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(nasm.info)Section B.4.334

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B.4.334. `XLATB': Translate Byte in Lookup Table
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     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').