From hbrennan@kiae.su Sun Jan 21 12:35:48 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!hbrennan From: hbrennan@kiae.su (Hugo Brennan) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan21.123548.5044@kiae.su> Date: Sun, 21 Jan 1996 12:35:48 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. 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? -- Hugo Brennan "Marcus is not one man." NeXTstation Turbo Color / NEXTSTEP 3.3 From hsokolov@hanse.de Sun Jan 21 15:43:48 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!hsokolov From: hsokolov@hanse.de (Hana Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan21.154348.9294@hanse.de> Date: Sun, 21 Jan 1996 15:43:48 GMT References: <1996Jan21.123548.5044@kiae.su> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jan21.123548.5044@kiae.su>, hbrennan@kiae.su (Hugo Brennan) 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. Top-posters will be placed in my ~/.killfile without notice. -- === Hana Sokolov === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "Row 14. No joke." From hsmirnov@demon.co.uk Mon Jan 22 22:52:48 1996 Path: ashpoly!cascade!brgate!saturno!demon!hsmirnov From: hsmirnov@demon.co.uk (Heather Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan22.225248.3401@demon.co.uk> Date: Mon, 22 Jan 1996 22:52:48 GMT References: <1996Jan21.123548.5044@kiae.su> <1996Jan21.154348.9294@hanse.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jan21.154348.9294@hanse.de>, hsokolov@hanse.de (Hana Sokolov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. > Top-posters will be placed in my ~/.killfile without notice. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Heather Smirnov | hsmirnov@demon.co.uk PGP Key fingerprint: E8EC 0348 8F47 09C2 "Keep the channels open." From hivanov@u-tokyo.ac.jp Thu Jan 25 01:26:48 1996 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!hivanov From: hivanov@u-tokyo.ac.jp (Hugo Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan25.012648.1593@u-tokyo.ac.jp> Date: Thu, 25 Jan 1996 01:26:48 GMT References: <1996Jan21.123548.5044@kiae.su> <1996Jan21.154348.9294@hanse.de> <1996Jan22.225248.3401@demon.co.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan22.225248.3401@demon.co.uk>, hsmirnov@demon.co.uk (Heather Smirnov) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Hugo Ivanov "5 sigma is a discovery. 7 is a question." PC-9821Ap2 (NEC) / NEXTSTEP 3.3 From msanchez@pipeline.com Thu Jan 25 16:11:48 1996 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!msanchez From: msanchez@pipeline.com (Mike Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan25.161148.8863@pipeline.com> Date: Thu, 25 Jan 1996 16:11:48 GMT References: <1996Jan21.123548.5044@kiae.su> <1996Jan21.154348.9294@hanse.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jan21.154348.9294@hanse.de>, hsokolov@hanse.de (Hana Sokolov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. > Top-posters will be placed in my ~/.killfile without notice. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Mike Sánchez "Hold for relay." 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3