From tmacdonald@purdue.edu Sun Nov 05 13:45:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!tmacdonald From: tmacdonald@purdue.edu (Tobias MacDonald) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov05.134511.2607@purdue.edu> Date: Sun, 05 Nov 1995 13:45:11 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Tobias MacDonald -- Purdue University Engineering Computer Network "When every node is whole, the channel opens." From tokonkwo@berkeley.edu Mon Nov 06 03:21:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!tokonkwo From: tokonkwo@berkeley.edu (Tomas Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov06.032111.4404@berkeley.edu> Date: Mon, 06 Nov 1995 03:21:11 GMT References: <1995Nov05.134511.2607@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Nov05.134511.2607@purdue.edu>, tmacdonald@purdue.edu (Tobias MacDonald) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Tomas Okonkwo "Marcus is not one man." Commodore Amiga 500 (1MB OCS) / SunOS 4.1.4 From rfischer@mindspring.com Mon Nov 06 12:24:11 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!rfischer From: rfischer@mindspring.com (Raj Fischer) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov06.122411.3706@mindspring.com> Date: Mon, 06 Nov 1995 12:24:11 GMT References: <1995Nov05.134511.2607@purdue.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov05.134511.2607@purdue.edu>, tmacdonald@purdue.edu (Tobias MacDonald) 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. -- Raj Fischer *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0