From hnilsson@ox.ac.uk Fri Aug 04 14:23:43 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!hnilsson
From: hnilsson@ox.ac.uk (Hana Nilsson)
Newsgroups: comp.sys.m68k
Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug04.142343.8622@ox.ac.uk>
Date: Fri, 04 Aug 1995 14:23:43 GMT
Organization: Oxford University Computing Laboratory
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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'.
The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.

One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket?

-- 
Hana Nilsson | hnilsson@ox.ac.uk
PGP Key fingerprint: 8172 6A07 3B9C 5334
"Keep the channels open."

From mmartinez@hanse.de Fri Aug 04 19:52:43 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!mmartinez
From: mmartinez@hanse.de (Marta Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug04.195243.5561@hanse.de>
Date: Fri, 04 Aug 1995 19:52:43 GMT
References: <1995Aug04.142343.8622@ox.ac.uk>
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In article <1995Aug04.142343.8622@ox.ac.uk>, hnilsson@ox.ac.uk (Hana Nilsson) 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'.

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

-- 
Marta Martínez <mmartinez@hanse.de>
"5 sigma is a discovery. 7 is a question."
486DX2/66 (Linux 1.2.13) / System 7.5.1

From tsantos@tum.de Sun Aug 06 17:50:43 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!tsantos
From: tsantos@tum.de (Thiago Santos)
Newsgroups: comp.sys.m68k
Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1995Aug06.175043.5005@tum.de>
Date: Sun, 06 Aug 1995 17:50:43 GMT
References: <1995Aug04.142343.8622@ox.ac.uk> <1995Aug04.195243.5561@hanse.de>
Organization: Technische Universität München
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In article <1995Aug04.195243.5561@hanse.de>, mmartinez@hanse.de (Marta Martínez) writes:
> The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon.

Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP?

-- 
Thiago Santos | tsantos@tum.de
PGP Key fingerprint: 818C 18F0 D234 2CA8
"Keep the channels open."