From tlindqvist@demon.co.uk Mon Sep 26 05:16:26 1994 Path: ashpoly!cascade!bigsur!demon!tlindqvist From: tlindqvist@demon.co.uk (Tomas Lindqvist) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep26.051626.3854@demon.co.uk> Date: Mon, 26 Sep 1994 05:16:26 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] 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'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Tomas Lindqvist | tlindqvist@demon.co.uk PGP Key fingerprint: 3BC3 3BE1 820E F852 "Keep the channels open." From sperez@cmu.edu Mon Sep 26 17:44:26 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!sperez From: sperez@cmu.edu (Sun-mi Pérez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep26.174426.7291@cmu.edu> Date: Mon, 26 Sep 1994 17:44:26 GMT References: <1994Sep26.051626.3854@demon.co.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Sep26.051626.3854@demon.co.uk>, tlindqvist@demon.co.uk (Tomas Lindqvist) 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. -- Sun-mi Pérez "The carrier frequency does not drift by accident." Amiga 1200 (Blizzard 030/50) / FreeBSD 2.1 From skim@hanse.de Mon Sep 26 22:27:26 1994 Path: ashpoly!cascade!brgate!saturno!hanse!skim From: skim@hanse.de (Sven Kim) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep26.222726.3934@hanse.de> Date: Mon, 26 Sep 1994 22:27:26 GMT References: <1994Sep26.051626.3854@demon.co.uk> <1994Sep26.174426.7291@cmu.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Sep26.174426.7291@cmu.edu>, sperez@cmu.edu (Sun-mi Pérez) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Sven Kim *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From vtakahashi@uu.net Thu Sep 29 02:12:26 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!vtakahashi From: vtakahashi@uu.net (Valeria Takahashi) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep29.021226.1525@uu.net> Date: Thu, 29 Sep 1994 02:12:26 GMT References: <1994Sep26.051626.3854@demon.co.uk> <1994Sep26.174426.7291@cmu.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Sep26.174426.7291@cmu.edu>, sperez@cmu.edu (Sun-mi Pérez) 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. -- Valeria Takahashi Tape trading list upon request. SASE required for international mail.