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| This page describes the format of the [[IR Services|ir:rst]]'s shared memory. It contains the current state of New 3DS input device, ie the c-stick and the ZL/ZR shoulder buttons.
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| Size: 0x88 ?
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| =Offset 0x0=
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| {| class="wikitable" border="1"
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| |-
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| ! Relative offset
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| ! Size
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| ! Description
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| |-
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| | 0x0
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| | 0x4
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| | A counter that ranges from 0 to 7, presumably to indicate which entry was last updated
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| |-
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| | 0x4
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| | 0x4
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| | Unused ? (value 0x0)
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| |-
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| | 0x8
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| | 0x80
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| | Array of 8 entries, where each entry (see below) is 0x10-bytes.
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| |}
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| IR module first updates index0, then index1, and so on. When updating the array when the index is already 7, the index is reset to 0.
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| ==PAD State==
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| {| class="wikitable" border="1"
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| |-
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| ! Bit
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| ! Description
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| |-
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| | 14
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| | ZL
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| |-
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| | 15
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| | ZR
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| |-
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| | 24
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| | C-stick right
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| |-
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| | 25
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| | C-stick left
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| |-
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| | 26
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| | C-stick up
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| |-
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| | 27
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| | C-stick down
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| |}
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| The ir:rst PAD entries are the same format as HID ones and meant to be ORd with them (they are complementary, there is no overlap in used bits).
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| ==Entry format==
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| {| class="wikitable" border="1"
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| |-
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| ! Relative offset
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| ! Size
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| ! Description
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| |-
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| | 0x0
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| | 0x4
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| | Current PAD state.
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| |-
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| | 0x4
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| | 0x4
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| | PAD state for buttons which were pressed(bitmasks which changed from value 0 to value 1) since the last HID update.
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| |-
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| | 0x8
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| | 0x4
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| | PAD state for buttons which were released(bitmasks which changed from value 1 to value 0) since the last HID update.
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| |-
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| | 0xC
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| | 0x4
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| | This stores c-stick info: the low s16 is the X coordinate, the high s16 is the Y coordinate. The c-stick center is exactly 0 for these fields. The range for these fields is approximately: -0x9C(bottom/left) - 0x9C(top/right).
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| |}
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