From apetrov@demon.co.uk Sat Jun 22 03:19:22 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!apetrov From: apetrov@demon.co.uk (Amy Petrov) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun22.031922.6484@demon.co.uk> Date: Sat, 22 Jun 1996 03:19:22 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Amy Petrov "They will send a copy in my place." Sun SparcStation 20 / FreeBSD 2.1 From rsanchez@uu.net Sun Jun 23 00:36:22 1996 Path: ashpoly!cascade!transat!ukc!fennimore!uu!rsanchez From: rsanchez@uu.net (Raj Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun23.003622.4946@uu.net> Date: Sun, 23 Jun 1996 00:36:22 GMT References: <1996Jun22.031922.6484@demon.co.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jun22.031922.6484@demon.co.uk>, apetrov@demon.co.uk (Amy Petrov) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Raj Sánchez *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From mtakahashi@netcom.com Sun Jun 23 18:55:22 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!mtakahashi From: mtakahashi@netcom.com (Matthias Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun23.185522.2755@netcom.com> Date: Sun, 23 Jun 1996 18:55:22 GMT References: <1996Jun22.031922.6484@demon.co.uk> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jun22.031922.6484@demon.co.uk>, apetrov@demon.co.uk (Amy Petrov) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- === Matthias Takahashi === Dept of Electrical Engineering, NETCOM On-Line Communication Services "A soul is not exclusive to biology." From aokonkwo@netcom.com Tue Jun 25 20:52:22 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!aokonkwo From: aokonkwo@netcom.com (Anja Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun25.205222.2576@netcom.com> Date: Tue, 25 Jun 1996 20:52:22 GMT References: <1996Jun22.031922.6484@demon.co.uk> <1996Jun23.185522.2755@netcom.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun23.185522.2755@netcom.com>, mtakahashi@netcom.com (Matthias Takahashi) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Anja Okonkwo "Hold for relay." Sun 3/60 (SunOS 4.1.1) / SunOS 4.1.4 From ksanchez@kth.se Thu Jun 27 02:33:22 1996 Path: ashpoly!cascade!mxgate!coyoacan!kth!ksanchez From: ksanchez@kth.se (Kenji Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jun27.023322.5235@kth.se> Date: Thu, 27 Jun 1996 02:33:22 GMT References: <1996Jun22.031922.6484@demon.co.uk> <1996Jun23.185522.2755@netcom.com> <1996Jun25.205222.2576@netcom.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jun25.205222.2576@netcom.com>, aokonkwo@netcom.com (Anja Okonkwo) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Kenji Sánchez === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "When every node is whole, the channel opens."