From arodriguez@netcom.com Tue Apr 23 07:42:42 1996 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!arodriguez From: arodriguez@netcom.com (Anja Rodríguez) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr23.074242.4696@netcom.com> Date: Tue, 23 Apr 1996 07:42:42 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.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. 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Anja Rodríguez Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From jlindqvist@kiae.su Wed Apr 24 15:20:42 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!jlindqvist From: jlindqvist@kiae.su (Ji-woo Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr24.152042.8589@kiae.su> Date: Wed, 24 Apr 1996 15:20:42 GMT References: <1996Apr23.074242.4696@netcom.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr23.074242.4696@netcom.com>, arodriguez@netcom.com (Anja Rodríguez) 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. -- Ji-woo Lindqvist *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From achoi@pacbell.net Thu Apr 25 05:55:42 1996 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!achoi From: achoi@pacbell.net (Astrid Choi) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr25.055542.2234@pacbell.net> Date: Thu, 25 Apr 1996 05:55:42 GMT References: <1996Apr23.074242.4696@netcom.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Apr23.074242.4696@netcom.com>, arodriguez@netcom.com (Anja Rodríguez) 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. -- Astrid Choi "There are 14 nodes and only 10 countries. Count again." Acorn RiscPC 600 / NEXTSTEP 3.3 From jsantos@rwth-aachen.de Sat Apr 27 00:08:42 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!jsantos From: jsantos@rwth-aachen.de (Jen Santos) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr27.000842.5579@rwth-aachen.de> Date: Sat, 27 Apr 1996 00:08:42 GMT References: <1996Apr23.074242.4696@netcom.com> <1996Apr25.055542.2234@pacbell.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr25.055542.2234@pacbell.net>, achoi@pacbell.net (Astrid Choi) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Jen Santos *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From ntanaka@pipeline.com Sun Apr 28 18:04:42 1996 Path: ashpoly!cascade!brgate!saturno!pipeline!ntanaka From: ntanaka@pipeline.com (Natalia Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr28.180442.6937@pipeline.com> Date: Sun, 28 Apr 1996 18:04:42 GMT References: <1996Apr23.074242.4696@netcom.com> <1996Apr25.055542.2234@pacbell.net> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Apr25.055542.2234@pacbell.net>, achoi@pacbell.net (Astrid Choi) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Natalia Tanaka *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0