From spark@uu.net Mon May 01 14:24:07 1995
Path: ashpoly!cascade!transat!ukc!fennimore!uu!spark
From: spark@uu.net (Seo-yeon Park)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May01.142407.3423@uu.net>
Date: Mon, 01 May 1995 14:24:07 GMT
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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'.
The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

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

-- 
Seo-yeon Park | spark@uu.net
PGP Key fingerprint: 54E5 75E8 BFD6 AA2A
"Keep the channels open."

From tandersson@purdue.edu Tue May 02 20:07:07 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!tandersson
From: tandersson@purdue.edu (Tobias Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May02.200707.5323@purdue.edu>
Date: Tue, 02 May 1995 20:07:07 GMT
References: <1995May01.142407.3423@uu.net>
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In article <1995May01.142407.3423@uu.net>, spark@uu.net (Seo-yeon Park) writes:
> 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'.

Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire).

-- 
Tobias Andersson
Tape trading list upon request. SASE required for international mail.

From vreyes@mit.edu Wed May 03 19:49:07 1995
Path: ashpoly!cascade!brgate!saturno!mit!vreyes
From: vreyes@mit.edu (Valeria Reyes)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May03.194907.8842@mit.edu>
Date: Wed, 03 May 1995 19:49:07 GMT
References: <1995May01.142407.3423@uu.net>
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In article <1995May01.142407.3423@uu.net>, spark@uu.net (Seo-yeon Park) writes:
> 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'.

Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM.

PGP Public key available via finger or upon request.

-- 
=== Valeria Reyes ===
Dept of Electrical Engineering, Massachusetts Institute of Technology
"Do not worship the copy."

From flaurent@titech.ac.jp Fri May 05 07:16:07 1995
Path: ashpoly!cascade!mxgate!coyoacan!titech!flaurent
From: flaurent@titech.ac.jp (Freya Laurent)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May05.071607.8479@titech.ac.jp>
Date: Fri, 05 May 1995 07:16:07 GMT
References: <1995May01.142407.3423@uu.net>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1995May01.142407.3423@uu.net>, spark@uu.net (Seo-yeon Park) 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.

-- 
Freya Laurent -- Tokyo Institute of Technology Computer Centre
"There are 14 nodes and only 10 countries. Count again."