From msouza@clari.net Fri May 24 14:04:57 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!msouza From: msouza@clari.net (Mateo Souza) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May24.140457.8967@clari.net> Date: Fri, 24 May 1996 14:04:57 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net 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. 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. -- Mateo Souza Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From kokonkwo@purdue.edu Sun May 26 02:19:57 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!kokonkwo From: kokonkwo@purdue.edu (Katrin Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May26.021957.3638@purdue.edu> Date: Sun, 26 May 1996 02:19:57 GMT References: <1996May24.140457.8967@clari.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May24.140457.8967@clari.net>, msouza@clari.net (Mateo Souza) 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. -- Katrin Okonkwo Zyxel U-1496E @ 9600 Telebit bps "In theory there is no difference between theory and practice." From mweber@tum.de Mon May 27 13:42:57 1996 Path: ashpoly!cascade!mxgate!coyoacan!tum!mweber From: mweber@tum.de (Marta Weber) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May27.134257.1613@tum.de> Date: Mon, 27 May 1996 13:42:57 GMT References: <1996May24.140457.8967@clari.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996May24.140457.8967@clari.net>, msouza@clari.net (Mateo Souza) 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. -- Marta Weber Tape trading list upon request. SASE required for international mail. From rlopez@panix.com Tue May 28 23:46:57 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!rlopez From: rlopez@panix.com (Raj López) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May28.234657.1184@panix.com> Date: Tue, 28 May 1996 23:46:57 GMT References: <1996May24.140457.8967@clari.net> <1996May26.021957.3638@purdue.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996May26.021957.3638@purdue.edu>, kokonkwo@purdue.edu (Katrin Okonkwo) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. PGP Public key available via finger or upon request. -- Raj López | rlopez@panix.com PGP Key fingerprint: 2655 57E4 754B 5572 "Keep the channels open."