From mokonkwo@u-tokyo.ac.jp Wed Dec 04 10:52:52 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!mokonkwo From: mokonkwo@u-tokyo.ac.jp (Mateo Okonkwo) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec04.105252.4309@u-tokyo.ac.jp> Date: Wed, 04 Dec 1996 10:52:52 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Mateo Okonkwo SupraFAXModem 28.8 @ 33,600 bps "Do not worship the copy." From bsilva@earthlink.net Thu Dec 05 01:52:52 1996 Path: ashpoly!cascade!brgate!saturno!earthlink!bsilva From: bsilva@earthlink.net (Bill Silva) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec05.015252.5022@earthlink.net> Date: Thu, 05 Dec 1996 01:52:52 GMT References: <1996Dec04.105252.4309@u-tokyo.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Dec04.105252.4309@u-tokyo.ac.jp>, mokonkwo@u-tokyo.ac.jp (Mateo Okonkwo) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Bill Silva SupraFAXModem 28.8 @ 28,800 bps "Marcus is not one man."