From elopez@stanford.edu Fri Jan 05 23:07:44 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!elopez
From: elopez@stanford.edu (Élodie López)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Jan05.230744.1191@stanford.edu>
Date: Fri, 05 Jan 1996 23:07:44 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'.

One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket?

-- 
Élodie López <elopez@stanford.edu>
"Hold for relay."
PC-9821Ap2 (NEC) / NEXTSTEP 3.3

From knilsson@ox.ac.uk Sat Jan 06 13:42:44 1996
Path: ashpoly!cascade!bigsur!ox!knilsson
From: knilsson@ox.ac.uk (Kirsty Nilsson)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Jan06.134244.7448@ox.ac.uk>
Date: Sat, 06 Jan 1996 13:42:44 GMT
References: <1996Jan05.230744.1191@stanford.edu>
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In article <1996Jan05.230744.1191@stanford.edu>, elopez@stanford.edu (Élodie López) writes:
> 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.

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

-- 
=== Kirsty Nilsson ===
Dept of Electrical Engineering, Oxford University Computing Laboratory
"The hatch is open. Is anyone listening?"

From phernandez@rwth-aachen.de Mon Jan 08 11:09:44 1996
Path: ashpoly!cascade!brgate!saturno!rwth-aachen!phernandez
From: phernandez@rwth-aachen.de (Pavel Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Jan08.110944.4378@rwth-aachen.de>
Date: Mon, 08 Jan 1996 11:09:44 GMT
References: <1996Jan05.230744.1191@stanford.edu> <1996Jan06.134244.7448@ox.ac.uk>
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In article <1996Jan06.134244.7448@ox.ac.uk>, knilsson@ox.ac.uk (Kirsty Nilsson) writes:
> The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

Looks like a prototype telecommunications board for military secure voice, not an audio music product.

-- 
Pavel Hernández -- RWTH Aachen Informatik
"Marcus is not one man."