From lnilsson@u-tokyo.ac.jp Wed Mar 13 09:45:11 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!lnilsson
From: lnilsson@u-tokyo.ac.jp (Lisa Nilsson)
Newsgroups: comp.sys.m68k
Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Mar13.094511.8493@u-tokyo.ac.jp>
Date: Wed, 13 Mar 1996 09:45:11 GMT
Organization: University of Tokyo Department of Information Science
NNTP-Posting-Host: u-tokyo.ac.jp
X-Newsreader: WinVN 0.99.5
Lines: 10

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.
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?

-- 
Lisa Nilsson
Tape trading list upon request. SASE required for international mail.

From rlaurent@netcom.com Fri Mar 15 05:24:11 1996
Path: ashpoly!cascade!transat!ukc!fennimore!netcom!rlaurent
From: rlaurent@netcom.com (Raj Laurent)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Mar15.052411.2537@netcom.com>
Date: Fri, 15 Mar 1996 05:24:11 GMT
References: <1996Mar13.094511.8493@u-tokyo.ac.jp>
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: WinVN 0.99.5
Lines: 11

In article <1996Mar13.094511.8493@u-tokyo.ac.jp>, lnilsson@u-tokyo.ac.jp (Lisa Nilsson) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
=== Raj Laurent ===
Dept of Electrical Engineering, NETCOM On-Line Communication Services
"A soul is not exclusive to biology."

From svasiliev@uni-hamburg.de Fri Mar 15 06:56:11 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!svasiliev
From: svasiliev@uni-hamburg.de (Steve Vasiliev)
Newsgroups: comp.sys.m68k
Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Mar15.065611.2459@uni-hamburg.de>
Date: Fri, 15 Mar 1996 06:56:11 GMT
References: <1996Mar13.094511.8493@u-tokyo.ac.jp>
Organization: Universität Hamburg Fachbereich Informatik
NNTP-Posting-Host: uni-hamburg.de
X-Newsreader: Netscape 1.1N
Lines: 10

In article <1996Mar13.094511.8493@u-tokyo.ac.jp>, lnilsson@u-tokyo.ac.jp (Lisa Nilsson) writes:
> 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.

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

-- 
Steve Vasiliev
Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik.
------------------------------------------------------------