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xlat x86
xlat program in 8086
what is xlat
lookup table in microprocessor 8086
xlat masm
xlat instruction in assembly language
xlat full form
xlat meaning
Description. 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
You then load AL with the position of the byte you want in the table and invoke the XLAT instruction. The byte stored at the specified position in the table will be in AL register after the instruction executes. In other words, the instruction does the equivalent of the following: AL <--- [AL+BX] EXAMPLE: A TABLE OF ASCII
Example : For the data given, what is the result of executing the instruction. XCHG [SUM], BX. Data Transfer Instructions 8086. XLAT (translate):. This instruction is useful for translating characters from one code such as ASCII to another such as EBCDIC, this is no operand instruction and is called an instruction with implied
The operand to XLAT allows for the possibility of a segment override. XLAT uses the contents of BX even if they differ from the offset of the operand. The offset of the operand should have been moved intoBX/EBX with a previous instruction. The no-operand form, XLATB, can be used if the BX/EBX table will always reside in
21 Dec 2015 XLAT : Translate byte using look-up table Eg. LEA BX, TABLE1 MOV AL, 04H XLAT Simple input and output port transfer Instructions: IN: Copy a byte or .. Example : Write an instruction sequence to save the contents of the 8086's flags in memory location MEM1 and then reload the flags with the contents
Before the XLAT instruction can be executed, the lookup table containing the values for the new code must be put in memory, and the offset of the starting address of the Operands, Clocks, Size in bytes. 8086, 286, 386, 486. table offset, 11, 5, 5, 4, 1. Example. XLATB Set AL to memory byte DS:[(E)BX + unsigned AL]
You can for example use it to translate index of food in menu into price for food, if your food index is 0..255 and price will fit into 8 bits too. Then you reserve 256 bytes for table containing price data, and load ds:bx with address of that table, put index of food into al , and the xlat will translate the index into
The contents of the byte that is AL bytes from the start of the translation table pointed to by DS:BX is copied into AL, i.e., the effect of XLAT is equivalent to the invalid statement: MOV AL , [BX + AL]. Example: Suppose a byte variable VAR1 has a value in the range 0 to 15. Display this value as a hexadecimal digit. .DATA.
14 Nov 2014
XLAT/XLATB - Translate Usage: XLAT translation-table XLATB (masm 5.x) Modifies flags: None 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 best way to discripe this is MOV AL,[BX+AL] Clocks Size Operands 808x 286 386 486 Bytes
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