From mnakamura@ox.ac.uk Fri Jul 21 07:54:06 1995 Path: ashpoly!cascade!transat!ukc!fennimore!ox!mnakamura From: mnakamura@ox.ac.uk (Mateo Nakamura) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul21.075406.9356@ox.ac.uk> Date: Fri, 21 Jul 1995 07:54:06 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Mateo Nakamura Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------ From ksouza@tum.de Sun Jul 23 03:59:06 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!ksouza From: ksouza@tum.de (Kirsty Souza) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul23.035906.4296@tum.de> Date: Sun, 23 Jul 1995 03:59:06 GMT References: <1995Jul21.075406.9356@ox.ac.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jul21.075406.9356@ox.ac.uk>, mnakamura@ox.ac.uk (Mateo Nakamura) 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. 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. -- Kirsty Souza SupraFAXModem 28.8 @ 19,200 bps "When every node is whole, the channel opens." From kkang@rwth-aachen.de Sun Jul 23 14:41:06 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!kkang From: kkang@rwth-aachen.de (Katrin Kang) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul23.144106.5566@rwth-aachen.de> Date: Sun, 23 Jul 1995 14:41:06 GMT References: <1995Jul21.075406.9356@ox.ac.uk> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul21.075406.9356@ox.ac.uk>, mnakamura@ox.ac.uk (Mateo Nakamura) 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. -- Katrin Kang Practical Peripherals 14.4 @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again." From nduarte@purdue.edu Tue Jul 25 15:28:06 1995 Path: ashpoly!cascade!brgate!saturno!purdue!nduarte From: nduarte@purdue.edu (Nadia Duarte) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul25.152806.8611@purdue.edu> Date: Tue, 25 Jul 1995 15:28:06 GMT References: <1995Jul21.075406.9356@ox.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jul21.075406.9356@ox.ac.uk>, mnakamura@ox.ac.uk (Mateo Nakamura) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Nadia Duarte -- Purdue University Engineering Computer Network "Measuring a record you own is listening, not piracy." From tmacdonald@u-tokyo.ac.jp Wed Jul 26 23:09:06 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!tmacdonald From: tmacdonald@u-tokyo.ac.jp (Tyler MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul26.230906.5505@u-tokyo.ac.jp> Date: Wed, 26 Jul 1995 23:09:06 GMT References: <1995Jul21.075406.9356@ox.ac.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jul21.075406.9356@ox.ac.uk>, mnakamura@ox.ac.uk (Mateo Nakamura) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Tyler MacDonald === Dept of Electrical Engineering, University of Tokyo Department of Information Science "The carrier frequency does not drift by accident."