A.5.334 XLATB: Translate Byte in Lookup Table
XLAT ; D7 [8086]
XLATB ; D7 [8086]
XLATB adds the value in AL, treated as an unsigned byte, to BX or EBX,
and loads the byte from the resulting address (in the segment specified
by DS) back into AL.
The base register used is BX if the address size is 16 bits, and EBX
if it is 32 bits. If you need to use an address size not equal to the
current BITS setting, you can use an explicit "a16" or "a32" prefix.
The segment register used to load from [BX+AL] or [EBX+AL] can be
overridden by using a segment register name as a prefix (for example,
ES XLATB).