From ostewart@unam.mx Tue May 14 20:38:44 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!ostewart
From: ostewart@unam.mx (Olga Stewart)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996May14.203844.3507@unam.mx>
Date: Tue, 14 May 1996 20:38:44 GMT
Organization: Universidad Nacional Autónoma de México (DGSCA)
NNTP-Posting-Host: unam.mx
X-Newsreader: WinVN 0.99.5
Lines: 11

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

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?

-- 
=== Olga Stewart ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"Marcus is not one man."

From jsokolov@cam.ac.uk Wed May 15 21:51:44 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!jsokolov
From: jsokolov@cam.ac.uk (Jen Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996May15.215144.1774@cam.ac.uk>
Date: Wed, 15 May 1996 21:51:44 GMT
References: <1996May14.203844.3507@unam.mx>
Organization: University of Cambridge Computer Laboratory
NNTP-Posting-Host: cam.ac.uk
X-Newsreader: WinVN 0.99.5
Lines: 12

In article <1996May14.203844.3507@unam.mx>, ostewart@unam.mx (Olga Stewart) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.
> At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.

That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
=== Jen Sokolov ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"5 sigma is a discovery. 7 is a question."