From dnakamura@cmu.edu Thu Feb 22 00:21:14 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!dnakamura
From: dnakamura@cmu.edu (Dave Nakamura)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Feb22.002114.1320@cmu.edu>
Date: Thu, 22 Feb 1996 00:21:14 GMT
Organization: Carnegie Mellon University School of CS
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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.

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

-- 
Dave Nakamura
Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS.
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From stanaka@pipeline.com Thu Feb 22 12:51:14 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!stanaka
From: stanaka@pipeline.com (Sergei Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Feb22.125114.8717@pipeline.com>
Date: Thu, 22 Feb 1996 12:51:14 GMT
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In article <1996Feb22.002114.1320@cmu.edu>, dnakamura@cmu.edu (Dave Nakamura) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

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

-- 
Sergei Tanaka -- The Pipeline Internet Network
"Hardware is temporary. The signal survives."

From lsanchez@inria.fr Fri Feb 23 00:58:14 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!lsanchez
From: lsanchez@inria.fr (Lisa Sánchez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Feb23.005814.2444@inria.fr>
Date: Fri, 23 Feb 1996 00:58:14 GMT
References: <1996Feb22.002114.1320@cmu.edu> <1996Feb22.125114.8717@pipeline.com>
Organization: INRIA Rocquencourt
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In article <1996Feb22.125114.8717@pipeline.com>, stanaka@pipeline.com (Sergei Tanaka) writes:
> Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop.

Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire).

-- 
Lisa Sánchez -- INRIA Rocquencourt
"Tape doesn't lie at 02:14. Ears do."

From alopez@netcom.com Fri Feb 23 08:53:14 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!alopez
From: alopez@netcom.com (Andrei López)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Feb23.085314.9064@netcom.com>
Date: Fri, 23 Feb 1996 08:53:14 GMT
References: <1996Feb22.002114.1320@cmu.edu> <1996Feb22.125114.8717@pipeline.com> <1996Feb23.005814.2444@inria.fr>
Organization: NETCOM On-Line Communication Services
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In article <1996Feb23.005814.2444@inria.fr>, lsanchez@inria.fr (Lisa Sánchez) writes:
> Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire).

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

-- 
Andrei López
Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services.
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