>> 1. How do I tell if I have a PMMU installed, or not.
>
>I think there are utilities which tell you your system configuration
>in detail, but I don't even know the names.  I'll let other people
>answer this.  However, as far as I can tell from the boot message,
>your Mac II doesn't seem to have one.

The apple mmu is a funny looking black thing (small die in a big header)
The real PMMU looks a lot like the 68020. You will have no trouble telling
them apart.
>
>> 2. How do I get a M68851 if I don't have one installed. I have heard they
>> are scarce...

They are available, they may cost you between 50 and 100 bux
>
>I know there is at least one place who carries the chip for about $90.
>I found their ad in Macworld.

That's not cheap,
>
>Alternatively, you can get the same functionality by installing a
>68030 accelerator in your Mac II since 68030 has a built-in PMMU with
>which NetBSD/mac68k works just fine.  I'm running NetBSD/mac68k on an
>SE/30 beefed up (a bit ;-) by DayStar PowerCache (68030+68882@40MHz)
>with the secondary cache disabled (NetBSD doesn't boot with the
>secondary cache enabled), so I don't think you should have any problem
>with a 33-40MHz 68030 accelerator with no secondary cache on a Mac II.
>
This is what I do also. The daystar PowerCache's are expensive though. I
paid 200 in a closeout deal at computer city, and then had to buy the
adaptor from daystar for another $100. I am not sorry, it is much faster,
and running MacOS is also faster, especially with the cache on. I think
someone is working on getting the cache to work with netbsd. That will be
very nice if it happens.

Brad


Stephen B. "Brad" Salai                       bsalai@cyber1.servtech.com
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