#139 Debug Monitor shows inconsistent RAM contents compared to actual memory (SMON verification)

[ClausS]

I found an inconsistency between the Debug Monitor memory view and the actual C64 memory contents.
When writing a continuous memory block using a monitor tool (SMON), the data is correctly written and can be verified within SMON itself. However, the Debug Monitor shows incorrect or inconsistent data in the same memory range.

Steps to Reproduce

1.  Start Denise
2.  Launch a machine code monitor (e.g. SMON)
3.  Fill a memory range, for example:

o 2000 4000 cc
4. Verify the memory inside SMON:
• The entire range is correctly filled with $CC
5. Open the Debug Monitor memory view
6. Inspect the same memory range ($2000–$3FFF)

Observed Behavior
• The Debug Monitor initially shows correct values ($CC)
• After a certain point (e.g. around $2200), the data becomes inconsistent
• Some regions show unexpected values
• Further ahead, correct $CC values appear again
• The incorrect regions appear in blocks, not randomly

Expected Behavior
• The Debug Monitor should display a continuous block of $CC values across the entire range ($2000–$3FFF), matching the actual RAM contents.

Notes
• The issue only affects the Debug Monitor display
• The actual memory contents are correct (verified via SMON)
• This suggests a problem in the Debug Monitor memory source or address mapping

Environment
• Denise version: 2.7 (nightly)
• Platform: macOS (Apple Silicon)

[ClausS]

Created by mistake, please ignore.