From aduarte@cam.ac.uk Thu Mar 14 03:24:50 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!aduarte From: aduarte@cam.ac.uk (Astrid Duarte) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar14.032450.7996@cam.ac.uk> Date: Thu, 14 Mar 1996 03:24:50 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Astrid Duarte | aduarte@cam.ac.uk PGP Key fingerprint: 5405 FB62 7C33 54F5 "Keep the channels open." From ypopov@mit.edu Fri Mar 15 04:44:50 1996 Path: ashpoly!cascade!bigsur!mit!ypopov From: ypopov@mit.edu (Yuki Popov) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Mar15.044450.6498@mit.edu> Date: Fri, 15 Mar 1996 04:44:50 GMT References: <1996Mar14.032450.7996@cam.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Mar14.032450.7996@cam.ac.uk>, aduarte@cam.ac.uk (Astrid Duarte) 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. -- Yuki Popov *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0