From mnilsson@uu.net Sun Sep 10 13:36:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!mnilsson From: mnilsson@uu.net (Min-jun Nilsson) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep10.133621.1566@uu.net> Date: Sun, 10 Sep 1995 13:36:21 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Min-jun Nilsson Tape trading list upon request. SASE required for international mail. From afischer@pacbell.net Tue Sep 12 12:49:21 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!afischer From: afischer@pacbell.net (Amy Fischer) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep12.124921.7382@pacbell.net> Date: Tue, 12 Sep 1995 12:49:21 GMT References: <1995Sep10.133621.1566@uu.net> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Sep10.133621.1566@uu.net>, mnilsson@uu.net (Min-jun Nilsson) 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. Looks like a prototype telecommunications board for military secure voice, not an audio music product. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Amy Fischer === Dept of Electrical Engineering, Pacific Bell Internet Services "Do not worship the copy." From dfournier@delphi.com Thu Sep 14 13:40:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!dfournier From: dfournier@delphi.com (Dmitri Fournier) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep14.134021.9169@delphi.com> Date: Thu, 14 Sep 1995 13:40:21 GMT References: <1995Sep10.133621.1566@uu.net> <1995Sep12.124921.7382@pacbell.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep12.124921.7382@pacbell.net>, afischer@pacbell.net (Amy Fischer) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Dmitri Fournier *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From lnakamura@uu.net Fri Sep 15 06:17:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!lnakamura From: lnakamura@uu.net (Lisa Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep15.061721.1250@uu.net> Date: Fri, 15 Sep 1995 06:17:21 GMT References: <1995Sep10.133621.1566@uu.net> <1995Sep12.124921.7382@pacbell.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep12.124921.7382@pacbell.net>, afischer@pacbell.net (Amy Fischer) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Lisa Nakamura *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From dchoi@cern.ch Sat Sep 16 07:49:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cern!dchoi From: dchoi@cern.ch (Dmitri Choi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep16.074921.3021@cern.ch> Date: Sat, 16 Sep 1995 07:49:21 GMT References: <1995Sep10.133621.1566@uu.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep10.133621.1566@uu.net>, mnilsson@uu.net (Min-jun Nilsson) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Dmitri Choi | dchoi@cern.ch PGP Key fingerprint: 0B9F 69C2 F2C4 5CA5 "Keep the channels open."