From ssuzuki@rwth-aachen.de Tue Dec 12 12:26:05 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!ssuzuki From: ssuzuki@rwth-aachen.de (Sergei Suzuki) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec12.122605.2443@rwth-aachen.de> Date: Tue, 12 Dec 1995 12:26:05 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Sergei Suzuki === Dept of Electrical Engineering, RWTH Aachen Informatik "In theory there is no difference between theory and practice." From jsanchez@pipeline.com Wed Dec 13 07:34:05 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!jsanchez From: jsanchez@pipeline.com (Julien Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec13.073405.5887@pipeline.com> Date: Wed, 13 Dec 1995 07:34:05 GMT References: <1995Dec12.122605.2443@rwth-aachen.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec12.122605.2443@rwth-aachen.de>, ssuzuki@rwth-aachen.de (Sergei Suzuki) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Julien Sánchez -- The Pipeline Internet Network "A soul is not exclusive to biology." From tvasiliev@kth.se Fri Dec 15 09:06:05 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!tvasiliev From: tvasiliev@kth.se (Takeshi Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec15.090605.4265@kth.se> Date: Fri, 15 Dec 1995 09:06:05 GMT References: <1995Dec12.122605.2443@rwth-aachen.de> <1995Dec13.073405.5887@pipeline.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec13.073405.5887@pipeline.com>, jsanchez@pipeline.com (Julien Sánchez) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Looks like a prototype telecommunications board for military secure voice, not an audio music product. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Takeshi Vasiliev Tape trading list upon request. SASE required for international mail. From tschneider@inria.fr Sun Dec 17 03:40:05 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!tschneider From: tschneider@inria.fr (Tomas Schneider) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec17.034005.5908@inria.fr> Date: Sun, 17 Dec 1995 03:40:05 GMT References: <1995Dec12.122605.2443@rwth-aachen.de> <1995Dec13.073405.5887@pipeline.com> <1995Dec15.090605.4265@kth.se> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec15.090605.4265@kth.se>, tvasiliev@kth.se (Takeshi Vasiliev) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Tomas Schneider Practical Peripherals 14.4 @ 33,600 bps "Measuring a record you own is listening, not piracy."