5 numbers are stored at Memory Location. Write a program to add all values. Output should in BCD.

### Assumptions:
- Internal memory locations are sequentially numbered starting from 0x40.
- Each number is stored in BCD format (one BCD digit per byte).
- Output the sum of these numbers in BCD format.

### Program Flow:

1. **Initialize Registers:** Set up registers to hold the current sum and temporary values.
2. **Load Numbers:** Load each BCD number from memory into a register.
3. **BCD Addition Loop:** Use a loop to add each number to the sum, taking care of BCD addition (adjusting for carry).
4. **BCD Adjustment:** After each addition, check and adjust for BCD overflow (if sum 9, add 6 to correct the BCD).
5. **Output the Result:** Store the final sum in memory or output it directly.

### Assembly Code:

```assembly
ORG 0x0000 ; Start address of the program

MOV DPTR, #0x40 ; Point DPTR to the starting address of numbers in memory (0x40)
MOV R0, #5 ; R0 will be the counter for 5 numbers
MOV A, #0 ; A will hold the sum
MOV R1, A ; R1 will hold the carry for BCD adjustment

ADD_LOOP:
MOVX A, @DPTR ; Load BCD number from memory into accumulator A
INC DPTR ; Point to the next memory location

ADD A, R7 ; Add A to the sum in register R7 (accumulator for BCD addition)
DAA ; Decimal adjust accumulator to handle BCD addition

MOV R7, A ; Move the result from accumulator A back to R7
MOV A, R7 ; Move the sum back to accumulator A for adjustment

; BCD adjustment if necessary
CLR C ; Clear carry flag
MOV B, A ; Move A to B for checking
ANL A, #0x0F ; Mask upper nibble
ADD A, R1 ; Add carry from previous operation
MOV R1, A ; Save the new carry

ANL B, #0xF0 ; Mask lower nibble
ADDC A, B ; Add lower nibble with carry

MOV R7, A ; Move adjusted sum back to R7

DJNZ R0, ADD_LOOP ; Decrement R0 and loop if not zero

; At this point, R7 contains the final BCD sum

; You can store R7 to a memory location or output it as needed
; For example, to store it at memory location 0x50:
MOV DPTR, #0x50 ; Point DPTR to the storage location
MOVX @DPTR, R7 ; Store R7 to memory

END ; End of program
```

### Explanation:

- **ORG 0x0000:** Sets the origin of the program. Adjust as per your specific starting address.
- **MOV DPTR, #0x40:** Initializes DPTR to point to the starting address (0x40) where BCD numbers are stored.
- **MOV R0, #5:** Initializes R0 to 5, the number of BCD numbers to add.
- **MOV A, #0:** Initializes accumulator A to zero, which will hold the sum.
- **MOV R1, A:** Initializes R1 to zero, which will hold the carry for BCD adjustment.

- **ADD_LOOP:** Label for the loop that iterates 5 times (controlled by R0).

- **MOVX A, @DPTR:** Loads the BCD number from memory into accumulator A using indirect addressing via DPTR.
- **ADD A, R7:** Adds accumulator A to register R7, which serves as the accumulator for BCD addition.
- **DAA:** Decimal Adjust Accumulator adjusts A to ensure BCD correctness.
- **MOV R7, A:** Moves the result from accumulator A back to R7.

- **BCD Adjustment:** Checks and adjusts for BCD overflow:
- **CLR C:** Clears the carry flag.
- **MOV B, A:** Moves A to B for checking the upper nibble.
- **ANL A, #0x0F:** Masks the upper nibble of A.
- **ADD A, R1:** Adds carry from previous operation.
- **MOV R1, A:** Saves the new carry.
- **ANL B, #0xF0:** Masks the lower nibble of B.
- **ADDC A, B:** Adds the lower nibble with carry.

- **MOV R7, A:** Moves the adjusted sum back to R7.

- **DJNZ R0, ADD_LOOP:** Decrements R0 and jumps back to ADD_LOOP if R0 is not zero (loops 5 times).

- **END:** Marks the end of the program.

### Notes:
- Ensure you have the correct starting addresses and memory locations for your specific setup.
- The 8051 microcontroller uses registers like R0-R7 and accumulator A for arithmetic operations.
- Adjust the storing or outputting of the final sum (stored in R7) as per your requirements (e.g., storing to another memory location or displaying on an output device).

This program demonstrates how to add five BCD numbers stored in internal memory on an 8051 microcontroller and produce the sum in BCD format. Adapt it based on your specific assembler and microcontroller setup.