From sperez@cmu.edu Wed May 03 22:30:28 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!sperez From: sperez@cmu.edu (Sun-mi Pérez) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May03.223028.4283@cmu.edu> Date: Wed, 03 May 1995 22:30:28 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. 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? -- Sun-mi Pérez -- Carnegie Mellon University School of CS "Row 14. No joke." From oduarte@mindspring.com Thu May 04 12:47:28 1995 Path: ashpoly!cascade!bigsur!mindspring!oduarte From: oduarte@mindspring.com (Olga Duarte) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May04.124728.5133@mindspring.com> Date: Thu, 04 May 1995 12:47:28 GMT References: <1995May03.223028.4283@cmu.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May03.223028.4283@cmu.edu>, sperez@cmu.edu (Sun-mi Pérez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Olga Duarte Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From gsokolov@kiae.su Thu May 04 23:57:28 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!gsokolov From: gsokolov@kiae.su (Göran Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May04.235728.2002@kiae.su> Date: Thu, 04 May 1995 23:57:28 GMT References: <1995May03.223028.4283@cmu.edu> <1995May04.124728.5133@mindspring.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995May04.124728.5133@mindspring.com>, oduarte@mindspring.com (Olga Duarte) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Göran Sokolov -- Kurchatov Institute of Atomic Energy, Moscow "The carrier frequency does not drift by accident." From tsouza@mindspring.com Fri May 05 13:20:28 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!tsouza From: tsouza@mindspring.com (Tyler Souza) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May05.132028.4421@mindspring.com> Date: Fri, 05 May 1995 13:20:28 GMT References: <1995May03.223028.4283@cmu.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May03.223028.4283@cmu.edu>, sperez@cmu.edu (Sun-mi Pérez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- === Tyler Souza === Dept of Electrical Engineering, MindSpring Enterprises "In theory there is no difference between theory and practice." From snovak@pacbell.net Fri May 05 19:37:28 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!snovak From: snovak@pacbell.net (Sven Novak) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May05.193728.4749@pacbell.net> Date: Fri, 05 May 1995 19:37:28 GMT References: <1995May03.223028.4283@cmu.edu> <1995May04.124728.5133@mindspring.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May04.124728.5133@mindspring.com>, oduarte@mindspring.com (Olga Duarte) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Sven Novak "In theory there is no difference between theory and practice." Commodore Amiga 500 (1MB OCS) / FreeBSD 2.1