8085-programming

[happy_boy]

how to generate factorial using 8085 instuctions?
means write a program for get factorial.

[henrygrik]

Source program :

* LXI SP, 27FFH ; Initialize stack pointer
* LDA 2200H ; Get the number
* CPI 02H ; Check if number is greater than 1
* JC LAST
* MVI D, 00H ; Load number as a result
* MOV E, A
* DCR A
* MOV C,A ; Load counter one less than number
* CALL FACTO ; Call subroutine FACTO
* XCHG ; Get the result in HL
* SHLD 2201H ; Store result in the memory
* JMP END
* LAST: LXI H, 000lH ; Store result = 01
* END: SHLD 2201H
* HLT

Subroutine Program:

* FACTO:LXI H, 0000H
* MOV B, C ; Load counter
* BACK: DAD D
* DCR B
* JNZ BACK ; Multiply by successive addition
* XCHG ; Store result in DE
* DCR C ; Decrement counter
* CNZ FACTO ; Call subroutine FACTO
* RET ; Return to main program


I hope so this will help you.