From mokonkwo@purdue.edu Fri Jan 28 02:33:35 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!mokonkwo From: mokonkwo@purdue.edu (Marisol Okonkwo) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jan28.023335.5629@purdue.edu> Date: Fri, 28 Jan 1994 02:33:35 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Marisol Okonkwo "A soul is not exclusive to biology." Acorn RiscPC 600 / TOS 4.04 From fwatanabe@rwth-aachen.de Fri Jan 28 22:38:35 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!fwatanabe From: fwatanabe@rwth-aachen.de (Fiona Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jan28.223835.6492@rwth-aachen.de> Date: Fri, 28 Jan 1994 22:38:35 GMT References: <1994Jan28.023335.5629@purdue.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Jan28.023335.5629@purdue.edu>, mokonkwo@purdue.edu (Marisol Okonkwo) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Fiona Watanabe Practical Peripherals 14.4 @ 33,600 bps "Hardware is temporary. The signal survives." From plarsson@cern.ch Sun Jan 30 16:17:35 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!plarsson From: plarsson@cern.ch (Pavel Larsson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jan30.161735.8707@cern.ch> Date: Sun, 30 Jan 1994 16:17:35 GMT References: <1994Jan28.023335.5629@purdue.edu> <1994Jan28.223835.6492@rwth-aachen.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jan28.223835.6492@rwth-aachen.de>, fwatanabe@rwth-aachen.de (Fiona Watanabe) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Pavel Larsson Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------ From llee@inria.fr Tue Feb 01 09:57:35 1994 Path: ashpoly!cascade!bigsur!inria!llee From: llee@inria.fr (Liam Lee) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb01.095735.9381@inria.fr> Date: Tue, 01 Feb 1994 09:57:35 GMT References: <1994Jan28.023335.5629@purdue.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan28.023335.5629@purdue.edu>, mokonkwo@purdue.edu (Marisol Okonkwo) 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. -- Liam Lee Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------