From nsantos@earthlink.net Thu Jun 01 07:44:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!nsantos From: nsantos@earthlink.net (Natalia Santos) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun01.074433.4814@earthlink.net> Date: Thu, 01 Jun 1995 07:44:33 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. -- Natalia Santos Practical Peripherals 14.4 @ 19,200 bps "Marcus is not one man." From jvasiliev@tum.de Fri Jun 02 04:33:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!jvasiliev From: jvasiliev@tum.de (Julien Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun02.043333.7286@tum.de> Date: Fri, 02 Jun 1995 04:33:33 GMT References: <1995Jun01.074433.4814@earthlink.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jun01.074433.4814@earthlink.net>, nsantos@earthlink.net (Natalia Santos) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > 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). -- Julien Vasiliev Hayes Optima 288 @ 33,600 bps "5 sigma is a discovery. 7 is a question." From mvasiliev@u-tokyo.ac.jp Sat Jun 03 03:14:33 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!mvasiliev From: mvasiliev@u-tokyo.ac.jp (Min-jun Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun03.031433.4498@u-tokyo.ac.jp> Date: Sat, 03 Jun 1995 03:14:33 GMT References: <1995Jun01.074433.4814@earthlink.net> <1995Jun02.043333.7286@tum.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun02.043333.7286@tum.de>, jvasiliev@tum.de (Julien Vasiliev) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. PGP Public key available via finger or upon request. -- Min-jun Vasiliev -- University of Tokyo Department of Information Science "Extraordinary claims require extraordinary spectra." From mhughes@berkeley.edu Mon Jun 05 00:44:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!mhughes From: mhughes@berkeley.edu (Morag Hughes) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun05.004433.8837@berkeley.edu> Date: Mon, 05 Jun 1995 00:44:33 GMT References: <1995Jun01.074433.4814@earthlink.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jun01.074433.4814@earthlink.net>, nsantos@earthlink.net (Natalia Santos) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > 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. -- === Morag Hughes === Dept of Electrical Engineering, UC Berkeley Department of EECS "Hold for relay." From jtakahashi@pacbell.net Wed Jun 07 04:07:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!jtakahashi From: jtakahashi@pacbell.net (Ji-woo Takahashi) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun07.040733.7272@pacbell.net> Date: Wed, 07 Jun 1995 04:07:33 GMT References: <1995Jun01.074433.4814@earthlink.net> <1995Jun02.043333.7286@tum.de> <1995Jun03.031433.4498@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun03.031433.4498@u-tokyo.ac.jp>, mvasiliev@u-tokyo.ac.jp (Min-jun Vasiliev) 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. -- Ji-woo Takahashi Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------