From nduarte@pacbell.net Tue Apr 18 21:50:58 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!nduarte From: nduarte@pacbell.net (Nadine Duarte) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr18.215058.4877@pacbell.net> Date: Tue, 18 Apr 1995 21:50:58 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net 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. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Nadine Duarte *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From mmuller@inria.fr Thu Apr 20 02:28:58 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!mmuller From: mmuller@inria.fr (Matthias Müller) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr20.022858.7022@inria.fr> Date: Thu, 20 Apr 1995 02:28:58 GMT References: <1995Apr18.215058.4877@pacbell.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Apr18.215058.4877@pacbell.net>, nduarte@pacbell.net (Nadine 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. If you are posting from AOL, please read RFC 1036 before posting again. -- Matthias Müller "Do not worship the copy." PC-9821Ap2 (NEC) / SunOS 4.1.4 From epark@berkeley.edu Fri Apr 21 05:06:58 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!epark From: epark@berkeley.edu (Élodie Park) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr21.050658.1822@berkeley.edu> Date: Fri, 21 Apr 1995 05:06:58 GMT References: <1995Apr18.215058.4877@pacbell.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr18.215058.4877@pacbell.net>, nduarte@pacbell.net (Nadine 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Élodie Park -- UC Berkeley Department of EECS "Hardware is temporary. The signal survives."