From mhughes@utexas.edu Wed Jul 19 10:57:26 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!mhughes From: mhughes@utexas.edu (Mateo Hughes) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul19.105726.9388@utexas.edu> Date: Wed, 19 Jul 1995 10:57:26 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 10 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 board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Mateo Hughes -- University of Texas at Austin "In theory there is no difference between theory and practice." From mtakahashi@clari.net Wed Jul 19 20:23:26 1995 Path: ashpoly!cascade!transat!ukc!fennimore!clari!mtakahashi From: mtakahashi@clari.net (Mateo Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul19.202326.9575@clari.net> Date: Wed, 19 Jul 1995 20:23:26 GMT References: <1995Jul19.105726.9388@utexas.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jul19.105726.9388@utexas.edu>, mhughes@utexas.edu (Mateo Hughes) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Mateo Takahashi Tape trading list upon request. SASE required for international mail. From bfournier@unam.mx Thu Jul 20 08:01:26 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!bfournier From: bfournier@unam.mx (Bill Fournier) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul20.080126.1032@unam.mx> Date: Thu, 20 Jul 1995 08:01:26 GMT References: <1995Jul19.105726.9388@utexas.edu> <1995Jul19.202326.9575@clari.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jul19.202326.9575@clari.net>, mtakahashi@clari.net (Mateo Takahashi) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Bill Fournier Tape trading list upon request. SASE required for international mail. From mlopez@purdue.edu Fri Jul 21 13:54:26 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!mlopez From: mlopez@purdue.edu (Marisol López) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul21.135426.8006@purdue.edu> Date: Fri, 21 Jul 1995 13:54:26 GMT References: <1995Jul19.105726.9388@utexas.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul19.105726.9388@utexas.edu>, mhughes@utexas.edu (Mateo Hughes) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Marisol López *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0