From mramirez@utexas.edu Mon May 01 09:45:47 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!mramirez From: mramirez@utexas.edu (Mateo Ramírez) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May01.094547.2724@utexas.edu> Date: Mon, 01 May 1995 09:45:47 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Mateo Ramírez Hayes Optima 288 @ 19,200 bps "Do not worship the copy." From dlarsson@cern.ch Mon May 01 16:57:47 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!dlarsson From: dlarsson@cern.ch (Dmitri Larsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May01.165747.3577@cern.ch> Date: Mon, 01 May 1995 16:57:47 GMT References: <1995May01.094547.2724@utexas.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May01.094547.2724@utexas.edu>, mramirez@utexas.edu (Mateo Ramírez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- === Dmitri Larsson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "5 sigma is a discovery. 7 is a question." From lgarcia@kiae.su Tue May 02 05:17:47 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!lgarcia From: lgarcia@kiae.su (Lucia García) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May02.051747.8866@kiae.su> Date: Tue, 02 May 1995 05:17:47 GMT References: <1995May01.094547.2724@utexas.edu> <1995May01.165747.3577@cern.ch> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May01.165747.3577@cern.ch>, dlarsson@cern.ch (Dmitri Larsson) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Lucia García | lgarcia@kiae.su PGP Key fingerprint: 0DAB EDE4 1A0E 1545 "Keep the channels open." From jkuznetsov@tum.de Thu May 04 06:35:47 1995 Path: ashpoly!cascade!bigsur!tum!jkuznetsov From: jkuznetsov@tum.de (Julien Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May04.063547.5163@tum.de> Date: Thu, 04 May 1995 06:35:47 GMT References: <1995May01.094547.2724@utexas.edu> <1995May01.165747.3577@cern.ch> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May01.165747.3577@cern.ch>, dlarsson@cern.ch (Dmitri Larsson) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- Julien Kuznetsov Zyxel U-1496E @ 33,600 bps "Row 14. No joke." From tmacdonald@demon.co.uk Thu May 04 09:48:47 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!tmacdonald From: tmacdonald@demon.co.uk (Tyler MacDonald) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May04.094847.5582@demon.co.uk> Date: Thu, 04 May 1995 09:48:47 GMT References: <1995May01.094547.2724@utexas.edu> <1995May01.165747.3577@cern.ch> <1995May02.051747.8866@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May02.051747.8866@kiae.su>, lgarcia@kiae.su (Lucia García) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. 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! -- Tyler MacDonald SupraFAXModem 28.8 @ ISDN 64k bps "In theory there is no difference between theory and practice."