Xref: utzoo comp.sys.amiga:73186 comp.sys.amiga.hardware:4869 Path: utzoo!attcan!uunet!kddlab!trl!rdmei!ptimtc!olivea!apple!usc!sdd.hp.com!think.com!mintaka!ogicse!intelhf!agora!billsey From: billsey@agora.uucp (Bill Seymour) Newsgroups: comp.sys.amiga,comp.sys.amiga.hardware Subject: Re: Two megs of Chip RAM on an A2000 ?? Message-ID: <1990Nov30.171201.21397@agora.uucp> Date: 30 Nov 90 17:12:01 GMT References: <1990Nov23.020807.2951@coral.bucknell.edu> <594@cbmger.UUCP> <1990Nov24.223511.5632@zorch.SF-Bay.ORG> Organization: Open Communications Forum Lines: 34 In article <1990Nov24.223511.5632@zorch.SF-Bay.ORG> 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? Well, I haven't seen the daughterboard, but there are two possibilities as I see it... They either have one meg of ram on their board, mapped to $100000-$1FFFFF or they have two meg onboard, mapped to $000000-$1FFFFF. If they have two meg onboard, it's possible they will remap the motherboard memory to $C00000-$CFFFFF. First case allows to expand your 2000 to 11 megs, up one meg from the 10 megs supported now (Note, that's not 9.5...) Second case, part one, alos allows you to expand to 11megs. Second case, part two, allows you to expnad to a full 12megs. That is very close to the maximum you could take a 2000 without a coprocessor card. (You could actually hack up some memory into the 512K below the ROM, I believe. And possibly to the 512K at $D00000... : /// It's Amiga : /// for me: why :Kent, the man from xanth. \\\/// settle for : \XX/ anything less? :-- :Convener, ongoing comp.sys.amiga grand reorganization. -- -Bill Seymour billsey@agora ***** American People/Link Amiga Zone Hardware Specialist NES*BILL ***** Bejed, Inc. NES, Inc. Northwest Amiga Group At Home Sometimes (503) 281-8153 (503) 246-9311 (503) 656-7393 BBS (503) 640-0842