41CL MMU Backup

[Monte Dalrymple]

(06-01-2020 09:24 PM)twoweims Wrote:  Are the "not visible OS" areas in Page 800 (Register 200, 2F0-300, and 3F0-3FF) used for? Are they completely unused or is the Nut processor using them for something that is just not visible to the 41 OS?

As in the original HP41, these locations are not readable. The bus stays 3-state for these addresses.

The RAM corresponding to those register addresses is accessible using the NEWT WCMD however (I think, not sure I ever tried it.)