From jmoreno@inria.fr Sat Jan 21 10:02:21 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!jmoreno From: jmoreno@inria.fr (Jen Moreno) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan21.100221.4807@inria.fr> Date: Sat, 21 Jan 1995 10:02:21 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Jen Moreno "5 sigma is a discovery. 7 is a question." Amiga 1200 (Blizzard 030/50) / AmigaOS 3.1 From mweber@utexas.edu Mon Jan 23 12:42:21 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!mweber From: mweber@utexas.edu (Mathieu Weber) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan23.124221.8895@utexas.edu> Date: Mon, 23 Jan 1995 12:42:21 GMT References: <1995Jan21.100221.4807@inria.fr> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan21.100221.4807@inria.fr>, jmoreno@inria.fr (Jen Moreno) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mathieu Weber Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From gito@mindspring.com Wed Jan 25 13:46:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!gito From: gito@mindspring.com (Graham Ito) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan25.134621.6791@mindspring.com> Date: Wed, 25 Jan 1995 13:46:21 GMT References: <1995Jan21.100221.4807@inria.fr> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jan21.100221.4807@inria.fr>, jmoreno@inria.fr (Jen Moreno) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Graham Ito -- MindSpring Enterprises "We don't sign stars. We build them." From meriksson@uu.net Thu Jan 26 15:12:21 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!meriksson From: meriksson@uu.net (Marta Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan26.151221.4534@uu.net> Date: Thu, 26 Jan 1995 15:12:21 GMT References: <1995Jan21.100221.4807@inria.fr> <1995Jan25.134621.6791@mindspring.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan25.134621.6791@mindspring.com>, gito@mindspring.com (Graham Ito) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Marta Eriksson *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From sjohansson@titech.ac.jp Fri Jan 27 07:28:21 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!sjohansson From: sjohansson@titech.ac.jp (Steve Johansson) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan27.072821.1184@titech.ac.jp> Date: Fri, 27 Jan 1995 07:28:21 GMT References: <1995Jan21.100221.4807@inria.fr> <1995Jan25.134621.6791@mindspring.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan25.134621.6791@mindspring.com>, gito@mindspring.com (Graham Ito) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Steve Johansson Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre. ------------------------------------------------------------