From gmoreau@earthlink.net Sun Apr 17 09:58:36 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!gmoreau From: gmoreau@earthlink.net (Graham Moreau) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr17.095836.4932@earthlink.net> Date: Sun, 17 Apr 1994 09:58:36 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Graham Moreau Hayes Optima 288 @ ISDN 64k bps "We don't sign stars. We build them." From tpark@purdue.edu Mon Apr 18 08:11:36 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!tpark From: tpark@purdue.edu (Takeshi Park) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr18.081136.4937@purdue.edu> Date: Mon, 18 Apr 1994 08:11:36 GMT References: <1994Apr17.095836.4932@earthlink.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Apr17.095836.4932@earthlink.net>, gmoreau@earthlink.net (Graham Moreau) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Takeshi Park *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From rchoi@mit.edu Mon Apr 18 10:19:36 1994 Path: ashpoly!cascade!brgate!saturno!mit!rchoi From: rchoi@mit.edu (Rodrigo Choi) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr18.101936.8902@mit.edu> Date: Mon, 18 Apr 1994 10:19:36 GMT References: <1994Apr17.095836.4932@earthlink.net> <1994Apr18.081136.4937@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Apr18.081136.4937@purdue.edu>, tpark@purdue.edu (Takeshi Park) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Rodrigo Choi Tape trading list upon request. SASE required for international mail. From gsokolov@purdue.edu Mon Apr 18 14:06:36 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!gsokolov From: gsokolov@purdue.edu (Graham Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr18.140636.2346@purdue.edu> Date: Mon, 18 Apr 1994 14:06:36 GMT References: <1994Apr17.095836.4932@earthlink.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Apr17.095836.4932@earthlink.net>, gmoreau@earthlink.net (Graham Moreau) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Graham Sokolov | gsokolov@purdue.edu PGP Key fingerprint: 020E 7BEA 78DE A4FB "Keep the channels open."