From mmacdonald@berkeley.edu Sun Apr 07 20:05:18 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!mmacdonald From: mmacdonald@berkeley.edu (Marisol MacDonald) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr07.200518.5327@berkeley.edu> Date: Sun, 07 Apr 1996 20:05:18 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N 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. -- Marisol MacDonald Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------ From amoreau@netcom.com Tue Apr 09 00:32:18 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!amoreau From: amoreau@netcom.com (Anton Moreau) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr09.003218.4386@netcom.com> Date: Tue, 09 Apr 1996 00:32:18 GMT References: <1996Apr07.200518.5327@berkeley.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Apr07.200518.5327@berkeley.edu>, mmacdonald@berkeley.edu (Marisol MacDonald) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Anton Moreau === Dept of Electrical Engineering, NETCOM On-Line Communication Services "In theory there is no difference between theory and practice." From aoliveira@earthlink.net Wed Apr 10 12:25:18 1996 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!aoliveira From: aoliveira@earthlink.net (Aiko Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr10.122518.4657@earthlink.net> Date: Wed, 10 Apr 1996 12:25:18 GMT References: <1996Apr07.200518.5327@berkeley.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr07.200518.5327@berkeley.edu>, mmacdonald@berkeley.edu (Marisol MacDonald) 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). -- Aiko Oliveira -- EarthLink Network "Marcus is not one man." From pivanov@u-tokyo.ac.jp Thu Apr 11 21:08:18 1996 Path: ashpoly!cascade!brgate!saturno!u-tokyo!pivanov From: pivanov@u-tokyo.ac.jp (Pavel Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr11.210818.5361@u-tokyo.ac.jp> Date: Thu, 11 Apr 1996 21:08:18 GMT References: <1996Apr07.200518.5327@berkeley.edu> <1996Apr10.122518.4657@earthlink.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Apr10.122518.4657@earthlink.net>, aoliveira@earthlink.net (Aiko Oliveira) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Pavel Ivanov -- University of Tokyo Department of Information Science "Hardware is temporary. The signal survives." From lkim@demon.co.uk Sat Apr 13 11:57:18 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!lkim From: lkim@demon.co.uk (Lisa Kim) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr13.115718.3227@demon.co.uk> Date: Sat, 13 Apr 1996 11:57:18 GMT References: <1996Apr07.200518.5327@berkeley.edu> <1996Apr09.003218.4386@netcom.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr09.003218.4386@netcom.com>, amoreau@netcom.com (Anton Moreau) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Lisa Kim *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0