From djohansson@cam.ac.uk Mon Sep 18 08:04:46 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!djohansson From: djohansson@cam.ac.uk (Dmitri Johansson) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep18.080446.4005@cam.ac.uk> Date: Mon, 18 Sep 1995 08:04:46 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Dmitri Johansson Tape trading list upon request. SASE required for international mail. From hsmirnov@pipeline.com Mon Sep 18 22:42:46 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!hsmirnov From: hsmirnov@pipeline.com (Hana Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep18.224246.5716@pipeline.com> Date: Mon, 18 Sep 1995 22:42:46 GMT References: <1995Sep18.080446.4005@cam.ac.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep18.080446.4005@cam.ac.uk>, djohansson@cam.ac.uk (Dmitri Johansson) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Hana Smirnov | hsmirnov@pipeline.com PGP Key fingerprint: AA7C 32B6 0D46 49F2 "Keep the channels open." From mnakamura@unam.mx Tue Sep 19 03:12:46 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!mnakamura From: mnakamura@unam.mx (Mathieu Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep19.031246.5463@unam.mx> Date: Tue, 19 Sep 1995 03:12:46 GMT References: <1995Sep18.080446.4005@cam.ac.uk> <1995Sep18.224246.5716@pipeline.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep18.224246.5716@pipeline.com>, hsmirnov@pipeline.com (Hana Smirnov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Mathieu Nakamura Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From lito@uni-hamburg.de Wed Sep 20 00:42:46 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!lito From: lito@uni-hamburg.de (Liam Ito) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep20.004246.5909@uni-hamburg.de> Date: Wed, 20 Sep 1995 00:42:46 GMT References: <1995Sep18.080446.4005@cam.ac.uk> <1995Sep18.224246.5716@pipeline.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Sep18.224246.5716@pipeline.com>, hsmirnov@pipeline.com (Hana Smirnov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Liam Ito Tape trading list upon request. SASE required for international mail. From tkang@rwth-aachen.de Wed Sep 20 17:14:46 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!tkang From: tkang@rwth-aachen.de (Takeshi Kang) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep20.171446.3688@rwth-aachen.de> Date: Wed, 20 Sep 1995 17:14:46 GMT References: <1995Sep18.080446.4005@cam.ac.uk> <1995Sep18.224246.5716@pipeline.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Sep18.224246.5716@pipeline.com>, hsmirnov@pipeline.com (Hana Smirnov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Takeshi Kang === Dept of Electrical Engineering, RWTH Aachen Informatik "There are 14 nodes and only 10 countries. Count again."