24 Feb
1999
24 Feb
'99
5:51 a.m.
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
----------
the
From: Arlen Michaels
<amichael(a)nortelnetworks.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)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(a)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 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(a)nortelnetworks.com