# MSX Memory Mapper 2

Upgrade of MSX memory mapper system;

* 144 bit page address
* 14 bit page size (TODO: octal is 12 or 15 bit)
* 18 bit width

So the MSX page size goes from 16KB to about 36KB per page.

Max addressable memory of a single mapper in yotta-bytes;

	((2^14)*18*(2^144))/8/1024/1024/1024/1024/1024/1024/1024/1024
	680020773533228910772224

Google thinks that up to 2025, global data creation is projected  
to grow to just a small 180 zettabytes, so having multiple copies all  
human data on a single memory controller should be OK for the nx-01.

![memmap2](images/msx4-memmapper.png "memmap2")