From gmacdonald@utexas.edu Sat Aug 17 10:22:21 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!gmacdonald
From: gmacdonald@utexas.edu (Göran MacDonald)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Aug17.102221.5359@utexas.edu>
Date: Sat, 17 Aug 1996 10:22:21 GMT
Organization: University of Texas at Austin
NNTP-Posting-Host: utexas.edu
X-Newsreader: Netscape 1.1N
Lines: 11

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

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

-- 
=== Göran MacDonald ===
Dept of Electrical Engineering, University of Texas at Austin
"A soul is not exclusive to biology."

From ynakamura@panix.com Sun Aug 18 05:29:21 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!panix!ynakamura
From: ynakamura@panix.com (Yuki Nakamura)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Aug18.052921.4170@panix.com>
Date: Sun, 18 Aug 1996 05:29:21 GMT
References: <1996Aug17.102221.5359@utexas.edu>
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
X-Newsreader: WinVN 0.99.5
Lines: 9

In article <1996Aug17.102221.5359@utexas.edu>, gmacdonald@utexas.edu (Göran MacDonald) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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

-- 
Yuki Nakamura | ynakamura@panix.com
PGP Key fingerprint: 8A68 B5CE DF09 351B
"Keep the channels open."