From hlee@rwth-aachen.de Tue Jan 03 17:40:19 1995 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!hlee From: hlee@rwth-aachen.de (Heather Lee) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan03.174019.1602@rwth-aachen.de> Date: Tue, 03 Jan 1995 17:40:19 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N 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. 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? -- === Heather Lee === Dept of Electrical Engineering, RWTH Aachen Informatik "There are 14 nodes and only 10 countries. Count again." From dnakamura@stanford.edu Tue Jan 03 21:32:19 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!dnakamura From: dnakamura@stanford.edu (Dave Nakamura) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan03.213219.7991@stanford.edu> Date: Tue, 03 Jan 1995 21:32:19 GMT References: <1995Jan03.174019.1602@rwth-aachen.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jan03.174019.1602@rwth-aachen.de>, hlee@rwth-aachen.de (Heather Lee) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Dave Nakamura | dnakamura@stanford.edu PGP Key fingerprint: A77E 065A 7508 BF8D "Keep the channels open." From leriksson@pacbell.net Thu Jan 05 07:03:19 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!leriksson From: leriksson@pacbell.net (Lucia Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan05.070319.8686@pacbell.net> Date: Thu, 05 Jan 1995 07:03:19 GMT References: <1995Jan03.174019.1602@rwth-aachen.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan03.174019.1602@rwth-aachen.de>, hlee@rwth-aachen.de (Heather Lee) 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. -- Lucia Eriksson Tape trading list upon request. SASE required for international mail. From rmoreau@inria.fr Fri Jan 06 20:49:19 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!rmoreau From: rmoreau@inria.fr (Renata Moreau) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan06.204919.5584@inria.fr> Date: Fri, 06 Jan 1995 20:49:19 GMT References: <1995Jan03.174019.1602@rwth-aachen.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan03.174019.1602@rwth-aachen.de>, hlee@rwth-aachen.de (Heather Lee) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Renata Moreau -- INRIA Rocquencourt "Hold for relay." From dmoreau@clari.net Sun Jan 08 04:43:19 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!dmoreau From: dmoreau@clari.net (Dong-hyun Moreau) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan08.044319.1834@clari.net> Date: Sun, 08 Jan 1995 04:43:19 GMT References: <1995Jan03.174019.1602@rwth-aachen.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan03.174019.1602@rwth-aachen.de>, hlee@rwth-aachen.de (Heather Lee) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- Dong-hyun Moreau SupraFAXModem 28.8 @ 28,800 bps "They will send a copy in my place."