[AmigaOS / ApolloOS Command Reference\CPU] 
 
 
 CPU
 
  
 Format:	CPU [CACHE] [NOCACHE] [BURST] [NOBURST] [DATACACHE] 
 		[DATABURST] [NODATACACHE] [NODATABURST] [INSTCACHE] 
 		[INSTBURST] [NOINSTCACHE] [NOINSTBURST) [FASTROM] 
 		[NOFASTROM] [NOMMUTEST]	[CHECK 68010|68020|68030|68040| 
 		68881|68882|68851|MMU|FPU] [TRAP] [NOTRAP] [COPYBACK] 
 		[NOCOPYBACK] [EXTERNALCACHE] [NOEXTERNALCACHE] 
  
 Template:	CACHE/S, BURST/S, NOCACHE/S, NOBURST/S, DATACACHE/S, 
 		DATABURST/S, NODATACACHE/S, NODATABURST/S, INSTCACHE/S, 
 		INSTBURST/S, NOINSTCACHE/S, NOINSTBURST/S, COPYBACWS, 
 		NOCOPYBACK/S, EXTERNALCACHE/S, NOEXTERNALCACHE/S, FASTROM/S, 
 		NOFASTROM,S, TRAP/S, NOTRAP/S, NOMMUTEST/S, CHECK/K 
  
 Purpose:	To set or clear the CPU caches, check for a particular 
 		processor, load the ROM image into fast, 32-bit memory, or 
 		set an illegal memory access handler which will output 
 		information over the serial port at 9600 baud if a task 
 		accesses page zero (lower 256 bytes) or memory above 16M on 
 		a 68000 Amiga. 
  
 Path:		C:CPU 
  
 Specification: 
  
 CPU allows you to adjust various options of the microprocessor installed in 
 your Amiga. CPU will also show the processor and options that are currently 
 enabled. 
  
 Many options only work with certain members of the 680X0 processor family. 
 The 68020 has a special type of memory known as instruction cache. When 
 instruction cache is used, instructions are executed more quickly. The 68030 
 has two types of cache memory: instruction and data. The CPU options, 
 outlined below, specify the types of memory to be used. If mutually 
 exclusive options are specified, the safest option is used. 
  
 Availability of the options listed below depends on availability of required 
 hardware. 
 
 
 CACHE
		Turns on all caches. 
 
 
 NOCACHE
		Turns off all caches. 
 
 
 BURST
		Turns on burst mode for both data and instructions. 
 
 
 NOBURST
		Turns off burst mode for data and instructions. 
 
 
 DATACACHE
	Turns on data cache. 
 
 
 NODATACACHE
	Turns off data cache. 
 
 
 DATABURST
	Turns on burst mode for data. 
 
 
 NODATABURST
	Turns off burst mode for data. 
 
 
 INSTCACHE
	Turns on instruction cache. 
 
 
 INSTBURST
	Turns on burst mode for instruction. 
 
 
 NOINSTCACHE
	Turns off instruction cache. 
 
 
 NOINSTBURST
	Turns off burst mode for instructions. 
 
 
 FASTROM
		If supported by the MMU, copies data from ROM into 32-bit 
 		RAM, making access to this data significantly faster. CPU 
 		then writeprotects the RAM area so that the data cannot be 
 		changed. 
 
 
 NOFASTROM
	Turns off FASTROM. 
 
 
 NOMMUTEST
	Allows the MMU settings to be changed without checking to 
 		see if MMU is currently in use. 
 
 
 TRAP
		Developer-specific. 
 
 
 NOTRAP
		Developer-specific. 
 
 
 COPYBACK
	Turns on cache copyback. 
 
 
 NOCOPYBACK
	Turns off cache copyback. 
 
 
 EXTERNALCACHE
	Turns on external cache. 
 
 
 NOEXTERNALCACHE
	Turns off external cache. 
  
 The CHECK option, when given with a keyword (68010, 68020, 68030, 68040, 
 68881, 68882, or 68851, MMU, FPU) checks for the presence of the keyword. 
  
 Examples: 
  
 1> CPU 
 System: 68030 68881 (INST: Cache Burst) (DATA: Cache NoBurst) 
  
 1> CPU NoDataCache FastROM 
 System: 68030 68881 FastROM (INST: Cache Burst) DATA: NoCache NoBurst) 
  
 1> CPU NoBurst DataCache NoInstCache 
 System: 68030 68881 (INST: NoCache NoBurst) (DATA: Cache NoBurst)