From ghughes@uni-hamburg.de Sun Sep 15 02:50:01 1996 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!ghughes From: ghughes@uni-hamburg.de (Göran Hughes) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep15.025001.4030@uni-hamburg.de> Date: Sun, 15 Sep 1996 02:50:01 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. 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? -- Göran Hughes *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From mbrennan@hanse.de Sun Sep 15 23:21:01 1996 Path: ashpoly!cascade!mxgate!coyoacan!hanse!mbrennan From: mbrennan@hanse.de (Marisol Brennan) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep15.232101.3434@hanse.de> Date: Sun, 15 Sep 1996 23:21:01 GMT References: <1996Sep15.025001.4030@uni-hamburg.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Sep15.025001.4030@uni-hamburg.de>, ghughes@uni-hamburg.de (Göran Hughes) 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. -- Marisol Brennan US Robotics Courier V.34 @ 33,600 bps "Extraordinary claims require extraordinary spectra." From jkuznetsov@panix.com Tue Sep 17 21:04:01 1996 Path: ashpoly!cascade!bigsur!panix!jkuznetsov From: jkuznetsov@panix.com (Joachim Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep17.210401.3936@panix.com> Date: Tue, 17 Sep 1996 21:04:01 GMT References: <1996Sep15.025001.4030@uni-hamburg.de> <1996Sep15.232101.3434@hanse.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep15.232101.3434@hanse.de>, mbrennan@hanse.de (Marisol Brennan) 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. -- Joachim Kuznetsov | jkuznetsov@panix.com PGP Key fingerprint: 4B8D 59BA 2953 24D9 "Keep the channels open."