From apopov@utexas.edu Fri Jul 08 07:49:30 1994 Path: ashpoly!cascade!bigsur!utexas!apopov From: apopov@utexas.edu (Anja Popov) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul08.074930.1660@utexas.edu> Date: Fri, 08 Jul 1994 07:49:30 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 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? -- Anja Popov -- University of Texas at Austin "The hatch is open. Is anyone listening?" From iramirez@pacbell.net Fri Jul 08 10:36:30 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!iramirez From: iramirez@pacbell.net (Ines Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul08.103630.7248@pacbell.net> Date: Fri, 08 Jul 1994 10:36:30 GMT References: <1994Jul08.074930.1660@utexas.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jul08.074930.1660@utexas.edu>, apopov@utexas.edu (Anja Popov) 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. -- Ines Ramírez *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From okowalski@unam.mx Fri Jul 08 15:41:30 1994 Path: ashpoly!cascade!mxgate!coyoacan!unam!okowalski From: okowalski@unam.mx (Olga Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul08.154130.6290@unam.mx> Date: Fri, 08 Jul 1994 15:41:30 GMT References: <1994Jul08.074930.1660@utexas.edu> <1994Jul08.103630.7248@pacbell.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jul08.103630.7248@pacbell.net>, iramirez@pacbell.net (Ines Ramírez) 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. -- Olga Kowalski | okowalski@unam.mx PGP Key fingerprint: AEAD 53AE B11C 65D6 "Keep the channels open."