From asouza@netcom.com Wed Nov 08 12:25:06 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!asouza From: asouza@netcom.com (Anton Souza) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov08.122506.1006@netcom.com> Date: Wed, 08 Nov 1995 12:25:06 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Anton Souza === Dept of Electrical Engineering, NETCOM On-Line Communication Services "We don't sign stars. We build them." From nsilva@uu.net Fri Nov 10 09:13:06 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!nsilva From: nsilva@uu.net (Natalia Silva) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov10.091306.9706@uu.net> Date: Fri, 10 Nov 1995 09:13:06 GMT References: <1995Nov08.122506.1006@netcom.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Nov08.122506.1006@netcom.com>, asouza@netcom.com (Anton Souza) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Natalia Silva "Marcus is not one man." Mac IIci / 68882 FPU / TOS 4.04 From kdubois@utexas.edu Sat Nov 11 11:00:06 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!kdubois From: kdubois@utexas.edu (Kirsty Dubois) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov11.110006.7769@utexas.edu> Date: Sat, 11 Nov 1995 11:00:06 GMT References: <1995Nov08.122506.1006@netcom.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Nov08.122506.1006@netcom.com>, asouza@netcom.com (Anton Souza) writes: > 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. If you are posting from AOL, please read RFC 1036 before posting again. -- Kirsty Dubois -- University of Texas at Austin "We don't sign stars. We build them." From mwatanabe@uni-hamburg.de Mon Nov 13 12:09:06 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!mwatanabe From: mwatanabe@uni-hamburg.de (Morag Watanabe) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov13.120906.9498@uni-hamburg.de> Date: Mon, 13 Nov 1995 12:09:06 GMT References: <1995Nov08.122506.1006@netcom.com> <1995Nov11.110006.7769@utexas.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov11.110006.7769@utexas.edu>, kdubois@utexas.edu (Kirsty Dubois) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Morag Watanabe *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0