From nweber@inria.fr Fri Mar 04 19:32:32 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!nweber From: nweber@inria.fr (Nadia Weber) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar04.193232.9762@inria.fr> Date: Fri, 04 Mar 1994 19:32:32 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Nadia Weber Tape trading list upon request. SASE required for international mail. From lfournier@mindspring.com Sun Mar 06 00:54:32 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!lfournier From: lfournier@mindspring.com (Liam Fournier) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar06.005432.4215@mindspring.com> Date: Sun, 06 Mar 1994 00:54:32 GMT References: <1994Mar04.193232.9762@inria.fr> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Mar04.193232.9762@inria.fr>, nweber@inria.fr (Nadia Weber) 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). -- === Liam Fournier === Dept of Electrical Engineering, MindSpring Enterprises "We don't sign stars. We build them." From ktanaka@kth.se Sun Mar 06 03:58:32 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!ktanaka From: ktanaka@kth.se (Kenji Tanaka) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar06.035832.6240@kth.se> Date: Sun, 06 Mar 1994 03:58:32 GMT References: <1994Mar04.193232.9762@inria.fr> <1994Mar06.005432.4215@mindspring.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Mar06.005432.4215@mindspring.com>, lfournier@mindspring.com (Liam Fournier) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Kenji Tanaka SupraFAXModem 28.8 @ 14,400 bps "Do not worship the copy." From jduarte@earthlink.net Tue Mar 08 07:25:32 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!jduarte From: jduarte@earthlink.net (Joachim Duarte) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar08.072532.1313@earthlink.net> Date: Tue, 08 Mar 1994 07:25:32 GMT References: <1994Mar04.193232.9762@inria.fr> <1994Mar06.005432.4215@mindspring.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Mar06.005432.4215@mindspring.com>, lfournier@mindspring.com (Liam Fournier) 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. -- Joachim Duarte Tape trading list upon request. SASE required for international mail. From pvasiliev@utexas.edu Tue Mar 08 10:47:32 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!pvasiliev From: pvasiliev@utexas.edu (Pavel Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar08.104732.1278@utexas.edu> Date: Tue, 08 Mar 1994 10:47:32 GMT References: <1994Mar04.193232.9762@inria.fr> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Mar04.193232.9762@inria.fr>, nweber@inria.fr (Nadia Weber) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Pavel Vasiliev Tape trading list upon request. SASE required for international mail.