From the UC-41 page:
"In version 1E, swtching between HEPAX RAM blocks in the NoV-32 or the NoV-64 became really easy. I added the functions N100, N101, N102 and N103 to switch directly to the desired ram block. "
The updated 10 page user manual will give you the insides.
WROM is still there for generic write-to-hepax-ram. But now you don't need any FOCAL program to code/decode address/word for switching ram pages on the NoV-32 and NoV-64. You can very easily switch the ram blocks - even inside a program.
Someone wants to write a 64K chess program for the HP-41?
Edited: 17 June 2009, 11:08 a.m.