From ysato@clari.net Mon Oct 02 17:33:50 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!ysato From: ysato@clari.net (Yuki Sato) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct02.173350.6488@clari.net> Date: Mon, 02 Oct 1995 17:33:50 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Yuki Sato | ysato@clari.net PGP Key fingerprint: 7215 BB45 6B42 8F1C "Keep the channels open." From gsmirnov@clari.net Tue Oct 03 06:01:50 1995 Path: ashpoly!cascade!bigsur!clari!gsmirnov From: gsmirnov@clari.net (Graham Smirnov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct03.060150.4824@clari.net> Date: Tue, 03 Oct 1995 06:01:50 GMT References: <1995Oct02.173350.6488@clari.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct02.173350.6488@clari.net>, ysato@clari.net (Yuki Sato) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Graham Smirnov Hayes Optima 288 @ 33,600 bps "We don't sign stars. We build them." From mlopez@earthlink.net Wed Oct 04 12:36:50 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!mlopez From: mlopez@earthlink.net (Mike López) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct04.123650.2346@earthlink.net> Date: Wed, 04 Oct 1995 12:36:50 GMT References: <1995Oct02.173350.6488@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct02.173350.6488@clari.net>, ysato@clari.net (Yuki Sato) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Mike López | mlopez@earthlink.net PGP Key fingerprint: DD05 80E9 7F09 D445 "Keep the channels open."