Here is a sample program that adds 10 data bytes stored in memory locations starting at 0x2500
and displays the sum at memory location 0x2100
:
MVI A, 00H ; Initialize the accumulator to 0
MVI C, 0AH ; Initialize the counter to 10
ADD_LOOP:
MOV B, M ; Load the next data byte into register B
ADD B ; Add it to the accumulator
INX H ; Increment the memory pointer to point to the next data byte
DCR C ; Decrement the counter
JNZ ADD_LOOP ; Repeat the loop if the counter is not 0
STA 2100H ; Store the sum at memory location 2100H
HLT ; Halt the program
To check for a carry and store 01H
at memory location 0x2100
if a carry is generated, we can add the following instructions before the STA 2100H
instruction:
MOV A, C ; Move the carry flag to the accumulator
RLC ; Rotate the accumulator left, setting the carry flag if a carry was generated
MOV B, A ; Move the rotated value of the accumulator to register B
ANI 01H ; AND register B with 1, leaving only the least significant bit
STA 2100H ; Store the result at memory location 2100H
Here is the complete program:
MVI A, 00H ; Initialize the accumulator to 0
MVI C, 0AH ; Initialize the counter to 10
ADD_LOOP:
MOV B, M ; Load the next data byte into register B
ADD B ; Add it to the accumulator
INX H ; Increment the memory pointer to point to the next data byte
DCR C ; Decrement the counter
JNZ ADD_LOOP ; Repeat the loop if the counter is not 0
MOV A, C ; Move the carry flag to the accumulator
RLC ; Rotate the accumulator left, setting the carry flag if a carry was generated
MOV B, A ; Move the rotated value of the accumulator to register B
ANI 01H ; AND register B with 1, leaving only the least significant bit
STA 2100H ; Store the result at memory location 2100H
HLT ; Halt the program
Note that this program assumes that the data bytes to be added are stored in consecutive memory locations starting at 0x2500
. It also assumes that the memory location at 0x2100
is available for storing the result
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