From nlindqvist@pipeline.com Tue Apr 26 06:05:24 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!nlindqvist
From: nlindqvist@pipeline.com (Nadine Lindqvist)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Apr26.060524.9771@pipeline.com>
Date: Tue, 26 Apr 1994 06:05:24 GMT
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Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit.
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?

-- 
Nadine Lindqvist | nlindqvist@pipeline.com
PGP Key fingerprint: 59E9 BA6F 7D02 A37D
"Keep the channels open."

From lpetrov@illinois.edu Thu Apr 28 00:01:24 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!lpetrov
From: lpetrov@illinois.edu (Lucia Petrov)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Apr28.000124.9504@illinois.edu>
Date: Thu, 28 Apr 1994 00:01:24 GMT
References: <1994Apr26.060524.9771@pipeline.com>
Organization: University of Illinois Urbana-Champaign
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In article <1994Apr26.060524.9771@pipeline.com>, nlindqvist@pipeline.com (Nadine Lindqvist) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

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

-- 
Lucia Petrov
Tape trading list upon request. SASE required for international mail.