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- CPU
-
- Sets or displays processor options.
-
- Format
-
- CPU [CACHE | NONCACHE] [BURST | NOBURST] [DATACAHCE | NODATACACHE] [DATABURST
- | NODATABURST] [INSTCACHE | NOINSTCACHE] [INSTBURST | NOINSTBURST] [FASTROM |
- NOFASTROM] [TRAP | NOTRAP] [COPYBACK | NOCOPYBACK] [EXTERNALCACHE |
- NOEXTERNALCACHE] [NOMMUTEST] [CHECK 68010 | 68020 | 68030 | 68040 | 68881 |
- 68882 | 68851 | MMU | FPU]
-
- Template
-
- CACHES/S,BURST/S,NOCACHE/S,NOBURST/",DATACACHE/S,NODATACHE/S,DATABURST/S,NODA
- TABURST/S,INSTCACHE/S,NOINSTCACHE/S,INSTBURST/S,NOINSTBURST/S,COPYBACK/S,NOCO
- PYBACK/S,EXTERNALCACHE/S,NOEXTERNALCACHE/S,FASTROM/S,NOFASTROM/S,TRAP/S,NOTRA
- P/S,NOMMUTEST/S,CHECK/K
-
- Location
-
- C:
-
- CPU adjusts various options of the microprocessor installed in your Amiga.
- CPU also shows 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
- and 68040 have two types of cache memory: instruction and data.
-
- If mutually exclusive options are specified, the safest option is used.
- Availability of the following options depends on the type of microprocessor
- present.
-
- 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.
-
- NOINSTCACHE
-
- Turns off instruction cache.
-
- INSTBURST
-
- Turns on burst mode for instructions.
-
- NOINSTBURST
-
- Turns off burst mode for instructions.
-
- FASTROM
-
- With a processor having a supported MMU, copies the system ROM into 32-bit
- RAM, making access to operating system functions significantly faster. CPU
- then write-protects the RAM area so that the data cannot be changed.
-
- NOFASTROM
-
- Turns off FASTROM.
-
- TRAP
-
- This option is for developers only.
-
- NOTRAP
-
- This option is for developers only.
-
- COPYBACK
-
- Turns on 68040 copyback cache.
-
- NOCOPYBACK
-
- Turns off 68040 copyback cache.
-
- EXTERNALCACHE
-
- Turns on external cache.
-
- NOEXTERNALCACHE
-
- Turns off external cache.
-
- NOMMUTEST
-
- Allows the MMU settings to be changed without checking to see if an MMU is
- currently in use.
-
- The CHECK option, when given with a keyword (68010, 68020, 68030, 68040,
- 68881, 68882, or 68851, MMU, FPU) checks for the presence of the processor
- indicated by 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)
-
-