Xref: utzoo comp.sys.amiga:72521 comp.sys.amiga.hardware:4707 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker.mit.edu!apple!vsi1!zorch!xanthian From: xanthian@zorch.SF-Bay.ORG (Kent Paul Dolan) Newsgroups: comp.sys.amiga,comp.sys.amiga.hardware Subject: Re: Two megs of Chip RAM on an A2000 ?? Message-ID: <1990Nov25.053957.11764@zorch.SF-Bay.ORG> Date: 25 Nov 90 05:39:57 GMT References: <1990Nov24.223511.5632@zorch.SF-Bay.ORG> <1684@aldebaran.cs.nps.navy.mil> Organization: SF-Bay Public-Access Unix Lines: 48 schweige@cs.nps.navy.mil (Jeff Schweiger) writes: > xanthian@zorch.SF-Bay.ORG (Kent Paul Dolan) writes: >>OK, next question. My 2000 currently sports 9.5 meg of memory. With this >>daughterboard, which almost has to have a meg of memory _on_ it to >>access the chip bus, if I've followed previous discussions correctly, do >>I get to address 10.5 meg of autoconfiguring memory, 2 meg of it chip, >>or does one of my existing meg become unusable to make room in the >>address space for the other meg of chip ram? >According to Dean Brown of DKB Software (the makde of MegAChip 2000), it adds >an additional 1 Meg of autoconfig RAM. The board does come with the 1 Meg on >it. My question to you is how do you have 9.5 Meg of autoconfig memory at >present. I thought the present limit was 9 Meg. (I'll admit in advance that >I could quite possible be wrong in this). In any event, the flyer I have for >the MegAChip 2000 states that you can have a total of 10 Meg of RAM, 2 Meg of >Chip and 8 Meg of Fast RAM. Yep, I've lost the ability to do simple arithmetic in my head. Avail shows a total of 9,428,696 bytes of memory; a little is being eaten somewhere, but that is still smaller than the 9,437,184 bytes in 9 megabytes. My error; I thought a lot was being eaten (like perhaps all of workbench), giving a higher total, and I hadn't bothered to do the math. So, with this daughterboard setup, I could go from the half meg chip, half meg something (on chip bus but not chip?) on the mother board to two meg of chip, one on the motherboard, on on the daughterboard, plus the 8 meg of fast ram on the expansion card. Nice. I have _lots_ of use for more chip ram; gobs of screens, for starts. While I'm spinning dreams, there was once an indication that C= had given back 4 mbytes of address space for user memory that had been reserved for system use. 1) Is that true? 2) Has anyone ever built for sale a method of making a 12 mbyte A2000? 3) Is this daughterboard/motherboard memory already coming out of that 12 meg of address space, or is 14 meg an upper limit for installed ram? [Dream on.] Put another way, just how much usable ram could I have in an A2000 without going to a 68020 or 68030 processor, under today's rules, and does anyone actually sell the goodies to make it possible? /// It's Amiga /// for me: why Kent, the man from xanth. \\\/// settle for \XX/ anything less? -- Convener, ongoing comp.sys.amiga grand reorganization.