Amiga cpu 020 vs 030

[mongo]

Better software compatibility with the 020 chip.  Dose not have a built-in MMU, like the 030 chip.  The 020 chip uses an external MMU chip that can be turned off for better software compatibility.  68020 boards are usually made better then 68030 boards.

The MMU in an 030 is generally not used and is off by default. It doesn't affect compatibility in any way. The only things that might affect compatibility are the data cache, which can be disabled, and the missing CALLM and RTM instructions, which were very rarely, if ever used.

[Dr.Bongo]

i have never taking it apart

Maybe you should do so very soon and check the clock battery for leakage!

[AAACHIPSET]

is there any software that uses the  mmu ?? i dont think workbench any version does ..maybe  os4 an above ..but any other software?

[spirantho]

Yes, various pieces of software can use it, but they usually don't need it.
The usual use is for softkicking other Kickstarts into RAM. Most programs use mmulib on Aminet I think.

[Effy]

Doesn't a mmu allow you to use a part of the harddrive as Ram

[creid2]

How do you disable the cache? I have a G-force 030 combo and having some issues with hardware compatibility.

C

The MMU in an 030 is generally not used and is off by default. It doesn't affect compatibility in any way. The only things that might affect compatibility are the data cache, which can be disabled, and the missing CALLM and RTM instructions, which were very rarely, if ever used.

[zipper]

cpu nocache