41CL MMU Backup

[grsbanks]

Here's an idea that could save some time when updating a 41CL.

When the updater sees that the YCRC of a modified page should be 0x53D36BD2, instead of transferring a page of 0xff can it not simply fill the target page with that value? Or better still, simply skip writing that page after erasing the sector because it'll already be full of 0xff.