From dpetrov@cern.ch Fri Mar 17 08:41:43 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!dpetrov From: dpetrov@cern.ch (Dong-hyun Petrov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar17.084143.3534@cern.ch> Date: Fri, 17 Mar 1995 08:41:43 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Dong-hyun Petrov === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "We don't sign stars. We build them." From tweber@panix.com Sun Mar 19 07:18:43 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!tweber From: tweber@panix.com (Takeshi Weber) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar19.071843.3945@panix.com> Date: Sun, 19 Mar 1995 07:18:43 GMT References: <1995Mar17.084143.3534@cern.ch> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Mar17.084143.3534@cern.ch>, dpetrov@cern.ch (Dong-hyun Petrov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Takeshi Weber -- Public Access Unix of New York "The hatch is open. Is anyone listening?" From smacdonald@berkeley.edu Mon Mar 20 22:57:43 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!smacdonald From: smacdonald@berkeley.edu (Sergei MacDonald) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar20.225743.9687@berkeley.edu> Date: Mon, 20 Mar 1995 22:57:43 GMT References: <1995Mar17.084143.3534@cern.ch> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar17.084143.3534@cern.ch>, dpetrov@cern.ch (Dong-hyun Petrov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Sergei MacDonald *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From hgirard@demon.co.uk Wed Mar 22 00:15:43 1995 Path: ashpoly!cascade!brgate!saturno!demon!hgirard From: hgirard@demon.co.uk (Hugo Girard) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar22.001543.5382@demon.co.uk> Date: Wed, 22 Mar 1995 00:15:43 GMT References: <1995Mar17.084143.3534@cern.ch> <1995Mar19.071843.3945@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar19.071843.3945@panix.com>, tweber@panix.com (Takeshi Weber) 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. -- Hugo Girard | hgirard@demon.co.uk PGP Key fingerprint: 9E44 E20D 37A6 51A8 "Keep the channels open."