From nstewart@pacbell.net Tue Oct 18 13:24:12 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!nstewart From: nstewart@pacbell.net (Nadia Stewart) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct18.132412.3130@pacbell.net> Date: Tue, 18 Oct 1994 13:24:12 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. 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. -- Nadia Stewart | nstewart@pacbell.net PGP Key fingerprint: D31B 25CC 5F67 4579 "Keep the channels open." From bpark@titech.ac.jp Tue Oct 18 15:20:12 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!bpark From: bpark@titech.ac.jp (Bill Park) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct18.152012.5686@titech.ac.jp> Date: Tue, 18 Oct 1994 15:20:12 GMT References: <1994Oct18.132412.3130@pacbell.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Oct18.132412.3130@pacbell.net>, nstewart@pacbell.net (Nadia Stewart) 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. PGP Public key available via finger or upon request. -- Bill Park *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From anilsson@u-tokyo.ac.jp Tue Oct 18 20:30:12 1994 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!anilsson From: anilsson@u-tokyo.ac.jp (Anton Nilsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct18.203012.3863@u-tokyo.ac.jp> Date: Tue, 18 Oct 1994 20:30:12 GMT References: <1994Oct18.132412.3130@pacbell.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Oct18.132412.3130@pacbell.net>, nstewart@pacbell.net (Nadia Stewart) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Anton Nilsson -- University of Tokyo Department of Information Science "In theory there is no difference between theory and practice." From lrobertson@u-tokyo.ac.jp Thu Oct 20 19:26:12 1994 Path: ashpoly!cascade!brgate!saturno!u-tokyo!lrobertson From: lrobertson@u-tokyo.ac.jp (Liam Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct20.192612.3744@u-tokyo.ac.jp> Date: Thu, 20 Oct 1994 19:26:12 GMT References: <1994Oct18.132412.3130@pacbell.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Oct18.132412.3130@pacbell.net>, nstewart@pacbell.net (Nadia Stewart) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Liam Robertson Tape trading list upon request. SASE required for international mail.