Amiga 3000

amicrawler · 15 September 2009, 06:16

I have a Amiga 3000 is there a way to turn on the mmu it said it is off
and to turn on the cpu data cache on it is all so off
or is this not needed i have 2MB chip ram and 4MB fast ram no cards installed and a 2GB 7200rpm drive in it and kick 3.1 and wb 3.1

alexh · 15 September 2009, 09:28

MMU is always off unless a program or the OS is using it.

CPU caches should be on by default but if not, just open a CLI window and use the CPU command.

Code:

CPU
Format:  CPU CACHE/S BURST/S NOCACHE/S NOBURST/S DATACACHE/S DATABURST/S
         NODATACACHE/S NODATABURST/S INSTCACHE/S INSTBURST/S NOINSTCACHE/S
         NOINSTBURST/S COPYBACK/S NOCOPYBACK/S EXTERNALCACHE/S 
         NOEXTERNALCACHE/S FASTROM/S NOFASTROM/S NOMMUTEST/S CHECK/K
Purpose: Change or display CPU settings e.g. caches, burst, fastrom
Example: CPU INSTCACHE FASTROM

CLI> CPU CACHE BURST FASTROM

Should enable all caches, burst mode and copy the ROM into FASTRAM and use the MMU. You can put this in your startup-sequence if you want it to be like this all the time.

LocalH · 15 September 2009, 23:06

Beware that remapping Kickstart into RAM like this will eat 512KB of memory (which may be needed depending on the programs that will be used).

Doesn't SetPatch ensure that the caches are on anyway? They might not be if you boot without startup-sequence (I forget whether the data cache is on by default or not, but I'm pretty sure the instruction cache is on by default). I don't think either burst mode is on by default, though.

15 September 2009, 06:16	#1
amicrawler Registered User Join Date: Mar 2009 Location: some where in the world Posts: 50	Amiga 3000 I have a Amiga 3000 is there a way to turn on the mmu it said it is off and to turn on the cpu data cache on it is all so off or is this not needed i have 2MB chip ram and 4MB fast ram no cards installed and a 2GB 7200rpm drive in it and kick 3.1 and wb 3.1

15 September 2009, 09:28	#2
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,330	MMU is always off unless a program or the OS is using it. CPU caches should be on by default but if not, just open a CLI window and use the CPU command. Code: CPU Format: CPU CACHE/S BURST/S NOCACHE/S NOBURST/S DATACACHE/S DATABURST/S NODATACACHE/S NODATABURST/S INSTCACHE/S INSTBURST/S NOINSTCACHE/S NOINSTBURST/S COPYBACK/S NOCOPYBACK/S EXTERNALCACHE/S NOEXTERNALCACHE/S FASTROM/S NOFASTROM/S NOMMUTEST/S CHECK/K Purpose: Change or display CPU settings e.g. caches, burst, fastrom Example: CPU INSTCACHE FASTROM CLI> CPU CACHE BURST FASTROM Should enable all caches, burst mode and copy the ROM into FASTRAM and use the MMU. You can put this in your startup-sequence if you want it to be like this all the time.

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15 September 2009, 23:06	#3
LocalH Amiga user since 1990 Join Date: Aug 2004 Location: Kingsport, TN / USA Age: 44 Posts: 295	Beware that remapping Kickstart into RAM like this will eat 512KB of memory (which may be needed depending on the programs that will be used). Doesn't SetPatch ensure that the caches are on anyway? They might not be if you boot without startup-sequence (I forget whether the data cache is on by default or not, but I'm pretty sure the instruction cache is on by default). I don't think either burst mode is on by default, though.

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