The Knowledge Adda

Apparatus Used: Microprocessor kit, Keyboards

Assumption: Search the given byte of 05 numbers stored in the consecutive memory location and stored the address of memory location in the memory location 2100 and 2301. Assume byte is in the C register and starting address of the list is 2100 H. If byte is not found store 00 at 2100 and 2301 H.

Algorithm:

Memory Add	Mnemonics	Op-code	Comments
2000	MVI	B, 05 H	Set the counter
2002	LXI	H, 2100 H	Initialize memory pointer
2005	MOV	A,M	Move data in accumulator
2006	CMP	C	Compare with given byte
2007	JZ	2018	Jump at location if byte found
200A	INX	H	Increase the pointer
200B	DCR	B	Decrement the counter by 1
200C	JNZ	2005	Repeat until counter is zero
200F	LXI	H,0000 H
2012	SHLD	2300 H	Store 00 at 2300 H and 2301 H
2015	JMP	201C
2018	SHLD	2300 H	Store memory address
201B	RST	5	Set Breakpoint
201C	END		End the program

Description of used instruction:
MVI: This instruction is used to store 8 bit data in specified register.
LXI: This instruction is used to store the 16-bit data in the register pair designated in the operand.
MOV: This instruction is used to copy the content from source register to destination register.
INX: This instruction is used to increment the content of specified register pair by one.
DCR: This instruction is used decrement the content of specified register by 1.
JNZ: If result is not zero it will jump to the target address.
JZ: If result is zero it will jump to the target address.
JMP: Jump unconditionally at target address.
CMP: Compare data in memory/Register with accumulator
SHLD: The contents of register L are stored in the memory location specified by the 16-bit address in the operand and the contents of register H are stored in the next memory location.
RST 5: This instruction is used to set breakpoint for the execution.
END: This instruction is used to execute the program.

Result:

Input: 2100-10, 2101-01, 2102-03, 2103-04, 2104-08

Output: 2300

Procedure to look output

• After press ENTER, You will get first screen
• Press G and Provide Initial address (as 2000)
• Press SHIFT+4,You will get first screen again
• Press M and Provide Input location for Input (M2100)
• Press ENTER and Provide your Input at location (2100:10)
• Press ENTER and Provide your Input at location (2101:01)
• Press SHIFT+4
• Press G and Provide Initial address (as 2000)
• Press SHIFT+4,You will get first screen again
• Press M and Provide address for output (M2300) and press ENTER
• You will get your desired output.