From jmartinez@kth.se Thu Aug 08 06:53:20 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!jmartinez
From: jmartinez@kth.se (Ji-woo Martínez)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Aug08.065320.9210@kth.se>
Date: Thu, 08 Aug 1996 06:53:20 GMT
Organization: Royal Institute of Technology, Stockholm
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.
CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

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

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

From emacdonald@cam.ac.uk Thu Aug 08 13:52:20 1996
Path: ashpoly!cascade!transat!ukc!fennimore!cam!emacdonald
From: emacdonald@cam.ac.uk (Élodie MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Aug08.135220.9993@cam.ac.uk>
Date: Thu, 08 Aug 1996 13:52:20 GMT
References: <1996Aug08.065320.9210@kth.se>
Organization: University of Cambridge Computer Laboratory
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In article <1996Aug08.065320.9210@kth.se>, jmartinez@kth.se (Ji-woo Martínez) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

-- 
Élodie MacDonald
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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