From kmoreno@utexas.edu Sat Aug 24 10:17:25 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!kmoreno From: kmoreno@utexas.edu (Katrin Moreno) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug24.101725.3120@utexas.edu> Date: Sat, 24 Aug 1996 10:17:25 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. -- Katrin Moreno | kmoreno@utexas.edu PGP Key fingerprint: C3BF B265 3213 2BE1 "Keep the channels open." From jsantos@netcom.com Sat Aug 24 19:57:25 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!jsantos From: jsantos@netcom.com (Ji-woo Santos) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug24.195725.6395@netcom.com> Date: Sat, 24 Aug 1996 19:57:25 GMT References: <1996Aug24.101725.3120@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Aug24.101725.3120@utexas.edu>, kmoreno@utexas.edu (Katrin Moreno) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Ji-woo Santos Practical Peripherals 14.4 @ 19,200 bps "Measuring a record you own is listening, not piracy." From kgarcia@cam.ac.uk Sun Aug 25 23:26:25 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!kgarcia From: kgarcia@cam.ac.uk (Karen García) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug25.232625.9624@cam.ac.uk> Date: Sun, 25 Aug 1996 23:26:25 GMT References: <1996Aug24.101725.3120@utexas.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Aug24.101725.3120@utexas.edu>, kmoreno@utexas.edu (Katrin Moreno) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Karen García -- University of Cambridge Computer Laboratory "Do not worship the copy." From jsantos@mit.edu Tue Aug 27 23:08:25 1996 Path: ashpoly!cascade!mxgate!coyoacan!mit!jsantos From: jsantos@mit.edu (Joachim Santos) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug27.230825.3863@mit.edu> Date: Tue, 27 Aug 1996 23:08:25 GMT References: <1996Aug24.101725.3120@utexas.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Aug24.101725.3120@utexas.edu>, kmoreno@utexas.edu (Katrin Moreno) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Joachim Santos Tape trading list upon request. SASE required for international mail.