From ecampbell@clari.net Wed Feb 21 15:48:25 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!ecampbell From: ecampbell@clari.net (Élodie Campbell) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb21.154825.2172@clari.net> Date: Wed, 21 Feb 1996 15:48:25 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N 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. -- Élodie Campbell *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From rbrennan@tum.de Thu Feb 22 14:25:25 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!rbrennan From: rbrennan@tum.de (Renata Brennan) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb22.142525.9156@tum.de> Date: Thu, 22 Feb 1996 14:25:25 GMT References: <1996Feb21.154825.2172@clari.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Feb21.154825.2172@clari.net>, ecampbell@clari.net (Élodie Campbell) 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. -- Renata Brennan US Robotics Courier V.34 @ 14,400 bps "5 sigma is a discovery. 7 is a question." From tduarte@kth.se Fri Feb 23 22:25:25 1996 Path: ashpoly!cascade!mxgate!coyoacan!kth!tduarte From: tduarte@kth.se (Tobias Duarte) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Feb23.222525.9467@kth.se> Date: Fri, 23 Feb 1996 22:25:25 GMT References: <1996Feb21.154825.2172@clari.net> <1996Feb22.142525.9156@tum.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Feb22.142525.9156@tum.de>, rbrennan@tum.de (Renata Brennan) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Tobias Duarte "In theory there is no difference between theory and practice." Pentium 90 (OS/2 Warp) / AmigaOS 3.1