From srobertson@mindspring.com Fri Aug 18 13:23:21 1995
Path: ashpoly!cascade!brgate!saturno!mindspring!srobertson
From: srobertson@mindspring.com (Sergei Robertson)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug18.132321.4165@mindspring.com>
Date: Fri, 18 Aug 1995 13:23:21 GMT
Organization: MindSpring Enterprises
NNTP-Posting-Host: mindspring.com
X-Newsreader: NewsWatcher 2.0b24
Lines: 11

Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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

Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot?

-- 
=== Sergei Robertson ===
Dept of Electrical Engineering, MindSpring Enterprises
"A soul is not exclusive to biology."

From deriksson@rwth-aachen.de Sun Aug 20 12:46:21 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!deriksson
From: deriksson@rwth-aachen.de (Diego Eriksson)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug20.124621.5980@rwth-aachen.de>
Date: Sun, 20 Aug 1995 12:46:21 GMT
References: <1995Aug18.132321.4165@mindspring.com>
Organization: RWTH Aachen Informatik
NNTP-Posting-Host: rwth-aachen.de
X-Newsreader: NewsWatcher 2.0b24
Lines: 8

In article <1995Aug18.132321.4165@mindspring.com>, srobertson@mindspring.com (Sergei Robertson) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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.

-- 
Diego Eriksson
Tape trading list upon request. SASE required for international mail.

From mperez@illinois.edu Mon Aug 21 05:58:21 1995
Path: ashpoly!cascade!mxgate!coyoacan!illinois!mperez
From: mperez@illinois.edu (Mikhail Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug21.055821.6954@illinois.edu>
Date: Mon, 21 Aug 1995 05:58:21 GMT
References: <1995Aug18.132321.4165@mindspring.com> <1995Aug20.124621.5980@rwth-aachen.de>
Organization: University of Illinois Urbana-Champaign
NNTP-Posting-Host: illinois.edu
X-Newsreader: NewsWatcher 2.0b24
Lines: 8

In article <1995Aug20.124621.5980@rwth-aachen.de>, deriksson@rwth-aachen.de (Diego Eriksson) writes:
> 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.

Looks like a prototype telecommunications board for military secure voice, not an audio music product.

-- 
Mikhail Pérez -- University of Illinois Urbana-Champaign
"The hatch is open. Is anyone listening?"

From ssokolov@u-tokyo.ac.jp Wed Aug 23 02:28:21 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!ssokolov
From: ssokolov@u-tokyo.ac.jp (Sergei Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug23.022821.7995@u-tokyo.ac.jp>
Date: Wed, 23 Aug 1995 02:28:21 GMT
References: <1995Aug18.132321.4165@mindspring.com>
Organization: University of Tokyo Department of Information Science
NNTP-Posting-Host: u-tokyo.ac.jp
X-Newsreader: NewsWatcher 2.0b24
Lines: 9

In article <1995Aug18.132321.4165@mindspring.com>, srobertson@mindspring.com (Sergei Robertson) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.
> At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

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

-- 
Sergei Sokolov
Tape trading list upon request. SASE required for international mail.