8086 program to generate G.P. series of n numbers

Problem – Write a program in 8086 microprocessor to generate G.P (geometric progression) series of n numbers (numbers will be of 8-bit only), where size “n” is stored at offset 500 and the first number(a) is stored at offset 501 and store the common ratio is stored at offset 502 .Store the series into offset 600.

Example –

Algorithm –

1. Store 500 to SI and 600 to DI Load data from offset 500 to register CL and set register CH to 00 (for count).
2. Increase the value of SI by 1.
3. Load first number(value) from next offset (i.e 501) to register AL.
4. Store the value of register AL to memory offset DI.
5. Increase DI by 1.
6. Decrease the CL by 1.
7. Load second number(common ratio) from next offset (i.e 502) to register BL.
8. Multiply register AL and BL.
9. Store the result (value of register AL ) to memory offset DI.
10. Increase the value of SI by 1.
11. Loop above 3 till register CX gets 0.

Program –

MEMORY ADDRESS	MNEMONICS	COMMENT
400	MOV SI, 500	SI<-500
403	MOV CL, [SI]	CL<-[SI]
405	MOV CH, 00	CH<-00
407	INC SI	SI<-SI+1
408	MOV AL, [SI]	AL<-[SI]
40A	INC SI	SI<-SI+1
40B	MOV DI, 600	DI<-600
40E	MOV [DI], AL	[DI]<-AL
410	INC DI	DI<-DI+1
411	DEC CL	CL<-CL-1
412	MOV BL, [SI]	BL<-[SI]
414	MUL BL	AX<-AL*BL
416	MOV [DI], AL	[DI]<-AL
418	INC DI	DI<-DI+1
419	LOOP 414	JUMP TO 414 IF CX!=0 and CX=CX-1
41B	HLT	end

Explanation –

1. MOV SI, 500: set the value of SI to 500.
2. MOV CL, [SI]: load data from offset SI to register CL.
3. MOV CH, 00: set value of register CH to 00.
4. INC SI: increase value of SI by 1.
5. MOV AL, [SI]: load value from offset SI to register AL.
6. INC SI: increase value of SI by 1.
7. MOV DI, 500: set the value of DI to 600.
8. MOV [DI], AL: store value of register AL at offset DI.
9. INC DI: increase value of DI by 1.
10. DEC CL: decrease value of register CL by 1.
11. MOV BL, [SI]: load value from offset SI to register BL.
12. MUL BL: multiply value of register AL by BL.
13. MOV [DI], AL: store value of register AL at offset DI.
14. INC DI: increase value of DI by 1.
15. LOOP 414: jump to address 414 if CX not 0 and CX=CX-1.
16. HLT: stop