From dmoreau@kiae.su Sun Apr 14 09:43:48 1996
Path: ashpoly!cascade!transat!ukc!fennimore!kiae!dmoreau
From: dmoreau@kiae.su (Diego Moreau)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Apr14.094348.2572@kiae.su>
Date: Sun, 14 Apr 1996 09:43:48 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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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.

Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc.

-- 
Diego Moreau
Tape trading list upon request. SASE required for international mail.

From lvasiliev@demon.co.uk Tue Apr 16 10:14:48 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!lvasiliev
From: lvasiliev@demon.co.uk (Lars Vasiliev)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Apr16.101448.8844@demon.co.uk>
Date: Tue, 16 Apr 1996 10:14:48 GMT
References: <1996Apr14.094348.2572@kiae.su>
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In article <1996Apr14.094348.2572@kiae.su>, dmoreau@kiae.su (Diego Moreau) 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.

-- 
Lars Vasiliev
Opinions expressed are solely my own and not those of Demon Internet Services UK.
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From bpark@illinois.edu Wed Apr 17 18:46:48 1996
Path: ashpoly!cascade!brgate!saturno!illinois!bpark
From: bpark@illinois.edu (Bruno Park)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Apr17.184648.4468@illinois.edu>
Date: Wed, 17 Apr 1996 18:46:48 GMT
References: <1996Apr14.094348.2572@kiae.su> <1996Apr16.101448.8844@demon.co.uk>
Organization: University of Illinois Urbana-Champaign
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In article <1996Apr16.101448.8844@demon.co.uk>, lvasiliev@demon.co.uk (Lars Vasiliev) writes:
> That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM.

-- 
Bruno Park
Tape trading list upon request. SASE required for international mail.

From lhughes@stanford.edu Thu Apr 18 03:53:48 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!lhughes
From: lhughes@stanford.edu (Liam Hughes)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Apr18.035348.2014@stanford.edu>
Date: Thu, 18 Apr 1996 03:53:48 GMT
References: <1996Apr14.094348.2572@kiae.su>
Organization: Stanford University Computer Systems Lab
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In article <1996Apr14.094348.2572@kiae.su>, dmoreau@kiae.su (Diego Moreau) writes:
> 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.

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

-- 
Liam Hughes -- Stanford University Computer Systems Lab
"Tape doesn't lie at 02:14. Ears do."

From mhughes@clari.net Sat Apr 20 06:37:48 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!mhughes
From: mhughes@clari.net (Marisol Hughes)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Apr20.063748.8220@clari.net>
Date: Sat, 20 Apr 1996 06:37:48 GMT
References: <1996Apr14.094348.2572@kiae.su>
Organization: ClariNet Communications Corp
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In article <1996Apr14.094348.2572@kiae.su>, dmoreau@kiae.su (Diego Moreau) 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.

-- 
Marisol Hughes
Opinions expressed are solely my own and not those of ClariNet Communications Corp.
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