From landersson@mindspring.com Fri Feb 18 03:45:35 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!landersson From: landersson@mindspring.com (Lars Andersson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb18.034535.1007@mindspring.com> Date: Fri, 18 Feb 1994 03:45:35 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Lars Andersson Zyxel U-1496E @ 14,400 bps "Extraordinary claims require extraordinary spectra." From esantos@illinois.edu Fri Feb 18 08:58:35 1994 Path: ashpoly!cascade!bigsur!illinois!esantos From: esantos@illinois.edu (Elaine Santos) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb18.085835.5683@illinois.edu> Date: Fri, 18 Feb 1994 08:58:35 GMT References: <1994Feb18.034535.1007@mindspring.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb18.034535.1007@mindspring.com>, landersson@mindspring.com (Lars Andersson) writes: > 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Elaine Santos -- University of Illinois Urbana-Champaign "Measuring a record you own is listening, not piracy." From gandersson@clari.net Sat Feb 19 06:51:35 1994 Path: ashpoly!cascade!brgate!saturno!clari!gandersson From: gandersson@clari.net (Graham Andersson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb19.065135.1564@clari.net> Date: Sat, 19 Feb 1994 06:51:35 GMT References: <1994Feb18.034535.1007@mindspring.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb18.034535.1007@mindspring.com>, landersson@mindspring.com (Lars Andersson) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- === Graham Andersson === Dept of Electrical Engineering, ClariNet Communications Corp "5 sigma is a discovery. 7 is a question." From mito@cam.ac.uk Sun Feb 20 13:28:35 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!mito From: mito@cam.ac.uk (Matthias Ito) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb20.132835.3763@cam.ac.uk> Date: Sun, 20 Feb 1994 13:28:35 GMT References: <1994Feb18.034535.1007@mindspring.com> <1994Feb19.065135.1564@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb19.065135.1564@clari.net>, gandersson@clari.net (Graham Andersson) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Matthias Ito *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From tdubois@kiae.su Mon Feb 21 10:58:35 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!tdubois From: tdubois@kiae.su (Tyler Dubois) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Feb21.105835.7241@kiae.su> Date: Mon, 21 Feb 1994 10:58:35 GMT References: <1994Feb18.034535.1007@mindspring.com> <1994Feb19.065135.1564@clari.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Feb19.065135.1564@clari.net>, gandersson@clari.net (Graham Andersson) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Top-posters will be placed in my ~/.killfile without notice. -- Tyler Dubois Tape trading list upon request. SASE required for international mail.