From ltanaka@cam.ac.uk Thu May 09 01:21:53 1996 Path: ashpoly!cascade!bigsur!cam!ltanaka From: ltanaka@cam.ac.uk (Liam Tanaka) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May09.012153.3648@cam.ac.uk> Date: Thu, 09 May 1996 01:21:53 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Liam Tanaka Tape trading list upon request. SASE required for international mail. From mrobertson@clari.net Fri May 10 13:01:53 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!mrobertson From: mrobertson@clari.net (Mathieu Robertson) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May10.130153.4425@clari.net> Date: Fri, 10 May 1996 13:01:53 GMT References: <1996May09.012153.3648@cam.ac.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May09.012153.3648@cam.ac.uk>, ltanaka@cam.ac.uk (Liam Tanaka) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Mathieu Robertson SupraFAXModem 28.8 @ 28,800 bps "Hold for relay."