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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: <1990Nov30.172718.21707@agora.uucp>
Date: 30 Nov 90 17:27:18 GMT
References: <594@cbmger.UUCP> <1990Nov24.223511.5632@zorch.SF-Bay.ORG> <1990Nov30.171201.21397@agora.uucp>
Organization: Open Communications Forum
Lines: 32

In article <1990Nov30.171201.21397@agora.uucp> billsey@agora.uucp (Bill Seymour) writes:
: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...)
	Woops! I fell into your trap there... :-) subtract a meg from all my
total memory numbers. You only have nine megs possible right now, this will
expand you to either 10 or 11 megs...
:	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...


-- 
     -Bill Seymour                                            billsey@agora
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