From jreyes@u-tokyo.ac.jp Fri May 05 03:56:03 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!jreyes From: jreyes@u-tokyo.ac.jp (Jen Reyes) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May05.035603.3774@u-tokyo.ac.jp> Date: Fri, 05 May 1995 03:56:03 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. 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? -- Jen Reyes Practical Peripherals 14.4 @ 19,200 bps "Tape doesn't lie at 02:14. Ears do." From amoreno@uni-hamburg.de Sun May 07 07:14:03 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!amoreno From: amoreno@uni-hamburg.de (Aiko Moreno) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May07.071403.5431@uni-hamburg.de> Date: Sun, 07 May 1995 07:14:03 GMT References: <1995May05.035603.3774@u-tokyo.ac.jp> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May05.035603.3774@u-tokyo.ac.jp>, jreyes@u-tokyo.ac.jp (Jen Reyes) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Aiko Moreno Tape trading list upon request. SASE required for international mail. From mstewart@stanford.edu Sun May 07 21:10:03 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!mstewart From: mstewart@stanford.edu (Mike Stewart) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May07.211003.3667@stanford.edu> Date: Sun, 07 May 1995 21:10:03 GMT References: <1995May05.035603.3774@u-tokyo.ac.jp> <1995May07.071403.5431@uni-hamburg.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May07.071403.5431@uni-hamburg.de>, amoreno@uni-hamburg.de (Aiko Moreno) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > If you are posting from AOL, please read RFC 1036 before posting again. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Mike Stewart *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0