From dkowalski@cam.ac.uk Sun Feb 26 08:26:01 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!dkowalski From: dkowalski@cam.ac.uk (Dong-hyun Kowalski) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb26.082601.1408@cam.ac.uk> Date: Sun, 26 Feb 1995 08:26:01 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. 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'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Dong-hyun Kowalski Tape trading list upon request. SASE required for international mail. From mrobertson@utexas.edu Mon Feb 27 08:25:01 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!mrobertson From: mrobertson@utexas.edu (Marta Robertson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb27.082501.1701@utexas.edu> Date: Mon, 27 Feb 1995 08:25:01 GMT References: <1995Feb26.082601.1408@cam.ac.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb26.082601.1408@cam.ac.uk>, dkowalski@cam.ac.uk (Dong-hyun Kowalski) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Marta Robertson "Hardware is temporary. The signal survives." Atari TT030 / FreeBSD 2.1 From yoliveira@pacbell.net Tue Feb 28 12:51:01 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!yoliveira From: yoliveira@pacbell.net (Yuki Oliveira) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Feb28.125101.1907@pacbell.net> Date: Tue, 28 Feb 1995 12:51:01 GMT References: <1995Feb26.082601.1408@cam.ac.uk> <1995Feb27.082501.1701@utexas.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb27.082501.1701@utexas.edu>, mrobertson@utexas.edu (Marta Robertson) 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. -- Yuki Oliveira Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------