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Direct Page Flag
From SnesLab
The Direct Page Flag (P) is bit 5 of the S-SMP's program status word:
- When clear, the direct page is the zeropage (located at 0000h to 00FFh).
- When set, the direct page is page one (located at 0100h to 01FFh).
The direct page flag is set by SETP and cleared by CLRP.
Reference
- Appendix C-2 of Book I of the official Super Nintendo development manual