Question

MICROPROCESSOR Question -
Write an Airthematic Logical Program to multiply the two numbers stored in memory locations 2050 and 2051h and store the results in 2055 and 2056h. Also write a program in 8085 to enable all the interrupts in 8085 systems

Answer 1

Program for multiplication of two numbers

2000 LHLD 2050

2003 XCHG

2004 MOV C, D

2005 MVI D, 00

2007 LXI H 0000

200A DAD D

200B DCR C

200C JNZ 200A

200F SHLD 2055

2012 HLT

Explanation – Registers used: A, H, L, C, D, E

LHLD 2050 loads content of 2051 in H and content of 2050 in L

XCHG exchanges contents of H with D and contents of L with E

MOV C, D copies content of D in C

MVI D 00 assigns 00 to D

LXI H 0000 assigns 00 to H and 00 to L

DAD D adds HL and DE and assigns the result to HL

DCR C decreamentsC by 1

JNZ 200A jumps program counter to 200A if zero flag = 0

SHLD stores value of H at memory location 2056 and L at 2055

​​​​ HLT stops executing the program and halts any further execution

Program for enabling interrupts

START TRAP To Enable TRAP interrupt

RST 1

RST 2

RST 3

RST 4

RST 5

RST 6

RST 7

END HLT