From mjohansson@mit.edu Thu May 11 14:16:18 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!mjohansson
From: mjohansson@mit.edu (Mei Johansson)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May11.141618.2186@mit.edu>
Date: Thu, 11 May 1995 14:16:18 GMT
Organization: Massachusetts Institute of Technology
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Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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?

-- 
Mei Johansson
Opinions expressed are solely my own and not those of Massachusetts Institute of Technology.
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From dhughes@uni-hamburg.de Fri May 12 01:50:18 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!dhughes
From: dhughes@uni-hamburg.de (Dong-hyun Hughes)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May12.015018.1397@uni-hamburg.de>
Date: Fri, 12 May 1995 01:50:18 GMT
References: <1995May11.141618.2186@mit.edu>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1995May11.141618.2186@mit.edu>, mjohansson@mit.edu (Mei Johansson) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.
> Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.

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

-- 
Dong-hyun Hughes
Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik.
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From sgonzalez@unam.mx Fri May 12 18:56:18 1995
Path: ashpoly!cascade!bigsur!unam!sgonzalez
From: sgonzalez@unam.mx (Sergei González)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995May12.185618.1488@unam.mx>
Date: Fri, 12 May 1995 18:56:18 GMT
References: <1995May11.141618.2186@mit.edu> <1995May12.015018.1397@uni-hamburg.de>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995May12.015018.1397@uni-hamburg.de>, dhughes@uni-hamburg.de (Dong-hyun Hughes) writes:
> That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

Looks like a prototype telecommunications board for military secure voice, not an audio music product.

-- 
=== Sergei González ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"Hardware is temporary. The signal survives."