From blopez@delphi.com Sun Nov 12 11:39:50 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!delphi!blopez
From: blopez@delphi.com (Bill López)
Newsgroups: comp.sys.m68k
Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov12.113950.1160@delphi.com>
Date: Sun, 12 Nov 1995 11:39:50 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.
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?

-- 
Bill López
Tape trading list upon request. SASE required for international mail.

From aramirez@clari.net Mon Nov 13 04:37:50 1995
Path: ashpoly!cascade!bigsur!clari!aramirez
From: aramirez@clari.net (Anton Ramírez)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov13.043750.8551@clari.net>
Date: Mon, 13 Nov 1995 04:37:50 GMT
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In article <1995Nov12.113950.1160@delphi.com>, blopez@delphi.com (Bill López) writes:
> Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look.

The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

-- 
Anton Ramírez
Tape trading list upon request. SASE required for international mail.

From smartinez@titech.ac.jp Wed Nov 15 00:04:50 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!smartinez
From: smartinez@titech.ac.jp (Sven Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov15.000450.9356@titech.ac.jp>
Date: Wed, 15 Nov 1995 00:04:50 GMT
References: <1995Nov12.113950.1160@delphi.com>
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In article <1995Nov12.113950.1160@delphi.com>, blopez@delphi.com (Bill López) writes:
> 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.

Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen.

-- 
Sven Martínez
Tape trading list upon request. SASE required for international mail.

From boliveira@pipeline.com Fri Nov 17 02:14:50 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!boliveira
From: boliveira@pipeline.com (Bill Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Nov17.021450.4632@pipeline.com>
Date: Fri, 17 Nov 1995 02:14:50 GMT
References: <1995Nov12.113950.1160@delphi.com> <1995Nov13.043750.8551@clari.net>
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In article <1995Nov13.043750.8551@clari.net>, aramirez@clari.net (Anton Ramírez) writes:
> The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM.

-- 
Bill Oliveira
Tape trading list upon request. SASE required for international mail.