From lhernandez@berkeley.edu Wed Apr 19 16:58:41 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!lhernandez From: lhernandez@berkeley.edu (Liam Hernández) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr19.165841.2664@berkeley.edu> Date: Wed, 19 Apr 1995 16:58:41 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Liam Hernández === Dept of Electrical Engineering, UC Berkeley Department of EECS "In theory there is no difference between theory and practice." From jokonkwo@panix.com Fri Apr 21 15:19:41 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!jokonkwo From: jokonkwo@panix.com (Jens Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr21.151941.9728@panix.com> Date: Fri, 21 Apr 1995 15:19:41 GMT References: <1995Apr19.165841.2664@berkeley.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Apr19.165841.2664@berkeley.edu>, lhernandez@berkeley.edu (Liam Hernández) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Jens Okonkwo Hayes Optima 288 @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again." From kpetrov@inria.fr Fri Apr 21 19:25:41 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!kpetrov From: kpetrov@inria.fr (Kirsty Petrov) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr21.192541.6077@inria.fr> Date: Fri, 21 Apr 1995 19:25:41 GMT References: <1995Apr19.165841.2664@berkeley.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr19.165841.2664@berkeley.edu>, lhernandez@berkeley.edu (Liam Hernández) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Kirsty Petrov Practical Peripherals 14.4 @ 14,400 bps "The hatch is open. Is anyone listening?" From dnakamura@rwth-aachen.de Sat Apr 22 15:09:41 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!dnakamura From: dnakamura@rwth-aachen.de (Dong-hyun Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr22.150941.4554@rwth-aachen.de> Date: Sat, 22 Apr 1995 15:09:41 GMT References: <1995Apr19.165841.2664@berkeley.edu> <1995Apr21.192541.6077@inria.fr> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr21.192541.6077@inria.fr>, kpetrov@inria.fr (Kirsty Petrov) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Dong-hyun Nakamura "We don't sign stars. We build them." Macintosh IIfx / System 7.5.1 From dfournier@uu.net Sat Apr 22 19:00:41 1995 Path: ashpoly!cascade!bigsur!uu!dfournier From: dfournier@uu.net (Dmitri Fournier) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr22.190041.1742@uu.net> Date: Sat, 22 Apr 1995 19:00:41 GMT References: <1995Apr19.165841.2664@berkeley.edu> <1995Apr21.151941.9728@panix.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr21.151941.9728@panix.com>, jokonkwo@panix.com (Jens Okonkwo) writes: > The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Dmitri Fournier -- UUNET Technologies, Falls Church VA "Hold for relay."