From tnovak@mit.edu Mon Oct 07 18:54:25 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!tnovak From: tnovak@mit.edu (Tyler Novak) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct07.185425.3109@mit.edu> Date: Mon, 07 Oct 1996 18:54:25 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] 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? -- Tyler Novak Tape trading list upon request. SASE required for international mail. From jtanaka@pipeline.com Tue Oct 08 06:39:25 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!jtanaka From: jtanaka@pipeline.com (Jens Tanaka) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct08.063925.3143@pipeline.com> Date: Tue, 08 Oct 1996 06:39:25 GMT References: <1996Oct07.185425.3109@mit.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Oct07.185425.3109@mit.edu>, tnovak@mit.edu (Tyler Novak) 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. PGP Public key available via finger or upon request. -- Jens Tanaka "The carrier frequency does not drift by accident." Commodore Amiga 500 (1MB OCS) / NEXTSTEP 3.3 From bivanov@utexas.edu Wed Oct 09 19:27:25 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!bivanov From: bivanov@utexas.edu (Brian Ivanov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct09.192725.5248@utexas.edu> Date: Wed, 09 Oct 1996 19:27:25 GMT References: <1996Oct07.185425.3109@mit.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Oct07.185425.3109@mit.edu>, tnovak@mit.edu (Tyler Novak) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Brian Ivanov "Hold for relay." PC-9821Ap2 (NEC) / AmigaOS 3.1 From dpopov@uni-hamburg.de Thu Oct 10 20:41:25 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!dpopov From: dpopov@uni-hamburg.de (Dong-hyun Popov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct10.204125.3798@uni-hamburg.de> Date: Thu, 10 Oct 1996 20:41:25 GMT References: <1996Oct07.185425.3109@mit.edu> <1996Oct08.063925.3143@pipeline.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Oct08.063925.3143@pipeline.com>, jtanaka@pipeline.com (Jens Tanaka) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > PGP Public key available via finger or upon request. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Dong-hyun Popov -- Universität Hamburg Fachbereich Informatik "Extraordinary claims require extraordinary spectra." From hrobertson@kth.se Sat Oct 12 19:07:25 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!hrobertson From: hrobertson@kth.se (Heather Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct12.190725.7313@kth.se> Date: Sat, 12 Oct 1996 19:07:25 GMT References: <1996Oct07.185425.3109@mit.edu> <1996Oct08.063925.3143@pipeline.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Oct08.063925.3143@pipeline.com>, jtanaka@pipeline.com (Jens Tanaka) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Heather Robertson "Marcus is not one man." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4