From eperez@hanse.de Tue Apr 04 23:38:04 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!eperez From: eperez@hanse.de (Élodie Pérez) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr04.233804.2021@hanse.de> Date: Tue, 04 Apr 1995 23:38:04 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Élodie Pérez *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From ltanaka@unam.mx Thu Apr 06 20:02:04 1995 Path: ashpoly!cascade!bigsur!unam!ltanaka From: ltanaka@unam.mx (Lars Tanaka) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr06.200204.3238@unam.mx> Date: Thu, 06 Apr 1995 20:02:04 GMT References: <1995Apr04.233804.2021@hanse.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Apr04.233804.2021@hanse.de>, eperez@hanse.de (Élodie Pérez) 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. Top-posters will be placed in my ~/.killfile without notice. -- Lars Tanaka -- Universidad Nacional Autónoma de México (DGSCA) "When every node is whole, the channel opens." From bhughes@u-tokyo.ac.jp Fri Apr 07 02:53:04 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!bhughes From: bhughes@u-tokyo.ac.jp (Bastien Hughes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr07.025304.6305@u-tokyo.ac.jp> Date: Fri, 07 Apr 1995 02:53:04 GMT References: <1995Apr04.233804.2021@hanse.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Apr04.233804.2021@hanse.de>, eperez@hanse.de (Élodie Pérez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Bastien Hughes Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From lcampbell@clari.net Fri Apr 07 11:49:04 1995 Path: ashpoly!cascade!mxgate!coyoacan!clari!lcampbell From: lcampbell@clari.net (Lucia Campbell) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr07.114904.7034@clari.net> Date: Fri, 07 Apr 1995 11:49:04 GMT References: <1995Apr04.233804.2021@hanse.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr04.233804.2021@hanse.de>, eperez@hanse.de (Élodie Pérez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Lucia Campbell US Robotics Courier V.34 @ 19,200 bps "5 sigma is a discovery. 7 is a question." From jkang@cam.ac.uk Sun Apr 09 13:09:04 1995 Path: ashpoly!cascade!brgate!saturno!cam!jkang From: jkang@cam.ac.uk (Julien Kang) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr09.130904.7813@cam.ac.uk> Date: Sun, 09 Apr 1995 13:09:04 GMT References: <1995Apr04.233804.2021@hanse.de> <1995Apr07.114904.7034@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Apr07.114904.7034@clari.net>, lcampbell@clari.net (Lucia Campbell) writes: > Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Julien Kang -- University of Cambridge Computer Laboratory "When every node is whole, the channel opens."