From meriksson@pacbell.net Thu Apr 11 01:56:01 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!meriksson From: meriksson@pacbell.net (Morag Eriksson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr11.015601.2035@pacbell.net> Date: Thu, 11 Apr 1996 01:56:01 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Morag Eriksson Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------ From hmoreau@netcom.com Fri Apr 12 03:07:01 1996 Path: ashpoly!cascade!bigsur!netcom!hmoreau From: hmoreau@netcom.com (Hana Moreau) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr12.030701.2826@netcom.com> Date: Fri, 12 Apr 1996 03:07:01 GMT References: <1996Apr11.015601.2035@pacbell.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Apr11.015601.2035@pacbell.net>, meriksson@pacbell.net (Morag Eriksson) writes: > 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Hana Moreau "Tape doesn't lie at 02:14. Ears do." Pentium 90 (OS/2 Warp) / System 7.5.1 From ppark@unam.mx Sat Apr 13 17:04:01 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!ppark From: ppark@unam.mx (Pavel Park) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr13.170401.3133@unam.mx> Date: Sat, 13 Apr 1996 17:04:01 GMT References: <1996Apr11.015601.2035@pacbell.net> <1996Apr12.030701.2826@netcom.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr12.030701.2826@netcom.com>, hmoreau@netcom.com (Hana Moreau) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Pavel Park *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From skuznetsov@clari.net Mon Apr 15 18:31:01 1996 Path: ashpoly!cascade!mxgate!coyoacan!clari!skuznetsov From: skuznetsov@clari.net (Steve Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr15.183101.1321@clari.net> Date: Mon, 15 Apr 1996 18:31:01 GMT References: <1996Apr11.015601.2035@pacbell.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr11.015601.2035@pacbell.net>, meriksson@pacbell.net (Morag Eriksson) writes: > 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Steve Kuznetsov -- ClariNet Communications Corp "Do not worship the copy." From meriksson@earthlink.net Tue Apr 16 21:11:01 1996 Path: ashpoly!cascade!brgate!saturno!earthlink!meriksson From: meriksson@earthlink.net (Marta Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr16.211101.2438@earthlink.net> Date: Tue, 16 Apr 1996 21:11:01 GMT References: <1996Apr11.015601.2035@pacbell.net> <1996Apr15.183101.1321@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr15.183101.1321@clari.net>, skuznetsov@clari.net (Steve Kuznetsov) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Marta Eriksson Practical Peripherals 14.4 @ ISDN 64k bps "When every node is whole, the channel opens."