Port Number: 003D-003E
Function: Memory Protection Range
- 003D (read-only)
- bit 0: This is set if the stack protector is written to.
- bit 1: This is set if protected memory or any port is written to.
- bits 2-7: Unknown
- 003E (write-only)
- Write a 1 to a bit to clear it in port 3D.