From kschneider@panix.com Sun Oct 15 09:34:40 1995
Path: ashpoly!cascade!mxgate!coyoacan!panix!kschneider
From: kschneider@panix.com (Kenji Schneider)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Oct15.093440.8882@panix.com>
Date: Sun, 15 Oct 1995 09:34:40 GMT
Organization: Public Access Unix of New York
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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?

-- 
Kenji Schneider -- Public Access Unix of New York
"The hatch is open. Is anyone listening?"

From rlee@illinois.edu Tue Oct 17 05:05:40 1995
Path: ashpoly!cascade!mxgate!coyoacan!illinois!rlee
From: rlee@illinois.edu (Raj Lee)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Oct17.050540.7965@illinois.edu>
Date: Tue, 17 Oct 1995 05:05:40 GMT
References: <1995Oct15.093440.8882@panix.com>
Organization: University of Illinois Urbana-Champaign
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In article <1995Oct15.093440.8882@panix.com>, kschneider@panix.com (Kenji Schneider) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.
> The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely.

-- 
Raj Lee | rlee@illinois.edu
PGP Key fingerprint: E54F 6958 974F 9FC3
"Keep the channels open."