Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!elroy.jpl.nasa.gov!lll-winken!uunet!cbmvax!daveh From: daveh@cbmvax.commodore.com (Dave Haynie) Newsgroups: comp.sys.amiga.advocacy Subject: Re: MegaMac Message-ID: <22231@cbmvax.commodore.com> Date: 7 Jun 91 00:42:26 GMT References: <55538@nigel.ee.udel.edu> <91157.001511MBS110@psuvm.psu.edu> <16719@darkstar.ucsc.edu> Reply-To: daveh@cbmvax.commodore.com (Dave Haynie) Organization: Commodore, West Chester, PA Lines: 46 In article <16719@darkstar.ucsc.edu> galpin@ucscb.UCSC.EDU (Dan Galpin (Amiga-quester)) writes: >In article <91157.001511MBS110@psuvm.psu.edu> MBS110@psuvm.psu.edu (Norman St. John Polevaulter) writes: >>>"Dan Galpin (Amiga-quester" writes: >>>[Tangent Deleted] >>The Amiga 3000 can be expanded to 2 Gigs (that's 2000 Megs) of RAM. >>Next question. >And it also can have 32 bit graphics cards. I don't see them yet. I vaguely >remember Dave Haynie talking about a realistic max of 64 MBytes/Zorro III slot. And there is the Super-fast RAM CPU slot. OK. The A3000 has a few chunks of memory space reserved for expansion. The Coprocessor slot can support up to 128MB of something (presumably memory) at full 68030 speeds. Practically speaking, a Coprocessor slot card has enough room on it to get 128MB, but not with a 68040 there too. Chances are, this slot get used for processor upgrades. The Zorro III bus has 1.75 GB ($10000000-$7fffffff) reserved for it in the A3000 memory map. The autoconfiguration mechanism support units as large as 1GB each (you can have one of these). In any case, using 4MBit ZIP DRAMs, you can realistically fit 64MB on a board. If you went to 16MBit DRAMs, like used on those 16MB Mac SIMMs, you could fit 256MB per card. Those chips do in fact exist, though they're considerably more expensive per MB than 4MBit parts. >This mythical board does not exist. The only one I have heard of is the >prototype done by Dave.. Actually, an example board. For last year's Atlanta DevCon, I did an example 32 MB board. I certainly could have made it 64MB, but I wanted to keep the design simple enough to act as a viable learning tool. Anyone could of course clone this design and build a 32 or 64 MB board of their own, but that's not the same thing as being able to run down to the bank, mortgage your house, run to the computer store, and buy a couple hundred megabytes. >Until a product comes out (and I am sure that it will..) all the A3000 owners >are pretty much limited to 18 Megs. >(Is it possible to put a ZORRO II (**slow**) card in and get another 8 megs?) Yeah, you can add another 8 MB of 16 bit RAM, and yeah, it will be slow. -- Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests" {uunet|pyramid|rutgers}!cbmvax!daveh PLINK: hazy BIX: hazy "This is my mistake. Let me make it good." -R.E.M.