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| === NES ===
| | #REDIRECT [[Controller reading]] |
| {| border=1
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| ! Addr || <tt>7654.3210</tt> || Function
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| |-
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| |rowspan=2| $4016 (W) || <tt>----.---A</tt> || Output data (strobe) to both controllers.
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| |-
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| | <tt>----.-CBA</tt> || Output data to the expansion port.
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| |-
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| |rowspan=2| $4016 (R) || <tt>---4.3--0</tt> || Read data from controller port #1.
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| |-
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| | <tt>---4.3210</tt> || Read data from expansion port.
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| |-
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| |rowspan=2| $4017 (R) || <tt>---4.3--0</tt> || Read data from controller port #2.
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| |-
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| | <tt>---4.3210</tt> || Read data from expansion port.
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| |}
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| | |
| === Famicom ===
| |
| {| border=1
| |
| ! Addr || <tt>7654.3210</tt> || Function
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| |-
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| |rowspan=2| $4016 (W) || <tt>----.---A</tt> || Output strobe to both controllers.
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| |-
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| | <tt>----.-CBA</tt> || Output data to the expansion port.
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| |-
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| |rowspan=2| $4016 (R) || <tt>----.-M-0</tt> || Read data from controller #1 and microphone state from controller #2
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| |-
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| | <tt>----.--1-</tt> || Read data from expansion port.
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| |-
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| |rowspan=2| $4017 (R) || <tt>----.---0</tt> || Read data from controller #2.
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| |-
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| | <tt>---4.3210</tt> || Read data from expansion port.
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| |}
| |
