AND Variable bitwise operand | Variable1 = Variable1 AND Variable2
This command compares the individual bits of the value between two Variables, and produces a single binary output.
With AND, the resulting bit outputs are set to 1 (TRUE) only if both values' bit inputs are 1. This makes this a good way to disable a specific bit within a byte without changing the rest of the bits.
The bits available within a single byte are:
So, for example, if you want to edit a unit's Battle Stats to remove the Dead status (which is bit 0x20), but leave their other statii unchanged, you would UnitAddress their Unit ID, LoadAddress their stats at 0x0058 & 0x01BB into temporary variables (let's say 0x0070 & 0x0071), SET(x0072,x00DF), and then run ANDVar(x0070,x0072) and ANDVar(x0071,x0072), before using SaveAddress to put the corrected values back. Because the Dead status is in bit 0x20, a value of DF means that every bit except 0x20 is set to 1. As a result, the other statii in that byte will remain unchanged, but by forcing 0x20 to be set to 1 in the ImmediateValue, it will zero out the Dead bit in the final result.
Variable 1 : Half-Word (hex)
Variable 2 : Half-Word (hex)
Using ANDVar to force a variable to be a positive value
Set a variable to be your Whole Number Register. Let's say it's variable x0005. You need to set it to a value of x7FFF FFFF.
Let's say the number you want to force to be positive is x0070. ANDVar that against the Whole Number Register.