From elindqvist@kth.se Sat Sep 16 21:44:16 1995 Path: ashpoly!cascade!transat!ukc!fennimore!kth!elindqvist From: elindqvist@kth.se (Elaine Lindqvist) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep16.214416.2364@kth.se> Date: Sat, 16 Sep 1995 21:44:16 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Elaine Lindqvist *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From msilva@u-tokyo.ac.jp Sun Sep 17 11:05:16 1995 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!msilva From: msilva@u-tokyo.ac.jp (Matthias Silva) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep17.110516.6026@u-tokyo.ac.jp> Date: Sun, 17 Sep 1995 11:05:16 GMT References: <1995Sep16.214416.2364@kth.se> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep16.214416.2364@kth.se>, elindqvist@kth.se (Elaine Lindqvist) 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. -- Matthias Silva *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From acampbell@mit.edu Sun Sep 17 22:29:16 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!acampbell From: acampbell@mit.edu (Andrei Campbell) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep17.222916.8654@mit.edu> Date: Sun, 17 Sep 1995 22:29:16 GMT References: <1995Sep16.214416.2364@kth.se> <1995Sep17.110516.6026@u-tokyo.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep17.110516.6026@u-tokyo.ac.jp>, msilva@u-tokyo.ac.jp (Matthias Silva) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Andrei Campbell "We don't sign stars. We build them." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4 From gsouza@pacbell.net Tue Sep 19 17:22:16 1995 Path: ashpoly!cascade!bigsur!pacbell!gsouza From: gsouza@pacbell.net (Graham Souza) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep19.172216.5494@pacbell.net> Date: Tue, 19 Sep 1995 17:22:16 GMT References: <1995Sep16.214416.2364@kth.se> <1995Sep17.110516.6026@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Sep17.110516.6026@u-tokyo.ac.jp>, msilva@u-tokyo.ac.jp (Matthias Silva) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- === Graham Souza === Dept of Electrical Engineering, Pacific Bell Internet Services "We don't sign stars. We build them."