Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!unisoft!mtxinu!taniwha!paul
From: paul@taniwha.UUCP (Paul Campbell)
Newsgroups: comp.sys.mac
Subject: Re: 68851 PMMU Test?
Message-ID: <383@taniwha.UUCP>
Date: 21 Jun 89 06:58:57 GMT
References: <134@nisca.ircc.ohio-state.edu>
Reply-To: paul@taniwha.UUCP (Paul Campbell)
Distribution: comp.sys.mac
Organization: Taniwha Systems Design, Oakland
Lines: 21

In article <134@nisca.ircc.ohio-state.edu> bobd@hpuxa.ircc.ohio-state.edu (Bob DeBula) writes:
>Well, I got my 68851 PMMU installed in my MAC-II, now (without buying
>Virtual or A/UX) does anyone know how to test it?  I'm planning on waiting
>until System 7.0 to actually exploit it, but I would like to assure myself
>that it's properly installed and functioning. Any ideas netters?  

actually a very simple (and quite good) test is to plug in the PMMU and
turn the Mac on. If you get a happy Mac the the PMMU is OK (they actually
have to use the PMMU to map to the crazy 24-bit addressing ....). Of
course this does not test all the internal functions of the PMMU but
at least you know the TLB works and that it walks page tables etc

	Paul



-- 
Paul Campbell, Taniwha Systems Design	UUCP:		..!mtxinu!taniwha!paul 
Oakland CA				AppleLink:	D3213
Q: How many men does it take to pilot the Exxon Valdez?
A: One and a fifth.