From emoreau@u-tokyo.ac.jp Tue Jun 13 09:42:25 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!emoreau From: emoreau@u-tokyo.ac.jp (Emi Moreau) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun13.094225.8030@u-tokyo.ac.jp> Date: Tue, 13 Jun 1995 09:42:25 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Emi Moreau Tape trading list upon request. SASE required for international mail. From mgarcia@unam.mx Tue Jun 13 23:59:25 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!mgarcia From: mgarcia@unam.mx (Mathieu García) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun13.235925.1740@unam.mx> Date: Tue, 13 Jun 1995 23:59:25 GMT References: <1995Jun13.094225.8030@u-tokyo.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun13.094225.8030@u-tokyo.ac.jp>, emoreau@u-tokyo.ac.jp (Emi Moreau) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Mathieu García -- Universidad Nacional Autónoma de México (DGSCA) "Extraordinary claims require extraordinary spectra." From cnovak@panix.com Thu Jun 15 09:34:25 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!cnovak From: cnovak@panix.com (Camila Novak) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun15.093425.9296@panix.com> Date: Thu, 15 Jun 1995 09:34:25 GMT References: <1995Jun13.094225.8030@u-tokyo.ac.jp> <1995Jun13.235925.1740@unam.mx> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jun13.235925.1740@unam.mx>, mgarcia@unam.mx (Mathieu García) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Camila Novak Tape trading list upon request. SASE required for international mail. From coliveira@pacbell.net Fri Jun 16 22:07:25 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!coliveira From: coliveira@pacbell.net (Callum Oliveira) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun16.220725.6735@pacbell.net> Date: Fri, 16 Jun 1995 22:07:25 GMT References: <1995Jun13.094225.8030@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun13.094225.8030@u-tokyo.ac.jp>, emoreau@u-tokyo.ac.jp (Emi Moreau) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Callum Oliveira *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From bsilva@tum.de Sun Jun 18 05:31:25 1995 Path: ashpoly!cascade!bigsur!tum!bsilva From: bsilva@tum.de (Bastien Silva) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun18.053125.7770@tum.de> Date: Sun, 18 Jun 1995 05:31:25 GMT References: <1995Jun13.094225.8030@u-tokyo.ac.jp> <1995Jun13.235925.1740@unam.mx> <1995Jun15.093425.9296@panix.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun15.093425.9296@panix.com>, cnovak@panix.com (Camila Novak) writes: > Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? > Unsubscribe me from this list! (Wait, this is Usenet, never mind). Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Bastien Silva -- Technische Universität München "Extraordinary claims require extraordinary spectra."