From lmartinez@inria.fr Fri Oct 13 08:02:08 1995
Path: ashpoly!cascade!mxgate!coyoacan!inria!lmartinez
From: lmartinez@inria.fr (Lucia Martínez)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Oct13.080208.4896@inria.fr>
Date: Fri, 13 Oct 1995 08:02:08 GMT
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Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.
CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc.

-- 
Lucia Martínez
Tape trading list upon request. SASE required for international mail.

From tlindqvist@hanse.de Fri Oct 13 19:56:08 1995
Path: ashpoly!cascade!mxgate!coyoacan!hanse!tlindqvist
From: tlindqvist@hanse.de (Tobias Lindqvist)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Oct13.195608.2174@hanse.de>
Date: Fri, 13 Oct 1995 19:56:08 GMT
References: <1995Oct13.080208.4896@inria.fr>
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In article <1995Oct13.080208.4896@inria.fr>, lmartinez@inria.fr (Lucia Martínez) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.
> Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.

The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

-- 
Tobias Lindqvist | tlindqvist@hanse.de
PGP Key fingerprint: FCD4 B1E6 EE71 091C
"Keep the channels open."