From mdubois@earthlink.net Tue Jul 18 19:27:00 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!mdubois From: mdubois@earthlink.net (Mei Dubois) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul18.192700.4895@earthlink.net> Date: Tue, 18 Jul 1995 19:27:00 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Mei Dubois | mdubois@earthlink.net PGP Key fingerprint: B2A1 4CB2 6343 8CEF "Keep the channels open." From dnovak@mindspring.com Wed Jul 19 00:00:00 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!dnovak From: dnovak@mindspring.com (Dong-hyun Novak) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul19.000000.1783@mindspring.com> Date: Wed, 19 Jul 1995 00:00:00 GMT References: <1995Jul18.192700.4895@earthlink.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jul18.192700.4895@earthlink.net>, mdubois@earthlink.net (Mei Dubois) 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. -- Dong-hyun Novak -- MindSpring Enterprises "They will send a copy in my place." From alarsson@kiae.su Thu Jul 20 16:34:00 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!alarsson From: alarsson@kiae.su (Aiko Larsson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul20.163400.4104@kiae.su> Date: Thu, 20 Jul 1995 16:34:00 GMT References: <1995Jul18.192700.4895@earthlink.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Jul18.192700.4895@earthlink.net>, mdubois@earthlink.net (Mei Dubois) writes: > 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. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Aiko Larsson Zyxel U-1496E @ ISDN 64k bps "We don't sign stars. We build them." From lvasiliev@berkeley.edu Thu Jul 20 22:15:00 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!lvasiliev From: lvasiliev@berkeley.edu (Lisa Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul20.221500.8030@berkeley.edu> Date: Thu, 20 Jul 1995 22:15:00 GMT References: <1995Jul18.192700.4895@earthlink.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul18.192700.4895@earthlink.net>, mdubois@earthlink.net (Mei Dubois) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- === Lisa Vasiliev === Dept of Electrical Engineering, UC Berkeley Department of EECS "5 sigma is a discovery. 7 is a question."