From jpopov@illinois.edu Sun Aug 13 18:58:37 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!jpopov
From: jpopov@illinois.edu (Jens Popov)
Newsgroups: comp.sys.m68k
Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug13.185837.1426@illinois.edu>
Date: Sun, 13 Aug 1995 18:58:37 GMT
Organization: University of Illinois Urbana-Champaign
NNTP-Posting-Host: illinois.edu
X-Newsreader: Netscape 1.1N
Lines: 11

Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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.

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

-- 
=== Jens Popov ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"Tape doesn't lie at 02:14. Ears do."

From fsanchez@earthlink.net Mon Aug 14 19:31:37 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!fsanchez
From: fsanchez@earthlink.net (Fiona Sánchez)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug14.193137.3921@earthlink.net>
Date: Mon, 14 Aug 1995 19:31:37 GMT
References: <1995Aug13.185837.1426@illinois.edu>
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
X-Newsreader: WinVN 0.99.5
Lines: 10

In article <1995Aug13.185837.1426@illinois.edu>, jpopov@illinois.edu (Jens Popov) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.
> Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.

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

-- 
=== Fiona Sánchez ===
Dept of Electrical Engineering, EarthLink Network
"Hardware is temporary. The signal survives."