul 24, 2017, at 12:20 PM, Wayne Campbell <asa.rand at gmail.com> wrote:
> 
> The Model 6000 was a 68000 system with a Z80 co-processor. I read somewhere
> once that Tandy tried pairing a 6809 as a co-processor with the 68000, and
> it ran circles around the 6000 with the Z80. Why they did not pursue that
> line I do not know, other than Tandy's thinking was already geared towards
> PC compatibles and wasn't interested in pursuing the TRS-80 line anymore.

The Z-80 was required.  They needed to keep backwards compatibility with all of the Z-80 based Model II software, including a lot of TRSDOS and CP/M titles.