Extend ramdisk size above 4MB

[emesde]

There are now quite some possibilities to extend the ram size of an msx beyond the 4MB you can allocate now creating a ramdisk. Would it be possible to allocate more ? The ramdisk can already use more than one mapper . For example a use case for this is transfer files from one SD card to another.

Secondary question , do you know why the ramdisk is slower than reading from SD?