From jlee@netcom.com Thu Sep 14 05:12:57 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!jlee From: jlee@netcom.com (Ji-woo Lee) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep14.051257.7380@netcom.com> Date: Thu, 14 Sep 1995 05:12:57 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.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? -- Ji-woo Lee *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From rpetrov@uu.net Fri Sep 15 23:07:57 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!rpetrov From: rpetrov@uu.net (Rodrigo Petrov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep15.230757.4384@uu.net> Date: Fri, 15 Sep 1995 23:07:57 GMT References: <1995Sep14.051257.7380@netcom.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Sep14.051257.7380@netcom.com>, jlee@netcom.com (Ji-woo 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Rodrigo Petrov SupraFAXModem 28.8 @ 33,600 bps "When every node is whole, the channel opens." From bokonkwo@cam.ac.uk Sun Sep 17 20:41:57 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!bokonkwo From: bokonkwo@cam.ac.uk (Brian Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep17.204157.4809@cam.ac.uk> Date: Sun, 17 Sep 1995 20:41:57 GMT References: <1995Sep14.051257.7380@netcom.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Sep14.051257.7380@netcom.com>, jlee@netcom.com (Ji-woo Lee) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Brian Okonkwo Tape trading list upon request. SASE required for international mail. From bmoreno@delphi.com Tue Sep 19 04:29:57 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!bmoreno From: bmoreno@delphi.com (Bastien Moreno) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep19.042957.7912@delphi.com> Date: Tue, 19 Sep 1995 04:29:57 GMT References: <1995Sep14.051257.7380@netcom.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Sep14.051257.7380@netcom.com>, jlee@netcom.com (Ji-woo 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. If you are posting from AOL, please read RFC 1036 before posting again. -- === Bastien Moreno === Dept of Electrical Engineering, Delphi Internet Services "The carrier frequency does not drift by accident." From dkarlsson@mindspring.com Tue Sep 19 12:44:57 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!dkarlsson From: dkarlsson@mindspring.com (Dong-hyun Karlsson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep19.124457.1930@mindspring.com> Date: Tue, 19 Sep 1995 12:44:57 GMT References: <1995Sep14.051257.7380@netcom.com> <1995Sep15.230757.4384@uu.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep15.230757.4384@uu.net>, rpetrov@uu.net (Rodrigo Petrov) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Dong-hyun Karlsson Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------