For reset condition, If we go with A0, 2-byte instructions like ORA zpg,X are fine, as I'll know whether Im in first byte or second byte of that instruction when I need to start injecting, but originally I thought about an operand in the 4K space, that didnt take a second byte, so I could feed it repeatedly, and interject immediately at any point. Something like: Clear Carry Flag (hex 18) which is always a single byte.   The reason I reason I thought Id want A11 though, is to detect rese