From rhughes@purdue.edu Thu Dec 15 10:48:53 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!rhughes
From: rhughes@purdue.edu (Rodrigo Hughes)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Dec15.104853.3148@purdue.edu>
Date: Thu, 15 Dec 1994 10:48:53 GMT
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Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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

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

-- 
Rodrigo Hughes
Tape trading list upon request. SASE required for international mail.

From rwatanabe@cmu.edu Fri Dec 16 11:58:53 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!rwatanabe
From: rwatanabe@cmu.edu (Rodrigo Watanabe)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Dec16.115853.3053@cmu.edu>
Date: Fri, 16 Dec 1994 11:58:53 GMT
References: <1994Dec15.104853.3148@purdue.edu>
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In article <1994Dec15.104853.3148@purdue.edu>, rhughes@purdue.edu (Rodrigo Hughes) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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

-- 
Rodrigo Watanabe | rwatanabe@cmu.edu
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"Keep the channels open."