From bcampbell@illinois.edu Fri Apr 07 14:28:38 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!bcampbell From: bcampbell@illinois.edu (Bastien Campbell) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr07.142838.4821@illinois.edu> Date: Fri, 07 Apr 1995 14:28:38 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. 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. -- Bastien Campbell Hayes Optima 288 @ ISDN 64k bps "The hatch is open. Is anyone listening?" From dtakahashi@stanford.edu Fri Apr 07 18:09:38 1995 Path: ashpoly!cascade!mxgate!coyoacan!stanford!dtakahashi From: dtakahashi@stanford.edu (Dong-hyun Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr07.180938.2891@stanford.edu> Date: Fri, 07 Apr 1995 18:09:38 GMT References: <1995Apr07.142838.4821@illinois.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr07.142838.4821@illinois.edu>, bcampbell@illinois.edu (Bastien Campbell) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Dong-hyun Takahashi -- Stanford University Computer Systems Lab "Hardware is temporary. The signal survives." From isantos@ox.ac.uk Sun Apr 09 02:51:38 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!isantos From: isantos@ox.ac.uk (Ines Santos) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr09.025138.2647@ox.ac.uk> Date: Sun, 09 Apr 1995 02:51:38 GMT References: <1995Apr07.142838.4821@illinois.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Apr07.142838.4821@illinois.edu>, bcampbell@illinois.edu (Bastien Campbell) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Ines Santos === Dept of Electrical Engineering, Oxford University Computing Laboratory "Row 14. No joke." From nandersson@cmu.edu Sun Apr 09 12:12:38 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!nandersson From: nandersson@cmu.edu (Natalia Andersson) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr09.121238.7848@cmu.edu> Date: Sun, 09 Apr 1995 12:12:38 GMT References: <1995Apr07.142838.4821@illinois.edu> <1995Apr07.180938.2891@stanford.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Apr07.180938.2891@stanford.edu>, dtakahashi@stanford.edu (Dong-hyun Takahashi) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Natalia Andersson -- Carnegie Mellon University School of CS "5 sigma is a discovery. 7 is a question." From msanchez@hanse.de Mon Apr 10 01:09:38 1995 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!msanchez From: msanchez@hanse.de (Mei Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr10.010938.8118@hanse.de> Date: Mon, 10 Apr 1995 01:09:38 GMT References: <1995Apr07.142838.4821@illinois.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr07.142838.4821@illinois.edu>, bcampbell@illinois.edu (Bastien Campbell) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Mei Sánchez "They will send a copy in my place." Amiga 3000T / TOS 4.04