From kduarte@stanford.edu Sun Nov 10 08:37:38 1996 Path: ashpoly!cascade!brgate!saturno!stanford!kduarte From: kduarte@stanford.edu (Katrin Duarte) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov10.083738.5110@stanford.edu> Date: Sun, 10 Nov 1996 08:37:38 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.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? -- Katrin Duarte "They will send a copy in my place." Pentium 90 (OS/2 Warp) / SunOS 4.1.4 From ltakahashi@cern.ch Tue Nov 12 11:19:38 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!ltakahashi From: ltakahashi@cern.ch (Lucia Takahashi) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov12.111938.2061@cern.ch> Date: Tue, 12 Nov 1996 11:19:38 GMT References: <1996Nov10.083738.5110@stanford.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Nov10.083738.5110@stanford.edu>, kduarte@stanford.edu (Katrin Duarte) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Lucia Takahashi Tape trading list upon request. SASE required for international mail. From atakahashi@pacbell.net Wed Nov 13 11:09:38 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!atakahashi From: atakahashi@pacbell.net (Amy Takahashi) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov13.110938.3338@pacbell.net> Date: Wed, 13 Nov 1996 11:09:38 GMT References: <1996Nov10.083738.5110@stanford.edu> <1996Nov12.111938.2061@cern.ch> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Nov12.111938.2061@cern.ch>, ltakahashi@cern.ch (Lucia Takahashi) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Amy Takahashi *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0