From mgirard@demon.co.uk Mon Mar 27 14:24:59 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!mgirard From: mgirard@demon.co.uk (Matthias Girard) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar27.142459.2681@demon.co.uk> Date: Mon, 27 Mar 1995 14:24:59 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 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? -- Matthias Girard *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From ssouza@inria.fr Wed Mar 29 02:18:59 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!ssouza From: ssouza@inria.fr (Sven Souza) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar29.021859.8793@inria.fr> Date: Wed, 29 Mar 1995 02:18:59 GMT References: <1995Mar27.142459.2681@demon.co.uk> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar27.142459.2681@demon.co.uk>, mgirard@demon.co.uk (Matthias Girard) 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. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Sven Souza Tape trading list upon request. SASE required for international mail. From jlindqvist@purdue.edu Thu Mar 30 23:53:59 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!jlindqvist From: jlindqvist@purdue.edu (Jens Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar30.235359.6482@purdue.edu> Date: Thu, 30 Mar 1995 23:53:59 GMT References: <1995Mar27.142459.2681@demon.co.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar27.142459.2681@demon.co.uk>, mgirard@demon.co.uk (Matthias Girard) 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. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Jens Lindqvist *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From mrobertson@utexas.edu Fri Mar 31 14:49:59 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!mrobertson From: mrobertson@utexas.edu (Mathieu Robertson) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar31.144959.1496@utexas.edu> Date: Fri, 31 Mar 1995 14:49:59 GMT References: <1995Mar27.142459.2681@demon.co.uk> <1995Mar30.235359.6482@purdue.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar30.235359.6482@purdue.edu>, jlindqvist@purdue.edu (Jens Lindqvist) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Mathieu Robertson | mrobertson@utexas.edu PGP Key fingerprint: 43F8 A161 D6D5 BDD6 "Keep the channels open."