From DoomWiki.org

A_Lower is a code pointer used in the weapon lower animation for all weapons.

A_Lower moves the Y position of the weapon sprite towards the bottom of the screen by a small amount each time it is invoked. If the bottom of the screen is reached, the next weapon is selected and the raise state is invoked to bring it up. A_Lower is usually used in a state that is an infinite loop that repeatedly jumps back to itself; the loop terminates when the weapon has finished lowering.


The A_Lower code pointer appears in the following states in Doom's state table:


The following is an example of how to set the A_Lower code pointer in a Dehacked file:

Pointer 21 (Frame 34)
Codep Frame = 82

Or using BEX syntax:

Frame 1234 = Lower

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