here's the list . . .

From: Richard Erlacher <edick_at_idcomm.com>
Date: Wed Feb 24 13:51:38 1999

It has been about 20 years since I was involved with the AMI chip, but I do
recall that the AMI version is a superset of the MOT version. It has
features not present in the MOT part. I rather doubt they are
interchangeable without firmware modifications.

AMI also made a few parts for the MOT processor family which MOT themselves
never got around to building. One example is the 6834, which is a
two-ported RAM, I believe. It was intended for communication between
multiple processors in a system, but MOT really didn't implement this until
they put out the 68121, which was apparently intended as an intelligent
peripheral controller for an MC68000 family processor. The '121 was a 6803
with a built-in 6834. The part's use was envisioned in a rather narrow way
and, hence never saw much popularity, as it was difficult to use in any way
outside this narrow scope.

I'll see if I can find an old AMI databook . . .

Dick

----------
> From: Arlen Michaels <amichael_at_nortelnetworks.com>
> To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
> Subject: RE: here's the list . . .
> Date: Wednesday, February 24, 1999 12:02 PM
>
> On Mon, 22 Feb 1999, Roger Merchberger <zmerch_at_30below.com> wrote:
>
> > >> BIOTECH ELECTRONICS BCT800 graphics board - uses AMI 68047 chip and
12
> >
> > Erm, sounds like that AMI chip is a clone of Motorola's 6847 VDG, which
> > was
> > used in Tandy's CoCo 1 & 2, and the MC-10.
> >
> > I wonder:
> >
> > 1) if they're pin compatible,
> > 2) if they've got added functionality -- might be fun to play with in
one
> > of my CoCo's if there is!
> >
> It's quite likely that AMI's 68047 is a clone of Motorola's 6847, because
> AMI used to supply pin-for-pin equivalents of a number of Motorola
> 6800-family devices, including the 6821 Peripheral Interface Adapter and
the
> 6850 Asynchronous Communications Interface Adapter. The 68047 and 6847
are
> both 40-pin chips, but I don't have an AMI datasheet handy.
>
> Arlen
>
> --
> Arlen Michaels amichael_at_nortelnetworks.com
Received on Wed Feb 24 1999 - 13:51:38 GMT