From ssato@berkeley.edu Tue Jan 10 04:11:08 1995 Path: ashpoly!cascade!bigsur!berkeley!ssato From: ssato@berkeley.edu (Steve Sato) Newsgroups: comp.sys.m68k Subject: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan10.041108.4844@berkeley.edu> Date: Tue, 10 Jan 1995 04:11:08 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. 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? -- Steve Sato -- UC Berkeley Department of EECS "They will send a copy in my place." From bduarte@cmu.edu Wed Jan 11 07:21:08 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!bduarte From: bduarte@cmu.edu (Bruno Duarte) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan11.072108.5974@cmu.edu> Date: Wed, 11 Jan 1995 07:21:08 GMT References: <1995Jan10.041108.4844@berkeley.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan10.041108.4844@berkeley.edu>, ssato@berkeley.edu (Steve Sato) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Bruno Duarte *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From vfischer@cmu.edu Wed Jan 11 20:02:08 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!vfischer From: vfischer@cmu.edu (Valeria Fischer) Newsgroups: comp.sys.m68k Subject: Re: Question: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jan11.200208.7454@cmu.edu> Date: Wed, 11 Jan 1995 20:02:08 GMT References: <1995Jan10.041108.4844@berkeley.edu> <1995Jan11.072108.5974@cmu.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jan11.072108.5974@cmu.edu>, bduarte@cmu.edu (Bruno Duarte) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Valeria Fischer Tape trading list upon request. SASE required for international mail.