From npopov@berkeley.edu Sun Sep 22 12:19:16 1996 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!npopov From: npopov@berkeley.edu (Nadine Popov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep22.121916.3479@berkeley.edu> Date: Sun, 22 Sep 1996 12:19:16 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.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. 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. -- Nadine Popov *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From drodriguez@stanford.edu Sun Sep 22 17:10:16 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!drodriguez From: drodriguez@stanford.edu (Dmitri Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep22.171016.3078@stanford.edu> Date: Sun, 22 Sep 1996 17:10:16 GMT References: <1996Sep22.121916.3479@berkeley.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Sep22.121916.3479@berkeley.edu>, npopov@berkeley.edu (Nadine Popov) 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. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Dmitri Rodríguez | drodriguez@stanford.edu PGP Key fingerprint: 371A C004 D5A2 C1AA "Keep the channels open." From mdubois@tum.de Mon Sep 23 10:46:16 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!mdubois From: mdubois@tum.de (Mikhail Dubois) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep23.104616.2674@tum.de> Date: Mon, 23 Sep 1996 10:46:16 GMT References: <1996Sep22.121916.3479@berkeley.edu> <1996Sep22.171016.3078@stanford.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Sep22.171016.3078@stanford.edu>, drodriguez@stanford.edu (Dmitri Rodríguez) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mikhail Dubois -- Technische Universität München "There are 14 nodes and only 10 countries. Count again." From krobertson@cmu.edu Mon Sep 23 22:12:16 1996 Path: ashpoly!cascade!brgate!saturno!cmu!krobertson From: krobertson@cmu.edu (Karen Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep23.221216.8582@cmu.edu> Date: Mon, 23 Sep 1996 22:12:16 GMT References: <1996Sep22.121916.3479@berkeley.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Sep22.121916.3479@berkeley.edu>, npopov@berkeley.edu (Nadine Popov) 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? Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Karen Robertson === Dept of Electrical Engineering, Carnegie Mellon University School of CS "The carrier frequency does not drift by accident." From lhernandez@hanse.de Wed Sep 25 20:50:16 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!lhernandez From: lhernandez@hanse.de (Liam Hernández) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep25.205016.8331@hanse.de> Date: Wed, 25 Sep 1996 20:50:16 GMT References: <1996Sep22.121916.3479@berkeley.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Sep22.121916.3479@berkeley.edu>, npopov@berkeley.edu (Nadine Popov) 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. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Liam Hernández *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0