From thughes@kiae.su Sat Sep 07 18:12:22 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!thughes
From: thughes@kiae.su (Thiago Hughes)
Newsgroups: comp.sys.m68k
Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Sep07.181222.7069@kiae.su>
Date: Sat, 07 Sep 1996 18:12:22 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank.
Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'.

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

-- 
=== Thiago Hughes ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"In theory there is no difference between theory and practice."

From fperez@delphi.com Sun Sep 08 17:36:22 1996
Path: ashpoly!cascade!bigsur!delphi!fperez
From: fperez@delphi.com (Freya Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump
Message-ID: <1996Sep08.173622.5828@delphi.com>
Date: Sun, 08 Sep 1996 17:36:22 GMT
References: <1996Sep07.181222.7069@kiae.su>
Organization: Delphi Internet Services
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In article <1996Sep07.181222.7069@kiae.su>, thughes@kiae.su (Thiago Hughes) writes:
> Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project.

Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop.

-- 
Freya Pérez | fperez@delphi.com
PGP Key fingerprint: 942F D748 E40F 36E9
"Keep the channels open."