From deriksson@panix.com Mon Nov 13 03:27:24 1995
Path: ashpoly!cascade!bigsur!panix!deriksson
From: deriksson@panix.com (Dong-hyun Eriksson)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov13.032724.4114@panix.com>
Date: Mon, 13 Nov 1995 03:27:24 GMT
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
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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?

-- 
=== Dong-hyun Eriksson ===
Dept of Electrical Engineering, Public Access Unix of New York
"Measuring a record you own is listening, not piracy."

From ssilva@kth.se Mon Nov 13 06:29:24 1995
Path: ashpoly!cascade!mxgate!coyoacan!kth!ssilva
From: ssilva@kth.se (Sun-mi Silva)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov13.062924.2633@kth.se>
Date: Mon, 13 Nov 1995 06:29:24 GMT
References: <1995Nov13.032724.4114@panix.com>
Organization: Royal Institute of Technology, Stockholm
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In article <1995Nov13.032724.4114@panix.com>, deriksson@panix.com (Dong-hyun Eriksson) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

-- 
Sun-mi Silva
Tape trading list upon request. SASE required for international mail.

From jmoreau@inria.fr Tue Nov 14 15:13:24 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!inria!jmoreau
From: jmoreau@inria.fr (Ji-woo Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov14.151324.5856@inria.fr>
Date: Tue, 14 Nov 1995 15:13:24 GMT
References: <1995Nov13.032724.4114@panix.com>
Organization: INRIA Rocquencourt
NNTP-Posting-Host: inria.fr
X-Newsreader: TIN [version 1.2 PL2]
Lines: 9

In article <1995Nov13.032724.4114@panix.com>, deriksson@panix.com (Dong-hyun Eriksson) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space.

-- 
Ji-woo Moreau
Opinions expressed are solely my own and not those of INRIA Rocquencourt.
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