Controller port registers

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NES

Addr 7654.3210 Function
$4016 (W) ----.---A Output data (strobe) to both controllers.
----.-CBA Output data to the expansion port.
$4016 (R) ---4.3--0 Read data from controller port #1.
---4.3210 Read data from expansion port.
$4017 (R) ---4.3--0 Read data from controller port #2.
---4.3210 Read data from expansion port.

Famicom

Addr 7654.3210 Function
$4016 (W) ----.---A Output strobe to both controllers.
----.-CBA Output data to the expansion port.
$4016 (R) ----.-M-0 Read data from controller #1 and microphone state from controller #2
----.--1- Read data from expansion port.
$4017 (R) ----.---0 Read data from controller #2.
---4.3210 Read data from expansion port.