From spark@hanse.de Tue Nov 26 15:47:55 1996 Path: ashpoly!cascade!mxgate!coyoacan!hanse!spark From: spark@hanse.de (Sun-mi Park) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov26.154755.7933@hanse.de> Date: Tue, 26 Nov 1996 15:47:55 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Sun-mi Park === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "Tape doesn't lie at 02:14. Ears do." From tsokolov@delphi.com Wed Nov 27 00:58:55 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!tsokolov From: tsokolov@delphi.com (Tobias Sokolov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov27.005855.2707@delphi.com> Date: Wed, 27 Nov 1996 00:58:55 GMT References: <1996Nov26.154755.7933@hanse.de> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Nov26.154755.7933@hanse.de>, spark@hanse.de (Sun-mi Park) 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 MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Tobias Sokolov Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From mpopov@pipeline.com Wed Nov 27 18:27:55 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!mpopov From: mpopov@pipeline.com (Morag Popov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov27.182755.9290@pipeline.com> Date: Wed, 27 Nov 1996 18:27:55 GMT References: <1996Nov26.154755.7933@hanse.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Nov26.154755.7933@hanse.de>, spark@hanse.de (Sun-mi Park) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Morag Popov US Robotics Courier V.34 @ 33,600 bps "The carrier frequency does not drift by accident." From jsokolov@cam.ac.uk Thu Nov 28 09:43:55 1996 Path: ashpoly!cascade!mxgate!coyoacan!cam!jsokolov From: jsokolov@cam.ac.uk (Jens Sokolov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov28.094355.3264@cam.ac.uk> Date: Thu, 28 Nov 1996 09:43:55 GMT References: <1996Nov26.154755.7933@hanse.de> <1996Nov27.182755.9290@pipeline.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Nov27.182755.9290@pipeline.com>, mpopov@pipeline.com (Morag Popov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Jens Sokolov | jsokolov@cam.ac.uk PGP Key fingerprint: 5DEA F942 CFE5 DADB "Keep the channels open."