From mmoreno@cmu.edu Mon Mar 25 15:40:23 1996 Path: ashpoly!cascade!brgate!saturno!cmu!mmoreno From: mmoreno@cmu.edu (Marisol Moreno) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar25.154023.3592@cmu.edu> Date: Mon, 25 Mar 1996 15:40:23 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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'. 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. -- Marisol Moreno -- Carnegie Mellon University School of CS "A soul is not exclusive to biology." From bsuzuki@utexas.edu Mon Mar 25 18:15:23 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!bsuzuki From: bsuzuki@utexas.edu (Bruno Suzuki) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar25.181523.1494@utexas.edu> Date: Mon, 25 Mar 1996 18:15:23 GMT References: <1996Mar25.154023.3592@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Mar25.154023.3592@cmu.edu>, mmoreno@cmu.edu (Marisol Moreno) 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'. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Bruno Suzuki "Row 14. No joke." Sun 3/60 (SunOS 4.1.1) / AmigaOS 3.1