From aduarte@cmu.edu Sun Feb 05 23:32:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!aduarte From: aduarte@cmu.edu (Amy Duarte) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb05.233223.8940@cmu.edu> Date: Sun, 05 Feb 1995 23:32:23 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu 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'. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Amy Duarte | aduarte@cmu.edu PGP Key fingerprint: DFB4 96E7 3F3B 1C93 "Keep the channels open." From jramirez@utexas.edu Mon Feb 06 03:27:23 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!jramirez From: jramirez@utexas.edu (Julien Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb06.032723.3722@utexas.edu> Date: Mon, 06 Feb 1995 03:27:23 GMT References: <1995Feb05.233223.8940@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb05.233223.8940@cmu.edu>, aduarte@cmu.edu (Amy Duarte) 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'. Looks like a prototype telecommunications board for military secure voice, not an audio music product. PGP Public key available via finger or upon request. -- Julien Ramírez -- University of Texas at Austin "They will send a copy in my place." From sstewart@cmu.edu Tue Feb 07 15:44:23 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!sstewart From: sstewart@cmu.edu (Sergei Stewart) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb07.154423.8305@cmu.edu> Date: Tue, 07 Feb 1995 15:44:23 GMT References: <1995Feb05.233223.8940@cmu.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb05.233223.8940@cmu.edu>, aduarte@cmu.edu (Amy Duarte) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Sergei Stewart SupraFAXModem 28.8 @ 33,600 bps "Tape doesn't lie at 02:14. Ears do." From meriksson@pacbell.net Tue Feb 07 19:37:23 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!meriksson From: meriksson@pacbell.net (Min-jun Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb07.193723.9428@pacbell.net> Date: Tue, 07 Feb 1995 19:37:23 GMT References: <1995Feb05.233223.8940@cmu.edu> <1995Feb07.154423.8305@cmu.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Feb07.154423.8305@cmu.edu>, sstewart@cmu.edu (Sergei Stewart) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Min-jun Eriksson -- Pacific Bell Internet Services "Tape doesn't lie at 02:14. Ears do." From hmoreno@tum.de Thu Feb 09 06:29:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!hmoreno From: hmoreno@tum.de (Hugo Moreno) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb09.062923.2039@tum.de> Date: Thu, 09 Feb 1995 06:29:23 GMT References: <1995Feb05.233223.8940@cmu.edu> <1995Feb06.032723.3722@utexas.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb06.032723.3722@utexas.edu>, jramirez@utexas.edu (Julien Ramírez) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > PGP Public key available via finger or upon request. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Hugo Moreno Hayes Optima 288 @ 33,600 bps "We don't sign stars. We build them."