Find the negative numbers in a block of data.

Statement: Find the number of negative elements (most significant bit 1) in a block of data. The length of the block is in memory location 2200H and the block itself begins in memory location 2201H. Store the number of negative elements in memory location 2300H

Sample problem 1:
(2200H) = 04H
(2201H) = 56H
(2202H) = A9H
(2203H) = 73H
(2204H) = 82H
Result = 02 since 2202H and 2204H contain numbers with a MSB of 1.

Source program : LDA 2200H MOV C, A : Initialize count MVI B, 00 : Negative number = 0 LXI H, 2201H  : Initialize pointer BACK: MOV A, M : Get the number ANI 80H : Check for MSB JZ SKIP : If MSB = 1 INR B : Increment negative number count SKIP: INX H : Increment pointer DCR C : Decrement count JNZ BACK : If count   0 repeat MOV A, B STA 2300H : Store the result HLT : Terminate program execution

Flowchart for program