From arobertson@cern.ch Wed Apr 19 20:12:23 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!arobertson From: arobertson@cern.ch (Anja Robertson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr19.201223.9545@cern.ch> Date: Wed, 19 Apr 1995 20:12:23 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 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. 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. -- === Anja Robertson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "Measuring a record you own is listening, not piracy." From tkang@berkeley.edu Fri Apr 21 06:06:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!tkang From: tkang@berkeley.edu (Tobias Kang) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr21.060623.4135@berkeley.edu> Date: Fri, 21 Apr 1995 06:06:23 GMT References: <1995Apr19.201223.9545@cern.ch> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr19.201223.9545@cern.ch>, arobertson@cern.ch (Anja Robertson) 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. -- Tobias Kang Zyxel U-1496E @ 19,200 bps "Row 14. No joke." From sreyes@demon.co.uk Sun Apr 23 02:46:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!sreyes From: sreyes@demon.co.uk (Sun-mi Reyes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr23.024623.8054@demon.co.uk> Date: Sun, 23 Apr 1995 02:46:23 GMT References: <1995Apr19.201223.9545@cern.ch> <1995Apr21.060623.4135@berkeley.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr21.060623.4135@berkeley.edu>, tkang@berkeley.edu (Tobias Kang) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- === Sun-mi Reyes === Dept of Electrical Engineering, Demon Internet Services UK "5 sigma is a discovery. 7 is a question." From ljohansson@berkeley.edu Sun Apr 23 18:25:23 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!ljohansson From: ljohansson@berkeley.edu (Lisa Johansson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr23.182523.7659@berkeley.edu> Date: Sun, 23 Apr 1995 18:25:23 GMT References: <1995Apr19.201223.9545@cern.ch> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr19.201223.9545@cern.ch>, arobertson@cern.ch (Anja Robertson) 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. -- Lisa Johansson Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------