Xref: utzoo comp.sys.amiga:72490 comp.sys.amiga.hardware:4704 Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!apple!spies!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: <1990Nov24.223511.5632@zorch.SF-Bay.ORG> Date: 24 Nov 90 22:35:11 GMT References: <1990Nov23.020807.2951@coral.bucknell.edu> <594@cbmger.UUCP> Organization: SF-Bay Public-Access Unix Lines: 32 peterk@cbmger.UUCP (Peter Kittel GERMANY) writes: > hollnbgh@coral.bucknell.edu writes: >> I was under the impression that the "2-Meg" Agnus chip was >>exactly the same as the 1-meg Agnus chip currently shipping in the >>Amiga 500's, 2x00's, AND 3000's. I thoght the CHIP was the same, >>but that the 3000's socket connected the 21'st address line (that >>the 500's and 2x00's didn't connect to anything.) >No, it has been told a little different on the net: The silicon chip >inside Agnus is indeed identical in the 1-Meg and 2-Meg version, >BUT the inner bondings from the silicon to the outside pins differs, >so that in the 1-Meg version you have one address line not connected >to the contacts at the edge of the Agnus case. So if you don't want >to open that ceramic (or plastic) casing of Agnus and change the >bonding (with your 80 W soldering iron :-), you better change the >whole chip. 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? /// It's Amiga /// for me: why Kent, the man from xanth. \\\/// settle for \XX/ anything less? -- Convener, ongoing comp.sys.amiga grand reorganization.