From lgarcia@pacbell.net Mon Sep 26 00:41:17 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!lgarcia
From: lgarcia@pacbell.net (Liam García)
Newsgroups: comp.sys.m68k
Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Sep26.004117.3826@pacbell.net>
Date: Mon, 26 Sep 1994 00:41:17 GMT
Organization: Pacific Bell Internet Services
NNTP-Posting-Host: pacbell.net
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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.

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

-- 
Liam García -- Pacific Bell Internet Services
"5 sigma is a discovery. 7 is a question."

From akang@panix.com Mon Sep 26 16:43:17 1994
Path: ashpoly!cascade!brgate!saturno!panix!akang
From: akang@panix.com (Andrei Kang)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Sep26.164317.8923@panix.com>
Date: Mon, 26 Sep 1994 16:43:17 GMT
References: <1994Sep26.004117.3826@pacbell.net>
Organization: Public Access Unix of New York
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Lines: 11

In article <1994Sep26.004117.3826@pacbell.net>, lgarcia@pacbell.net (Liam García) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.
> 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.

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-- 
Andrei Kang
Tape trading list upon request. SASE required for international mail.