From bhernandez@stanford.edu Mon Dec 04 00:02:20 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!bhernandez From: bhernandez@stanford.edu (Bill Hernández) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec04.000220.7910@stanford.edu> Date: Mon, 04 Dec 1995 00:02:20 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 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. 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. -- === Bill Hernández === Dept of Electrical Engineering, Stanford University Computer Systems Lab "The carrier frequency does not drift by accident." From epark@panix.com Mon Dec 04 23:19:20 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!epark From: epark@panix.com (Emi Park) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec04.231920.5650@panix.com> Date: Mon, 04 Dec 1995 23:19:20 GMT References: <1995Dec04.000220.7910@stanford.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec04.000220.7910@stanford.edu>, bhernandez@stanford.edu (Bill Hernández) writes: > 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. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Emi Park "Extraordinary claims require extraordinary spectra." PC-9821Ap2 (NEC) / SunOS 4.1.4 From bokonkwo@u-tokyo.ac.jp Tue Dec 05 06:09:20 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!bokonkwo From: bokonkwo@u-tokyo.ac.jp (Bastien Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec05.060920.2177@u-tokyo.ac.jp> Date: Tue, 05 Dec 1995 06:09:20 GMT References: <1995Dec04.000220.7910@stanford.edu> <1995Dec04.231920.5650@panix.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Dec04.231920.5650@panix.com>, epark@panix.com (Emi Park) writes: > Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Bastien Okonkwo Tape trading list upon request. SASE required for international mail. From mreyes@titech.ac.jp Wed Dec 06 19:15:20 1995 Path: ashpoly!cascade!brgate!saturno!titech!mreyes From: mreyes@titech.ac.jp (Matthias Reyes) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec06.191520.7329@titech.ac.jp> Date: Wed, 06 Dec 1995 19:15:20 GMT References: <1995Dec04.000220.7910@stanford.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec04.000220.7910@stanford.edu>, bhernandez@stanford.edu (Bill Hernández) 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. -- Matthias Reyes US Robotics Courier V.34 @ 9600 Telebit bps "Row 14. No joke." From dgarcia@cmu.edu Thu Dec 07 10:29:20 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!dgarcia From: dgarcia@cmu.edu (Dmitri García) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec07.102920.4257@cmu.edu> Date: Thu, 07 Dec 1995 10:29:20 GMT References: <1995Dec04.000220.7910@stanford.edu> <1995Dec04.231920.5650@panix.com> <1995Dec05.060920.2177@u-tokyo.ac.jp> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec05.060920.2177@u-tokyo.ac.jp>, bokonkwo@u-tokyo.ac.jp (Bastien Okonkwo) 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. -- Dmitri García "There are 14 nodes and only 10 countries. Count again." NeXTstation Turbo Color / NEXTSTEP 3.3