From mkowalski@panix.com Tue May 02 16:47:22 1995 Path: ashpoly!cascade!mxgate!coyoacan!panix!mkowalski From: mkowalski@panix.com (Matthias Kowalski) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May02.164722.2331@panix.com> Date: Tue, 02 May 1995 16:47:22 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 11 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'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Matthias Kowalski | mkowalski@panix.com PGP Key fingerprint: 444A 4022 3AC5 7A8D "Keep the channels open." From meriksson@kiae.su Wed May 03 11:06:22 1995 Path: ashpoly!cascade!bigsur!kiae!meriksson From: meriksson@kiae.su (Mikhail Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May03.110622.4529@kiae.su> Date: Wed, 03 May 1995 11:06:22 GMT References: <1995May02.164722.2331@panix.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May02.164722.2331@panix.com>, mkowalski@panix.com (Matthias Kowalski) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Mikhail Eriksson Tape trading list upon request. SASE required for international mail. From dmoreau@kiae.su Fri May 05 11:16:22 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!dmoreau From: dmoreau@kiae.su (Diego Moreau) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May05.111622.5728@kiae.su> Date: Fri, 05 May 1995 11:16:22 GMT References: <1995May02.164722.2331@panix.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May02.164722.2331@panix.com>, mkowalski@panix.com (Matthias Kowalski) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Diego Moreau *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From jtanaka@earthlink.net Sun May 07 06:15:22 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!jtanaka From: jtanaka@earthlink.net (Ji-woo Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May07.061522.4712@earthlink.net> Date: Sun, 07 May 1995 06:15:22 GMT References: <1995May02.164722.2331@panix.com> <1995May03.110622.4529@kiae.su> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May03.110622.4529@kiae.su>, meriksson@kiae.su (Mikhail Eriksson) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- === Ji-woo Tanaka === Dept of Electrical Engineering, EarthLink Network "Row 14. No joke." From ssuzuki@uu.net Sun May 07 22:44:22 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!ssuzuki From: ssuzuki@uu.net (Steve Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May07.224422.8044@uu.net> Date: Sun, 07 May 1995 22:44:22 GMT References: <1995May02.164722.2331@panix.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May02.164722.2331@panix.com>, mkowalski@panix.com (Matthias Kowalski) writes: > 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'. Looks like a prototype telecommunications board for military secure voice, not an audio music product. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Steve Suzuki Tape trading list upon request. SASE required for international mail.