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authordaniel-Jones <daniel@danieljon.es>2018-01-20 15:44:42 +1030
committerdaniel-Jones <daniel@danieljon.es>2018-01-20 15:44:42 +1030
commitc0b13d7fc1eeef8398f4ef4dad2b87ba34a392f4 (patch)
tree717e1485a2545163edfc03fa7a60634ea5da5d4e
parente4f040f94e27d1dbb4af3baef99b336da188938d (diff)
download8085-assembly-tasks-master.tar.gz
8085-assembly-tasks-master.zip
task 4, multiplication using sub routineHEADmaster
-rw-r--r--TASK4.asm29
1 files changed, 29 insertions, 0 deletions
diff --git a/TASK4.asm b/TASK4.asm
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+; CALLING A ROUTINE AND PREPARE A MEMORY ADDRESS
+; ROUTINE WILL REQUIRE 3 BYTES FIRST NUMBER -> SECOND NUMBER -> RESULT STORAGE
+; ROUTINE WILL MULTIPLY M WITH M+1 AND STORE RESULT IN M+2
+
+JMP START
+ ; DEFINE A LIST TO STORE OUR REQUIRED BYTES
+ ; DB = DEFINE BYTE
+ ; DS = DEFINE STORAGE. OPERAND IS NUMBER OF BYTES
+MULTI1: DB 05H ; MULTIPLICAND
+ DB 03H ; MULTIPLIER
+ DS 01H ; RESERVES "ONE BYTE OF STORAGE
+START: LXI H,MULTI1 ; LOAD HL AS POINTER TO MULTI1 LIST MEMORY ADDRESS
+ MVI A,0 ; CLEAR A
+ MOV D,M ; STORE MULTIPLICAND IN D
+ INX H ; INCREASE MEMORY POINTER TO GET MULTIPLIER
+ MOV E,M ; STORE MULTIPLIER IN E
+ MVI C,00H ; COUNTER SET TO 0
+ CALL MULT ; CALL MULTIPLY FUNCTION
+ INX H ; INCREASE MEMORY POINTER TO RESULT STORAGE
+ MOV M,A ; STORE RESULT
+ HLT ; HALT
+MULT: MOV B,A ; STORE A
+ MOV A,C ; MOVE COUNTER INTO A
+ CMP E ; COMPARE MULTIPLIER TO COUNTER
+ MOV A,B ; MOVE B STORAGE BACK INTO A
+ RZ ; RETURN IF ZERO FLAG SET (COUNTER == MULTIPLIER)
+ INR C ; INCREASE COUNTER
+ ADD D ; ADD MULTIPLICAND TO A
+ JMP MULT ; JUMP TO MULT \ No newline at end of file