From ksmirnov@unam.mx Fri Feb 17 12:03:22 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!ksmirnov From: ksmirnov@unam.mx (Kenji Smirnov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb17.120322.6634@unam.mx> Date: Fri, 17 Feb 1995 12:03:22 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. 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. -- Kenji Smirnov Tape trading list upon request. SASE required for international mail. From dsokolov@uni-hamburg.de Fri Feb 17 15:09:22 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!dsokolov From: dsokolov@uni-hamburg.de (Dong-hyun Sokolov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb17.150922.8850@uni-hamburg.de> Date: Fri, 17 Feb 1995 15:09:22 GMT References: <1995Feb17.120322.6634@unam.mx> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Feb17.120322.6634@unam.mx>, ksmirnov@unam.mx (Kenji Smirnov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). If you are posting from AOL, please read RFC 1036 before posting again. -- Dong-hyun Sokolov Practical Peripherals 14.4 @ 28,800 bps "Hardware is temporary. The signal survives." From joliveira@earthlink.net Sat Feb 18 18:56:22 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!joliveira From: joliveira@earthlink.net (Jen Oliveira) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb18.185622.2064@earthlink.net> Date: Sat, 18 Feb 1995 18:56:22 GMT References: <1995Feb17.120322.6634@unam.mx> <1995Feb17.150922.8850@uni-hamburg.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb17.150922.8850@uni-hamburg.de>, dsokolov@uni-hamburg.de (Dong-hyun Sokolov) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Jen Oliveira Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From hmacdonald@unam.mx Sun Feb 19 07:07:22 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!hmacdonald From: hmacdonald@unam.mx (Hana MacDonald) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb19.070722.9409@unam.mx> Date: Sun, 19 Feb 1995 07:07:22 GMT References: <1995Feb17.120322.6634@unam.mx> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Feb17.120322.6634@unam.mx>, ksmirnov@unam.mx (Kenji Smirnov) 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. -- Hana MacDonald "When every node is whole, the channel opens." Amiga 1200 (Blizzard 030/50) / NEXTSTEP 3.3 From glopez@kth.se Tue Feb 21 09:15:22 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!glopez From: glopez@kth.se (Graham López) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb21.091522.1740@kth.se> Date: Tue, 21 Feb 1995 09:15:22 GMT References: <1995Feb17.120322.6634@unam.mx> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Feb17.120322.6634@unam.mx>, ksmirnov@unam.mx (Kenji Smirnov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Graham López Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------