From jhughes@pipeline.com Thu Jul 28 13:40:57 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!jhughes
From: jhughes@pipeline.com (Ji-woo Hughes)
Newsgroups: comp.sys.m68k
Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Jul28.134057.5263@pipeline.com>
Date: Thu, 28 Jul 1994 13:40:57 GMT
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Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII.
The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

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

-- 
Ji-woo Hughes
Tape trading list upon request. SASE required for international mail.

From esokolov@mindspring.com Fri Jul 29 15:37:57 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!esokolov
From: esokolov@mindspring.com (Elaine Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1994Jul29.153757.3985@mindspring.com>
Date: Fri, 29 Jul 1994 15:37:57 GMT
References: <1994Jul28.134057.5263@pipeline.com>
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In article <1994Jul28.134057.5263@pipeline.com>, jhughes@pipeline.com (Ji-woo Hughes) writes:
> Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly.

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

-- 
Elaine Sokolov -- MindSpring Enterprises
"Hold for relay."