Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!columbia!rutgers!caip!cbmvax!daveh From: daveh@cbmvax.cbm.UUCP (Dave Haynie) Newsgroups: net.micro.amiga Subject: Re: Re: CSA Turbo Amiga Message-ID: <856@cbmvax.cbmvax.cbm.UUCP> Date: Wed, 8-Oct-86 14:09:19 EDT Article-I.D.: cbmvax.856 Posted: Wed Oct 8 14:09:19 1986 Date-Received: Thu, 9-Oct-86 05:36:49 EDT References: <850@cbmvax.cbmvax.cbm.UUCP> Organization: Commodore Technology, West Chester, PA Lines: 43 > > Glad you'll answer questions! I'm somewhat confused about how the CSA > board works. I assume the 68020 doesn't plug in where the 68000 does, > so does the Amiga's own 68K just act as the graphics engine, and Exec > runs through the 68020?!? I guess I mean, how does the 68020 "take > over" the machine, and yet everything still works, and is, I presume > still compatible? > > Confused, > Paul. > > Disclaimer: I do not work for Commodore and my opinions are my own. > Hi Higgy, long time no see... As for the CSA board, you might well ask WHICH CSA board. The original Amiga "Turbo" board was descended from CSA's original 68020 board, which was a plug-in replacement for the 68000. It was designed as a quick upgrade for 68000 systems, and to let you develop '020 code on an '000 based machine. The 68020 board has a 14.2MHz clock and the option of a 68881 math cruncher and about a meg (as I recall) of memory that the '020 can read/write at full speed, i.e. 14.2MHz with a 32 bit bus, or a hardware speedup alone of 4 times. The '020's bus is of course sized to 16 bits for talking to the normal Amiga busses, and it has to talk to this memory at normal Amiga speeds. After their (I assume) success with this (I'd kill for one), they built an external expansion box sporting not only the standard Amiga 100pin slots, but an extra connector (ala PC-AT) for the rest of the 68020's address and data lines. And they now (last I heard from them) sell a 68020 card for that box, fast 32 bit memory for that box, etc., and have phased out the internal Amiga-specific plug-in. I've heard that they keep the Amiga's normal 68000 turned off most if not all the of time, though I like the idea of using both of them (care to hack the Amiga OS into supporting this, though?). -- ============================================================================ Dave Haynie {caip,ihnp4,allegra,seismo}!cbmvax!daveh "Techno-Hippie, heathen, designing evil computers" These opinions are my own, though if you try them out, and decide that you really like them, a small donation would be appreciated.