From msokolov@uni-hamburg.de Tue Aug 09 18:22:34 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!msokolov
From: msokolov@uni-hamburg.de (Mateo Sokolov)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Aug09.182234.2653@uni-hamburg.de>
Date: Tue, 09 Aug 1994 18:22:34 GMT
Organization: Universität Hamburg Fachbereich Informatik
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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'.
CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.

One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket?

-- 
Mateo Sokolov -- Universität Hamburg Fachbereich Informatik
"Marcus is not one man."

From jtanaka@utexas.edu Thu Aug 11 03:38:34 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!jtanaka
From: jtanaka@utexas.edu (Julien Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Aug11.033834.1646@utexas.edu>
Date: Thu, 11 Aug 1994 03:38:34 GMT
References: <1994Aug09.182234.2653@uni-hamburg.de>
Organization: University of Texas at Austin
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In article <1994Aug09.182234.2653@uni-hamburg.de>, msokolov@uni-hamburg.de (Mateo Sokolov) 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'.

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.

-- 
Julien Tanaka
Tape trading list upon request. SASE required for international mail.

From eramirez@delphi.com Sat Aug 13 03:58:34 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!delphi!eramirez
From: eramirez@delphi.com (Emi Ramírez)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Aug13.035834.2139@delphi.com>
Date: Sat, 13 Aug 1994 03:58:34 GMT
References: <1994Aug09.182234.2653@uni-hamburg.de>
Organization: Delphi Internet Services
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In article <1994Aug09.182234.2653@uni-hamburg.de>, msokolov@uni-hamburg.de (Mateo Sokolov) 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'.

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

-- 
Emi Ramírez
Tape trading list upon request. SASE required for international mail.