Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!oliveb!tymix!antares!jms
From: jms@antares.UUCP (Joe Smith)
Newsgroups: comp.sys.amiga
Subject: Re: Can you have to much Memory????
Summary: Bridgeboard uses up a lot of virtual address space
Message-ID: <436@antares.UUCP>
Date: 9 Apr 89 23:22:43 GMT
References: <371@sagpd1.UUCP> <97840@sun.Eng.Sun.COM>
Reply-To: jms@antares.UUCP (Joe Smith)
Organization: Tymnet QSATS, San Jose CA
Lines: 25

In article <97840@sun.Eng.Sun.COM> cmcmanis@sun.UUCP (Chuck McManis) writes:
>In article <371@sagpd1.UUCP> monty@sagpd1.UUCP (Monty Saine) writes:
>>                                           ... He also stated that he found
>>a comment in CBM's documentation that states something to the effect that
>>transformer will not operate correctly if the system contains more than 5Megs
>>of memory. What gives here? 
>
>Sheesh. In the *BRIDGECARD* installation notes there is a comment that you
>can't have more than 4Meg of Fast RAM. I believe this is fixed in the 2.0
>version of the Janus.library. 

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.

-- 
Joe Smith (408)922-6220 | jms@antares.Tymnet.COM or jms@tymix.Tymnet.COM
McDonnell Douglas FSCO  | UUCP: ...!{ames,pyramid}!oliveb!tymix!antares!jms
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San Jose, CA 95161-9019 | narrator.device: "I didn't say that, my Amiga did!"