On Thu, 21 Dec 1995, Chris Mason wrote:

> Also, there is a ROM call to switch MMU modes.   Have a peek in IM V -- OS
> Utils:
> 
> PROCEDURE SwapMMUMode (VAR Mode:  Byte);
> CONST false32b = 0; {24 bit}
>       true32b = 1; {32 bit}
> 
> Will that solve the mapping problem??

I noticed that a couple of days ago in a FutureBASIC manual but couldn't 
find a way to crossreference it with anything outside of FB.  My 
Encyclopedia Mac Rom says it is Only for 256K ROM systems, but I don't 
think NetBSD will run on anything before the SE, anyway.  It also says 
the instruction was included for A/UX support.  Sounds pretty promising.  
I'm almost sure I've found out how to check the current setting.  From 
"new low mem": Location $0CB2 -- boolean reflecting current machine MMU 
mode.  Also, MMUFlutt, $0CB3 -- byte forced by reducing MMUMode to 
MMU32bit might be usefull, though I'm not quite sure how.

Later,

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