From gmacdonald@clari.net Fri Dec 13 12:30:17 1996 Path: ashpoly!cascade!brgate!saturno!clari!gmacdonald From: gmacdonald@clari.net (Graham MacDonald) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec13.123017.4146@clari.net> Date: Fri, 13 Dec 1996 12:30:17 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 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. -- Graham MacDonald Hayes Optima 288 @ 14,400 bps "They will send a copy in my place." From eweber@delphi.com Fri Dec 13 20:21:17 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!eweber From: eweber@delphi.com (Elaine Weber) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec13.202117.9198@delphi.com> Date: Fri, 13 Dec 1996 20:21:17 GMT References: <1996Dec13.123017.4146@clari.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Dec13.123017.4146@clari.net>, gmacdonald@clari.net (Graham MacDonald) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Elaine Weber "The hatch is open. Is anyone listening?" Mac IIci / 68882 FPU / AmigaOS 3.1 From rmuller@u-tokyo.ac.jp Sun Dec 15 02:12:17 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!rmuller From: rmuller@u-tokyo.ac.jp (Rodrigo Müller) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec15.021217.8760@u-tokyo.ac.jp> Date: Sun, 15 Dec 1996 02:12:17 GMT References: <1996Dec13.123017.4146@clari.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Dec13.123017.4146@clari.net>, gmacdonald@clari.net (Graham MacDonald) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Rodrigo Müller "There are 14 nodes and only 10 countries. Count again." 486DX2/66 (Linux 1.2.13) / Linux 1.2.13 From tmoreno@berkeley.edu Sun Dec 15 10:14:17 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!tmoreno From: tmoreno@berkeley.edu (Tobias Moreno) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec15.101417.3722@berkeley.edu> Date: Sun, 15 Dec 1996 10:14:17 GMT References: <1996Dec13.123017.4146@clari.net> <1996Dec15.021217.8760@u-tokyo.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Dec15.021217.8760@u-tokyo.ac.jp>, rmuller@u-tokyo.ac.jp (Rodrigo Müller) 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. -- Tobias Moreno | tmoreno@berkeley.edu PGP Key fingerprint: 6F60 B75F 9A3F BBDD "Keep the channels open." From nstewart@pacbell.net Sun Dec 15 19:36:17 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!nstewart From: nstewart@pacbell.net (Nadine Stewart) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec15.193617.3324@pacbell.net> Date: Sun, 15 Dec 1996 19:36:17 GMT References: <1996Dec13.123017.4146@clari.net> <1996Dec15.021217.8760@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec15.021217.8760@u-tokyo.ac.jp>, rmuller@u-tokyo.ac.jp (Rodrigo Müller) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- === Nadine Stewart === Dept of Electrical Engineering, Pacific Bell Internet Services "Extraordinary claims require extraordinary spectra."