From meriksson@delphi.com Sun Sep 10 00:34:01 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!meriksson From: meriksson@delphi.com (Min-jun Eriksson) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep10.003401.3041@delphi.com> Date: Sun, 10 Sep 1995 00:34:01 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Min-jun Eriksson *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From meriksson@ox.ac.uk Mon Sep 11 16:27:01 1995 Path: ashpoly!cascade!bigsur!ox!meriksson From: meriksson@ox.ac.uk (Min-jun Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep11.162701.9153@ox.ac.uk> Date: Mon, 11 Sep 1995 16:27:01 GMT References: <1995Sep10.003401.3041@delphi.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep10.003401.3041@delphi.com>, meriksson@delphi.com (Min-jun Eriksson) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Min-jun Eriksson Tape trading list upon request. SASE required for international mail. From lkuznetsov@netcom.com Mon Sep 11 21:21:01 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!lkuznetsov From: lkuznetsov@netcom.com (Lars Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep11.212101.2012@netcom.com> Date: Mon, 11 Sep 1995 21:21:01 GMT References: <1995Sep10.003401.3041@delphi.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep10.003401.3041@delphi.com>, meriksson@delphi.com (Min-jun Eriksson) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Lars Kuznetsov Tape trading list upon request. SASE required for international mail.