8bitworkshop/src/docs/memprobe.md

Memory Probe

The Memory Probe is a heat map of memory activity. It is available on platforms that implement startProbing.

The canvas is a 256×256 grid of the 64K address space:

• X is the low byte of the address.
• Y is the high byte.
• The faint background shows a compressed view of current memory contents, so the map is still readable before anything executes.

Activity is drawn in color by operation type:

Color	Operation
Green	Execute
Red	Memory read
Blue	Memory write
Teal	I/O read
Magenta	I/O write
Yellow	DMA/VRAM read
Light blue	DMA/VRAM write
Bright green	Interrupt
White	Illegal / error
Pink	Wait

The view shows a complete frame, and might be incomplete during debugging.

Tooltips

Hovering the map shows the routines and operations that touched that address, including the program counter that performed each access and any associated value.