From tnilsson@panix.com Wed Feb 28 07:42:04 1996 Path: ashpoly!cascade!mxgate!coyoacan!panix!tnilsson From: tnilsson@panix.com (Takeshi Nilsson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb28.074204.3871@panix.com> Date: Wed, 28 Feb 1996 07:42:04 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Takeshi Nilsson Hayes Optima 288 @ 33,600 bps "We don't sign stars. We build them." From emoreno@hanse.de Thu Feb 29 20:45:04 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!emoreno From: emoreno@hanse.de (Elaine Moreno) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb29.204504.9162@hanse.de> Date: Thu, 29 Feb 1996 20:45:04 GMT References: <1996Feb28.074204.3871@panix.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Feb28.074204.3871@panix.com>, tnilsson@panix.com (Takeshi Nilsson) 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. -- Elaine Moreno -- Hanse-Netzwerk Hamburg "Measuring a record you own is listening, not piracy." From msouza@utexas.edu Sat Mar 02 13:28:04 1996 Path: ashpoly!cascade!bigsur!utexas!msouza From: msouza@utexas.edu (Mathieu Souza) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar02.132804.3390@utexas.edu> Date: Sat, 02 Mar 1996 13:28:04 GMT References: <1996Feb28.074204.3871@panix.com> <1996Feb29.204504.9162@hanse.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Feb29.204504.9162@hanse.de>, emoreno@hanse.de (Elaine Moreno) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Mathieu Souza Tape trading list upon request. SASE required for international mail. From mlaurent@illinois.edu Mon Mar 04 11:12:04 1996 Path: ashpoly!cascade!mxgate!coyoacan!illinois!mlaurent From: mlaurent@illinois.edu (Mathieu Laurent) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar04.111204.4628@illinois.edu> Date: Mon, 04 Mar 1996 11:12:04 GMT References: <1996Feb28.074204.3871@panix.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb28.074204.3871@panix.com>, tnilsson@panix.com (Takeshi Nilsson) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Mathieu Laurent Hayes Optima 288 @ ISDN 64k bps "In theory there is no difference between theory and practice." From dsokolov@purdue.edu Tue Mar 05 06:31:04 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!dsokolov From: dsokolov@purdue.edu (Dmitri Sokolov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar05.063104.9780@purdue.edu> Date: Tue, 05 Mar 1996 06:31:04 GMT References: <1996Feb28.074204.3871@panix.com> <1996Mar04.111204.4628@illinois.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Mar04.111204.4628@illinois.edu>, mlaurent@illinois.edu (Mathieu Laurent) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Top-posters will be placed in my ~/.killfile without notice. -- Dmitri Sokolov | dsokolov@purdue.edu PGP Key fingerprint: D936 9FC6 8CF7 C784 "Keep the channels open."