From alee@hanse.de Sat Oct 22 08:05:21 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!alee From: alee@hanse.de (Aiko Lee) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct22.080521.8407@hanse.de> Date: Sat, 22 Oct 1994 08:05:21 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de 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'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Aiko Lee *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From egonzalez@cmu.edu Mon Oct 24 01:50:21 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!egonzalez From: egonzalez@cmu.edu (Élodie González) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct24.015021.4776@cmu.edu> Date: Mon, 24 Oct 1994 01:50:21 GMT References: <1994Oct22.080521.8407@hanse.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Oct22.080521.8407@hanse.de>, alee@hanse.de (Aiko Lee) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Élodie González "The hatch is open. Is anyone listening?" 486DX2/66 (Linux 1.2.13) / FreeBSD 2.1 From jgonzalez@kiae.su Tue Oct 25 19:26:21 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!jgonzalez From: jgonzalez@kiae.su (Julien González) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct25.192621.4878@kiae.su> Date: Tue, 25 Oct 1994 19:26:21 GMT References: <1994Oct22.080521.8407@hanse.de> <1994Oct24.015021.4776@cmu.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Oct24.015021.4776@cmu.edu>, egonzalez@cmu.edu (Élodie González) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Julien González Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From vmartinez@rwth-aachen.de Thu Oct 27 22:20:21 1994 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!vmartinez From: vmartinez@rwth-aachen.de (Valeria Martínez) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct27.222021.5780@rwth-aachen.de> Date: Thu, 27 Oct 1994 22:20:21 GMT References: <1994Oct22.080521.8407@hanse.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Oct22.080521.8407@hanse.de>, alee@hanse.de (Aiko Lee) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- === Valeria Martínez === Dept of Electrical Engineering, RWTH Aachen Informatik "When every node is whole, the channel opens." From kmacdonald@stanford.edu Fri Oct 28 11:16:21 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!kmacdonald From: kmacdonald@stanford.edu (Kenji MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct28.111621.6963@stanford.edu> Date: Fri, 28 Oct 1994 11:16:21 GMT References: <1994Oct22.080521.8407@hanse.de> <1994Oct24.015021.4776@cmu.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Oct24.015021.4776@cmu.edu>, egonzalez@cmu.edu (Élodie González) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Kenji MacDonald | kmacdonald@stanford.edu PGP Key fingerprint: 9FDD 8E40 0FB0 6E4F "Keep the channels open."