From htanaka@cam.ac.uk Fri Dec 15 15:39:27 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!htanaka From: htanaka@cam.ac.uk (Hana Tanaka) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec15.153927.9784@cam.ac.uk> Date: Fri, 15 Dec 1995 15:39:27 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. 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. -- Hana Tanaka Zyxel U-1496E @ ISDN 64k bps "Marcus is not one man." From lrobertson@ox.ac.uk Sun Dec 17 01:02:27 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!lrobertson From: lrobertson@ox.ac.uk (Lars Robertson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec17.010227.5593@ox.ac.uk> Date: Sun, 17 Dec 1995 01:02:27 GMT References: <1995Dec15.153927.9784@cam.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec15.153927.9784@cam.ac.uk>, htanaka@cam.ac.uk (Hana 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. -- Lars Robertson Opinions expressed are solely my own and not those of Oxford University Computing Laboratory. ------------------------------------------------------------