The "Debug Memory" view shows the current view the CPU has on RAM/ROM.
Values that changed during the last step are marked red.
Clicking on the display-as-text button (left most) will switch to character display. Clicking again switches to lower case mode.
Clicking on the display-as-charset button (second left) will switch to characterset display. Clicking again switches between hires, multicolor and ECM mode. The used colors can be changed via right-click context menu.
Clicking on the display-as-sprite button (third) will switch to sprite display. Clicking again switches between hires and multicolor mode. The used colors can be changed via right-click context menu.