From lmuller@demon.co.uk Wed Dec 07 04:30:15 1994 Path: ashpoly!cascade!bigsur!demon!lmuller From: lmuller@demon.co.uk (Lars Müller) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec07.043015.8041@demon.co.uk> Date: Wed, 07 Dec 1994 04:30:15 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Lars Müller -- Demon Internet Services UK "Extraordinary claims require extraordinary spectra." From bschneider@kth.se Thu Dec 08 06:31:15 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kth!bschneider From: bschneider@kth.se (Bruno Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec08.063115.6679@kth.se> Date: Thu, 08 Dec 1994 06:31:15 GMT References: <1994Dec07.043015.8041@demon.co.uk> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec07.043015.8041@demon.co.uk>, lmuller@demon.co.uk (Lars Müller) 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. -- Bruno Schneider "5 sigma is a discovery. 7 is a question." Amiga 1200 (Blizzard 030/50) / TOS 4.04