Différences

Ci-dessous, les différences entre deux révisions de la page.

--- back2root:ibm-pc-ms-dos:instr:xlat-xlatb [2023/03/04 13:25] – [Tableau] frater
+++ back2root:ibm-pc-ms-dos:instr:xlat-xlatb [2023/03/04 13:26] (Version actuelle) – frater
@@ Ligne 3: / Ligne 3: @@
 ===== XLAT/XLATB - Translate =====
-Replaces the byte in AL with byte from a user table addressed by BX.
+Replaces the byte in AL with byte from a user table addressed by BX. The original value of AL is the index into the translate table.
-The original value of AL is the index into the translate table.
+Locates a byte entry in a table in memory, using the contents of the AL register as a table index, then copies the contents of the table entry back into the AL register.
+The index in the AL register is treated as an unsigned integer. The XLAT and XLATB instructions get the base address of the table in memory from either the DS:EBX or the DS:BX registers (depending on the address-size attribute of the instruction, 32 or 16, respectively).
 **Usage:**
@@ Ligne 22: / Ligne 24: @@
 ^  Operands  ^  808x    ^  286  ^  386  ^  486  ^  Bytes  ^   ^
 | table      |  11      |  5    |  5    |  4    |  1      |   |
+This instruction replace the following code:
+<code asm>
+	XOR	AH,AH
+	ADD	BX,AX
+	MOV	AL,BYTE PTR DS:[BX]
+</code>
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