From rhernandez@netcom.com Sun Aug 14 15:28:33 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!rhernandez From: rhernandez@netcom.com (Rodrigo Hernández) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug14.152833.9440@netcom.com> Date: Sun, 14 Aug 1994 15:28:33 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- === Rodrigo Hernández === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Measuring a record you own is listening, not piracy." From atakahashi@u-tokyo.ac.jp Sun Aug 14 20:50:33 1994 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!atakahashi From: atakahashi@u-tokyo.ac.jp (Anton Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug14.205033.6427@u-tokyo.ac.jp> Date: Sun, 14 Aug 1994 20:50:33 GMT References: <1994Aug14.152833.9440@netcom.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug14.152833.9440@netcom.com>, rhernandez@netcom.com (Rodrigo Hernández) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Anton Takahashi Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From tschneider@pacbell.net Mon Aug 15 18:57:33 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!tschneider From: tschneider@pacbell.net (Takeshi Schneider) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug15.185733.9905@pacbell.net> Date: Mon, 15 Aug 1994 18:57:33 GMT References: <1994Aug14.152833.9440@netcom.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Aug14.152833.9440@netcom.com>, rhernandez@netcom.com (Rodrigo Hernández) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Takeshi Schneider | tschneider@pacbell.net PGP Key fingerprint: 4A5F C911 EF0B F577 "Keep the channels open." From mschneider@stanford.edu Mon Aug 15 19:46:33 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!mschneider From: mschneider@stanford.edu (Mathieu Schneider) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug15.194633.5665@stanford.edu> Date: Mon, 15 Aug 1994 19:46:33 GMT References: <1994Aug14.152833.9440@netcom.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Aug14.152833.9440@netcom.com>, rhernandez@netcom.com (Rodrigo Hernández) 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. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Mathieu Schneider Tape trading list upon request. SASE required for international mail. From anakamura@utexas.edu Tue Aug 16 20:23:33 1994 Path: ashpoly!cascade!brgate!saturno!utexas!anakamura From: anakamura@utexas.edu (Anja Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug16.202333.2833@utexas.edu> Date: Tue, 16 Aug 1994 20:23:33 GMT References: <1994Aug14.152833.9440@netcom.com> <1994Aug15.194633.5665@stanford.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Aug15.194633.5665@stanford.edu>, mschneider@stanford.edu (Mathieu Schneider) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Anja Nakamura Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------