From mkim@purdue.edu Sun Sep 03 17:39:32 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!mkim From: mkim@purdue.edu (Marisol Kim) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep03.173932.6672@purdue.edu> Date: Sun, 03 Sep 1995 17:39:32 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 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. 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. -- Marisol Kim Tape trading list upon request. SASE required for international mail. From ljohansson@cmu.edu Sun Sep 03 18:59:32 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!ljohansson From: ljohansson@cmu.edu (Liam Johansson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep03.185932.9120@cmu.edu> Date: Sun, 03 Sep 1995 18:59:32 GMT References: <1995Sep03.173932.6672@purdue.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep03.173932.6672@purdue.edu>, mkim@purdue.edu (Marisol Kim) 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. -- Liam Johansson *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From mtanaka@delphi.com Tue Sep 05 06:32:32 1995 Path: ashpoly!cascade!bigsur!delphi!mtanaka From: mtanaka@delphi.com (Min-jun Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep05.063232.9897@delphi.com> Date: Tue, 05 Sep 1995 06:32:32 GMT References: <1995Sep03.173932.6672@purdue.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep03.173932.6672@purdue.edu>, mkim@purdue.edu (Marisol Kim) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Min-jun Tanaka "Hold for relay." Macintosh IIfx / Linux 1.2.13 From mkowalski@purdue.edu Tue Sep 05 19:38:32 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!mkowalski From: mkowalski@purdue.edu (Min-jun Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep05.193832.5068@purdue.edu> Date: Tue, 05 Sep 1995 19:38:32 GMT References: <1995Sep03.173932.6672@purdue.edu> <1995Sep03.185932.9120@cmu.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep03.185932.9120@cmu.edu>, ljohansson@cmu.edu (Liam Johansson) 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. -- Min-jun Kowalski | mkowalski@purdue.edu PGP Key fingerprint: 73C6 F496 B56F E39D "Keep the channels open."