Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!mcvax!hp4nl!philmds!philce!joostv
From: joostv@philce.UUCP (Joost Vroonhoven)
Newsgroups: comp.sys.amiga
Subject: Re: Can you have to much Memory????
Summary: A2088 takes 512K address space, not 2M !
Keywords: A2000 A2088 A2058 expansion
Message-ID: <322@philce.UUCP>
Date: 14 Apr 89 08:25:22 GMT
References: <371@sagpd1.UUCP> <97840@sun.Eng.Sun.COM> <436@antares.UUCP>
Reply-To: joostv@philce.UUCP (Joost Vroonhoven)
Organization: Philips Consumer Electronics
Lines: 38

In article <436@antares.UUCP> jms@antares.UUCP (Joe Smith) writes:
>It's also mentioned in the installation instructions for the A2058 memory
>expansion board: "If you have the A2088 Bridgeboard installed, your A2058
>must be configured to 4MB or 2MB of memory in order for the Bridgeboard to
>run properly."
>
>I know the Bridgeboard maps the shared 128K of PC memory to 3 different
>address ranges on the 68000 side (for accessing bytes, words, and pixels), but
>I don't know why it takes such a big chunk out of the Amiga's address space.
>

Oh well. The A2058 doc indeed says the above but it 
means you cannot use all 8Megs as RAM when you have a Bridgecard installed.
 
Check the boards size in the ConfigDev structure of the expansion.library! 
The PC card takes 512K ADDRESS space from the expansion space. 
  
So you could use AT MOST 7.5 Meg of the expansion address space
as memory expansion. However the 2058 can 
only be configured as 2, 4 or 8Meg RAM.

If you got a card which could be configured in 512k steps up to 8 Meg then
there would be no problem.

I have written a little utility which looks at all expansion boards and gives
their address, size, product codes (anybody know these?) driver address etc.

Keep up the good work ! ............................  Joost.

+--------------------------------------------------------+
|          / // /                                        |
|         / // /      AMIGA  FEVER                       |
|   \ \\ / // /         catch it!        Joost           |
|    \ \/ // /                              van          |
|     \/ // /        Since only Amiga....     Vroonhoven |
+--------------------------------------------------------+
Philips Consumer Electronics  -  CIS-lab  -  CARIN project
joostv@philce.UUCP or ...mcvax!hp4nl!philmds!philce!joostv