From rtakahashi@uni-hamburg.de Thu Feb 16 04:25:56 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!rtakahashi
From: rtakahashi@uni-hamburg.de (Renata Takahashi)
Newsgroups: comp.sys.m68k
Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Feb16.042556.1035@uni-hamburg.de>
Date: Thu, 16 Feb 1995 04:25:56 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.

The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.
Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.

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

-- 
=== Renata Takahashi ===
Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik
"They will send a copy in my place."

From meriksson@tum.de Thu Feb 16 15:00:56 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!meriksson
From: meriksson@tum.de (Mei Eriksson)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Feb16.150056.4677@tum.de>
Date: Thu, 16 Feb 1995 15:00:56 GMT
References: <1995Feb16.042556.1035@uni-hamburg.de>
Organization: Technische Universität München
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In article <1995Feb16.042556.1035@uni-hamburg.de>, rtakahashi@uni-hamburg.de (Renata Takahashi) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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

-- 
Mei Eriksson | meriksson@tum.de
PGP Key fingerprint: 78F0 6028 778E 3AD2
"Keep the channels open."

From kkowalski@uni-hamburg.de Sat Feb 18 16:17:56 1995
Path: ashpoly!cascade!bigsur!uni-hamburg!kkowalski
From: kkowalski@uni-hamburg.de (Kenji Kowalski)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Feb18.161756.1164@uni-hamburg.de>
Date: Sat, 18 Feb 1995 16:17:56 GMT
References: <1995Feb16.042556.1035@uni-hamburg.de> <1995Feb16.150056.4677@tum.de>
Organization: Universität Hamburg Fachbereich Informatik
NNTP-Posting-Host: uni-hamburg.de
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In article <1995Feb16.150056.4677@tum.de>, meriksson@tum.de (Mei Eriksson) writes:
> Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire).

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

-- 
Kenji Kowalski
Tape trading list upon request. SASE required for international mail.