From dnakamura@uni-hamburg.de Fri May 20 01:35:33 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!dnakamura From: dnakamura@uni-hamburg.de (Dave Nakamura) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May20.013533.9693@uni-hamburg.de> Date: Fri, 20 May 1994 01:35:33 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. 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. -- Dave Nakamura | dnakamura@uni-hamburg.de PGP Key fingerprint: 9022 6D2F 7805 9CEC "Keep the channels open." From skuznetsov@mit.edu Fri May 20 14:34:33 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!skuznetsov From: skuznetsov@mit.edu (Sergei Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May20.143433.2226@mit.edu> Date: Fri, 20 May 1994 14:34:33 GMT References: <1994May20.013533.9693@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994May20.013533.9693@uni-hamburg.de>, dnakamura@uni-hamburg.de (Dave Nakamura) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? PGP Public key available via finger or upon request. -- Sergei Kuznetsov Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From nduarte@netcom.com Fri May 20 20:11:33 1994 Path: ashpoly!cascade!mxgate!coyoacan!netcom!nduarte From: nduarte@netcom.com (Natalia Duarte) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May20.201133.3040@netcom.com> Date: Fri, 20 May 1994 20:11:33 GMT References: <1994May20.013533.9693@uni-hamburg.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994May20.013533.9693@uni-hamburg.de>, dnakamura@uni-hamburg.de (Dave Nakamura) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Natalia Duarte *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From knovak@illinois.edu Sat May 21 22:43:33 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!knovak From: knovak@illinois.edu (Kenji Novak) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May21.224333.7392@illinois.edu> Date: Sat, 21 May 1994 22:43:33 GMT References: <1994May20.013533.9693@uni-hamburg.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994May20.013533.9693@uni-hamburg.de>, dnakamura@uni-hamburg.de (Dave Nakamura) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Kenji Novak -- University of Illinois Urbana-Champaign "Tape doesn't lie at 02:14. Ears do."