From srobertson@inria.fr Tue Aug 09 03:44:27 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!srobertson From: srobertson@inria.fr (Sergei Robertson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug09.034427.5857@inria.fr> Date: Tue, 09 Aug 1994 03:44:27 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Sergei Robertson Hayes Optima 288 @ 28,800 bps "They will send a copy in my place." From lcampbell@mindspring.com Thu Aug 11 01:35:27 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!lcampbell From: lcampbell@mindspring.com (Liam Campbell) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug11.013527.4160@mindspring.com> Date: Thu, 11 Aug 1994 01:35:27 GMT References: <1994Aug09.034427.5857@inria.fr> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Aug09.034427.5857@inria.fr>, srobertson@inria.fr (Sergei Robertson) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Liam Campbell -- MindSpring Enterprises "Measuring a record you own is listening, not piracy." From mlopez@netcom.com Fri Aug 12 14:15:27 1994 Path: ashpoly!cascade!brgate!saturno!netcom!mlopez From: mlopez@netcom.com (Marta López) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug12.141527.9591@netcom.com> Date: Fri, 12 Aug 1994 14:15:27 GMT References: <1994Aug09.034427.5857@inria.fr> <1994Aug11.013527.4160@mindspring.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Aug11.013527.4160@mindspring.com>, lcampbell@mindspring.com (Liam Campbell) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- === Marta López === Dept of Electrical Engineering, NETCOM On-Line Communication Services "When every node is whole, the channel opens." From ycampbell@berkeley.edu Sat Aug 13 19:36:27 1994 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!ycampbell From: ycampbell@berkeley.edu (Yuki Campbell) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug13.193627.4308@berkeley.edu> Date: Sat, 13 Aug 1994 19:36:27 GMT References: <1994Aug09.034427.5857@inria.fr> <1994Aug11.013527.4160@mindspring.com> <1994Aug12.141527.9591@netcom.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Aug12.141527.9591@netcom.com>, mlopez@netcom.com (Marta López) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. 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. -- Yuki Campbell -- UC Berkeley Department of EECS "There are 14 nodes and only 10 countries. Count again." From ldubois@hanse.de Sun Aug 14 05:34:27 1994 Path: ashpoly!cascade!brgate!saturno!hanse!ldubois From: ldubois@hanse.de (Liam Dubois) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug14.053427.6574@hanse.de> Date: Sun, 14 Aug 1994 05:34:27 GMT References: <1994Aug09.034427.5857@inria.fr> <1994Aug11.013527.4160@mindspring.com> <1994Aug12.141527.9591@netcom.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Aug12.141527.9591@netcom.com>, mlopez@netcom.com (Marta López) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- Liam Dubois Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------