From fivanov@purdue.edu Thu Sep 14 23:25:02 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!fivanov
From: fivanov@purdue.edu (Freya Ivanov)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Sep14.232502.3807@purdue.edu>
Date: Thu, 14 Sep 1995 23:25:02 GMT
Organization: Purdue University Engineering Computer Network
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.
At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
Freya Ivanov
Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network.
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From dokonkwo@inria.fr Fri Sep 15 06:58:02 1995
Path: ashpoly!cascade!brgate!saturno!inria!dokonkwo
From: dokonkwo@inria.fr (Dave Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Sep15.065802.6229@inria.fr>
Date: Fri, 15 Sep 1995 06:58:02 GMT
References: <1995Sep14.232502.3807@purdue.edu>
Organization: INRIA Rocquencourt
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In article <1995Sep14.232502.3807@purdue.edu>, fivanov@purdue.edu (Freya Ivanov) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop.

-- 
Dave Okonkwo -- INRIA Rocquencourt
"Tape doesn't lie at 02:14. Ears do."

From jmacdonald@tum.de Sun Sep 17 07:03:02 1995
Path: ashpoly!cascade!mxgate!coyoacan!tum!jmacdonald
From: jmacdonald@tum.de (Jens MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Sep17.070302.6713@tum.de>
Date: Sun, 17 Sep 1995 07:03:02 GMT
References: <1995Sep14.232502.3807@purdue.edu>
Organization: Technische Universität München
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In article <1995Sep14.232502.3807@purdue.edu>, fivanov@purdue.edu (Freya Ivanov) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP?

-- 
Jens MacDonald -- Technische Universität München
"Row 14. No joke."

From mperez@clari.net Tue Sep 19 02:21:02 1995
Path: ashpoly!cascade!transat!ukc!fennimore!clari!mperez
From: mperez@clari.net (Matthias Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Sep19.022102.6732@clari.net>
Date: Tue, 19 Sep 1995 02:21:02 GMT
References: <1995Sep14.232502.3807@purdue.edu>
Organization: ClariNet Communications Corp
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In article <1995Sep14.232502.3807@purdue.edu>, fivanov@purdue.edu (Freya Ivanov) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen.

-- 
Matthias Pérez
Opinions expressed are solely my own and not those of ClariNet Communications Corp.
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