From aduarte@cmu.edu Mon Jul 17 17:14:53 1995 Path: ashpoly!cascade!mxgate!coyoacan!cmu!aduarte From: aduarte@cmu.edu (Astrid Duarte) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul17.171453.7618@cmu.edu> Date: Mon, 17 Jul 1995 17:14:53 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Astrid Duarte | aduarte@cmu.edu PGP Key fingerprint: A54C 7AB6 9BB7 4B7F "Keep the channels open." From cschneider@purdue.edu Wed Jul 19 06:28:53 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!cschneider From: cschneider@purdue.edu (Camila Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul19.062853.5958@purdue.edu> Date: Wed, 19 Jul 1995 06:28:53 GMT References: <1995Jul17.171453.7618@cmu.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul17.171453.7618@cmu.edu>, aduarte@cmu.edu (Astrid Duarte) 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. -- Camila Schneider *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From kschneider@cmu.edu Thu Jul 20 23:18:53 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!kschneider From: kschneider@cmu.edu (Kirsty Schneider) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul20.231853.5089@cmu.edu> Date: Thu, 20 Jul 1995 23:18:53 GMT References: <1995Jul17.171453.7618@cmu.edu> <1995Jul19.062853.5958@purdue.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul19.062853.5958@purdue.edu>, cschneider@purdue.edu (Camila Schneider) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Kirsty Schneider "The hatch is open. Is anyone listening?" PC-9821Ap2 (NEC) / AmigaOS 3.1 From rsato@ox.ac.uk Sun Jul 23 02:00:53 1995 Path: ashpoly!cascade!bigsur!ox!rsato From: rsato@ox.ac.uk (Renata Sato) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul23.020053.2450@ox.ac.uk> Date: Sun, 23 Jul 1995 02:00:53 GMT References: <1995Jul17.171453.7618@cmu.edu> <1995Jul19.062853.5958@purdue.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul19.062853.5958@purdue.edu>, cschneider@purdue.edu (Camila Schneider) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Renata Sato | rsato@ox.ac.uk PGP Key fingerprint: 78FA F44B 8D7D EA13 "Keep the channels open." From drobertson@cern.ch Tue Jul 25 02:15:53 1995 Path: ashpoly!cascade!bigsur!cern!drobertson From: drobertson@cern.ch (Dong-hyun Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul25.021553.3283@cern.ch> Date: Tue, 25 Jul 1995 02:15:53 GMT References: <1995Jul17.171453.7618@cmu.edu> <1995Jul19.062853.5958@purdue.edu> <1995Jul23.020053.2450@ox.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul23.020053.2450@ox.ac.uk>, rsato@ox.ac.uk (Renata Sato) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Dong-hyun Robertson *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0