From msilva@cam.ac.uk Sat Apr 22 22:38:55 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!msilva
From: msilva@cam.ac.uk (Min-jun Silva)
Newsgroups: comp.sys.m68k
Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Apr22.223855.5006@cam.ac.uk>
Date: Sat, 22 Apr 1995 22:38:55 GMT
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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.
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?

-- 
=== Min-jun Silva ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"There are 14 nodes and only 10 countries. Count again."

From mduarte@utexas.edu Sun Apr 23 23:50:55 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!mduarte
From: mduarte@utexas.edu (Mei Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Apr23.235055.3553@utexas.edu>
Date: Sun, 23 Apr 1995 23:50:55 GMT
References: <1995Apr22.223855.5006@cam.ac.uk>
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In article <1995Apr22.223855.5006@cam.ac.uk>, msilva@cam.ac.uk (Min-jun Silva) 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.

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
Mei Duarte -- University of Texas at Austin
"Extraordinary claims require extraordinary spectra."