From shughes@kth.se Tue Feb 28 11:07:33 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!shughes From: shughes@kth.se (Seo-yeon Hughes) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb28.110733.1836@kth.se> Date: Tue, 28 Feb 1995 11:07:33 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Seo-yeon Hughes === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "There are 14 nodes and only 10 countries. Count again." From dchoi@berkeley.edu Thu Mar 02 00:44:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!dchoi From: dchoi@berkeley.edu (Dong-hyun Choi) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar02.004433.8697@berkeley.edu> Date: Thu, 02 Mar 1995 00:44:33 GMT References: <1995Feb28.110733.1836@kth.se> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb28.110733.1836@kth.se>, shughes@kth.se (Seo-yeon Hughes) 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. -- Dong-hyun Choi US Robotics Courier V.34 @ 33,600 bps "5 sigma is a discovery. 7 is a question." From fgonzalez@delphi.com Fri Mar 03 15:02:33 1995 Path: ashpoly!cascade!bigsur!delphi!fgonzalez From: fgonzalez@delphi.com (Freya González) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar03.150233.7560@delphi.com> Date: Fri, 03 Mar 1995 15:02:33 GMT References: <1995Feb28.110733.1836@kth.se> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb28.110733.1836@kth.se>, shughes@kth.se (Seo-yeon Hughes) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Freya González "Hardware is temporary. The signal survives." Mac IIci / 68882 FPU / SunOS 4.1.4 From nkang@kth.se Sun Mar 05 07:09:33 1995 Path: ashpoly!cascade!mxgate!coyoacan!kth!nkang From: nkang@kth.se (Nadia Kang) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar05.070933.9645@kth.se> Date: Sun, 05 Mar 1995 07:09:33 GMT References: <1995Feb28.110733.1836@kth.se> <1995Mar03.150233.7560@delphi.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar03.150233.7560@delphi.com>, fgonzalez@delphi.com (Freya González) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Nadia Kang Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------