From msmirnov@kth.se Tue Mar 21 16:47:09 1995
Path: ashpoly!cascade!mxgate!coyoacan!kth!msmirnov
From: msmirnov@kth.se (Mikhail Smirnov)
Newsgroups: comp.sys.m68k
Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Mar21.164709.2304@kth.se>
Date: Tue, 21 Mar 1995 16:47:09 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.

The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.
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?

-- 
=== Mikhail Smirnov ===
Dept of Electrical Engineering, Royal Institute of Technology, Stockholm
"When every node is whole, the channel opens."

From ktakahashi@panix.com Thu Mar 23 17:56:09 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!ktakahashi
From: ktakahashi@panix.com (Kirsty Takahashi)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Mar23.175609.4083@panix.com>
Date: Thu, 23 Mar 1995 17:56:09 GMT
References: <1995Mar21.164709.2304@kth.se>
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In article <1995Mar21.164709.2304@kth.se>, msmirnov@kth.se (Mikhail Smirnov) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

-- 
Kirsty Takahashi | ktakahashi@panix.com
PGP Key fingerprint: 2FBB 1646 B080 1DBD
"Keep the channels open."

From llopez@illinois.edu Fri Mar 24 12:59:09 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!llopez
From: llopez@illinois.edu (Lars López)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Mar24.125909.5205@illinois.edu>
Date: Fri, 24 Mar 1995 12:59:09 GMT
References: <1995Mar21.164709.2304@kth.se> <1995Mar23.175609.4083@panix.com>
Organization: University of Illinois Urbana-Champaign
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In article <1995Mar23.175609.4083@panix.com>, ktakahashi@panix.com (Kirsty Takahashi) writes:
> Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire).

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.

-- 
Lars López -- University of Illinois Urbana-Champaign
"In theory there is no difference between theory and practice."