From mrobertson@cmu.edu Wed Apr 19 12:45:54 1995 Path: ashpoly!cascade!bigsur!cmu!mrobertson From: mrobertson@cmu.edu (Mei Robertson) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr19.124554.1026@cmu.edu> Date: Wed, 19 Apr 1995 12:45:54 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Mei Robertson === Dept of Electrical Engineering, Carnegie Mellon University School of CS "Extraordinary claims require extraordinary spectra." From jgirard@panix.com Wed Apr 19 20:11:54 1995 Path: ashpoly!cascade!brgate!saturno!panix!jgirard From: jgirard@panix.com (Ji-woo Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr19.201154.5248@panix.com> Date: Wed, 19 Apr 1995 20:11:54 GMT References: <1995Apr19.124554.1026@cmu.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr19.124554.1026@cmu.edu>, mrobertson@cmu.edu (Mei Robertson) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- === Ji-woo Girard === Dept of Electrical Engineering, Public Access Unix of New York "Extraordinary claims require extraordinary spectra." From anilsson@purdue.edu Thu Apr 20 18:39:54 1995 Path: ashpoly!cascade!brgate!saturno!purdue!anilsson From: anilsson@purdue.edu (Anton Nilsson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr20.183954.4639@purdue.edu> Date: Thu, 20 Apr 1995 18:39:54 GMT References: <1995Apr19.124554.1026@cmu.edu> <1995Apr19.201154.5248@panix.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Apr19.201154.5248@panix.com>, jgirard@panix.com (Ji-woo Girard) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Anton Nilsson Hayes Optima 288 @ 9600 Telebit bps "When every node is whole, the channel opens." From bjohansson@illinois.edu Fri Apr 21 00:14:54 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!bjohansson From: bjohansson@illinois.edu (Bill Johansson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr21.001454.1224@illinois.edu> Date: Fri, 21 Apr 1995 00:14:54 GMT References: <1995Apr19.124554.1026@cmu.edu> <1995Apr19.201154.5248@panix.com> <1995Apr20.183954.4639@purdue.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr20.183954.4639@purdue.edu>, anilsson@purdue.edu (Anton Nilsson) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Bill Johansson SupraFAXModem 28.8 @ 33,600 bps "The carrier frequency does not drift by accident." From mjohansson@kiae.su Fri Apr 21 03:45:54 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!mjohansson From: mjohansson@kiae.su (Morag Johansson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr21.034554.2051@kiae.su> Date: Fri, 21 Apr 1995 03:45:54 GMT References: <1995Apr19.124554.1026@cmu.edu> <1995Apr19.201154.5248@panix.com> <1995Apr20.183954.4639@purdue.edu> <1995Apr21.001454.1224@illinois.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr21.001454.1224@illinois.edu>, bjohansson@illinois.edu (Bill Johansson) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Morag Johansson | mjohansson@kiae.su PGP Key fingerprint: 5516 ADE6 397B 6B2C "Keep the channels open."