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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [hatari-devel] ROMSPEED effect?
- From: Uwe Seimet <Uwe.Seimet@xxxxxxxxx>
- Date: Thu, 13 Aug 2015 07:11:42 +0200
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Hi,
> MMU cannot be enabled with TT-RAM, so I'm not
> sure whether ROMSPEED actually did anything.
Provided that you were using the current version 3.11 of ROMSPEED, you
can find the sources in the ROMSPEED archive. There is not really much
PMMU-related code except for the modification of the descriptor relevant
for the mapping of the ROM contents (this is what _sysbase points to):
move.l rombuf,d0 ;new "ROM" address
or #5,d0 ;write protect
move.l _sysbase,a0
ptestr #2,([8,a0]),#7,a0
move.l d0,(a0) ;update descriptor in the existing table
pflusha
If there is no (working) PMMU support I would expect nothing visible to
happen, indeed. Except for having less RAM because the ROM contents have
been copied.
Take care
Uwe