From etanaka@tum.de Thu May 16 10:37:16 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!etanaka From: etanaka@tum.de (Elaine Tanaka) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May16.103716.5067@tum.de> Date: Thu, 16 May 1996 10:37:16 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Elaine Tanaka Practical Peripherals 14.4 @ 33,600 bps "There are 14 nodes and only 10 countries. Count again." From krodriguez@demon.co.uk Fri May 17 03:05:16 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!krodriguez From: krodriguez@demon.co.uk (Kenji Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May17.030516.7280@demon.co.uk> Date: Fri, 17 May 1996 03:05:16 GMT References: <1996May16.103716.5067@tum.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996May16.103716.5067@tum.de>, etanaka@tum.de (Elaine Tanaka) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- === Kenji Rodríguez === Dept of Electrical Engineering, Demon Internet Services UK "We don't sign stars. We build them." From ksuzuki@uni-hamburg.de Fri May 17 21:35:16 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!ksuzuki From: ksuzuki@uni-hamburg.de (Kirsty Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May17.213516.7142@uni-hamburg.de> Date: Fri, 17 May 1996 21:35:16 GMT References: <1996May16.103716.5067@tum.de> <1996May17.030516.7280@demon.co.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996May17.030516.7280@demon.co.uk>, krodriguez@demon.co.uk (Kenji Rodríguez) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Kirsty Suzuki -- Universität Hamburg Fachbereich Informatik "The hatch is open. Is anyone listening?" From dsanchez@cam.ac.uk Sun May 19 15:36:16 1996 Path: ashpoly!cascade!mxgate!coyoacan!cam!dsanchez From: dsanchez@cam.ac.uk (Diego Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May19.153616.6564@cam.ac.uk> Date: Sun, 19 May 1996 15:36:16 GMT References: <1996May16.103716.5067@tum.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996May16.103716.5067@tum.de>, etanaka@tum.de (Elaine Tanaka) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Diego Sánchez Tape trading list upon request. SASE required for international mail.