From ahughes@titech.ac.jp Fri Dec 06 06:49:02 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!ahughes From: ahughes@titech.ac.jp (Andrei Hughes) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec06.064902.5004@titech.ac.jp> Date: Fri, 06 Dec 1996 06:49:02 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Andrei Hughes | ahughes@titech.ac.jp PGP Key fingerprint: B99B D824 F0DE E778 "Keep the channels open." From jgarcia@clari.net Sat Dec 07 13:07:02 1996 Path: ashpoly!cascade!bigsur!clari!jgarcia From: jgarcia@clari.net (Jens García) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec07.130702.3134@clari.net> Date: Sat, 07 Dec 1996 13:07:02 GMT References: <1996Dec06.064902.5004@titech.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec06.064902.5004@titech.ac.jp>, ahughes@titech.ac.jp (Andrei Hughes) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Jens García "There are 14 nodes and only 10 countries. Count again." Decstation 5000/200 / AmigaOS 3.1 From tkowalski@mit.edu Mon Dec 09 08:52:02 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!tkowalski From: tkowalski@mit.edu (Tobias Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec09.085202.6107@mit.edu> Date: Mon, 09 Dec 1996 08:52:02 GMT References: <1996Dec06.064902.5004@titech.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Dec06.064902.5004@titech.ac.jp>, ahughes@titech.ac.jp (Andrei Hughes) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- === Tobias Kowalski === Dept of Electrical Engineering, Massachusetts Institute of Technology "When every node is whole, the channel opens." From pfournier@purdue.edu Tue Dec 10 08:56:02 1996 Path: ashpoly!cascade!mxgate!coyoacan!purdue!pfournier From: pfournier@purdue.edu (Pavel Fournier) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec10.085602.2960@purdue.edu> Date: Tue, 10 Dec 1996 08:56:02 GMT References: <1996Dec06.064902.5004@titech.ac.jp> <1996Dec09.085202.6107@mit.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Dec09.085202.6107@mit.edu>, tkowalski@mit.edu (Tobias Kowalski) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Pavel Fournier === Dept of Electrical Engineering, Purdue University Engineering Computer Network "There are 14 nodes and only 10 countries. Count again." From jsmirnov@hanse.de Wed Dec 11 05:45:02 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!jsmirnov From: jsmirnov@hanse.de (Joachim Smirnov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec11.054502.2477@hanse.de> Date: Wed, 11 Dec 1996 05:45:02 GMT References: <1996Dec06.064902.5004@titech.ac.jp> <1996Dec09.085202.6107@mit.edu> <1996Dec10.085602.2960@purdue.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Dec10.085602.2960@purdue.edu>, pfournier@purdue.edu (Pavel Fournier) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Looks like a prototype telecommunications board for military secure voice, not an audio music product. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Joachim Smirnov "The carrier frequency does not drift by accident." Sun SparcStation 20 / TOS 4.04