Assembler Answers

FIND SIZE OF DELAY IF CRYSTAL FREQUENCY IS 4MHZ?

DELAY MOVLW 0XFF
MOVWF MYREG
AGAIN NOP
NOP
DECF MYREG,F
BNZ AGAIN
RETURN

PLEASE EXPLAIN HOW AND WHY TWO NOP USED HERE? AND EXPLAIN THIS OVERALL PROGRAM? I AM NEW TO ASSEMBLY LANGUAGE

To what extent is assembly language is an efficient method for producing computer programs?

I'm using programming C to design and implement a 24 hour clock on V850. The clock should display hours, minutes and seconds and provide the user with the ability to set the time. The clock must also able to display date in the format dd/mm/yy, display the day in format Mon, Tue,..., and also a stopwatch function. It does not matter how the user switches between the features. Can you help me with this?

Al's Last Chance Gas station sits on Route 190 on the edge of Death Valley. There is no other gas station for 200 miles. You are to write a program to help drivers decide if they need gas. The program asks for:
• The capacity of the gas tank, in gallons.
• The indication of the gas gauge in percent (full= 100, three quarters full = 75, and so on).
• The miles per gallon of the car.
The program then writes out "Get Gas" or "Safe to Proceed" depending on if the car can cross the 200 miles with the gas remaining in the tank.
Tank capacity:12
Gage reading:50
Miles per gallon:30
Get Gas!
Use integers for all input and all arithmetic.

Bob's Discount Bolts charges the following prices:
• 5 cents per bolt
• 3 cents per nut
• 1 cent per washer
Write a program that asks the user for the number of bolts, nuts, and washers in their purchase and then calculates and prints out the total. As an added feature, the program checks the order. It is usually a mistake if there are more bolts than nuts. In this case the program writes out "Check the Order." Otherwise the program writes out "Order is OK." In either case the total price is written out.
Number of bolts:12
Number of nuts:8
Number of washers:24

Check the Order

Total cost: 108

Write a program that calculates the annual cost of running an appliance. The program will ask the user for the cost per kilowatt-hour and the number of kilowatt-hours the appliance uses in a year:
Enter cost per kilowatt-hour in cents: 8.42
Enter kilowatt-hours used per year :653
Annual cost: 54.9826

Ohm's law relates the resistance of a electrical device (like a heater) to the electric current flowing through the device and the voltage applied to it. The law is:
I = V/R
Here, V is the voltage (measured in volts), I is the current (measured in amps), and R is the resistance (measured in ohms.) Write a program that asks the user for the voltage and the resistance of a device. The program will then write out the current flowing through it. Use floating point math.
Since V and R are integers (converted from user input) you must use a trick to do floating point division. Change the equation to this:
I = (V + 0.0)/R
The math inside parentheses is done first. So V + 0.0 is done first, and since 0.0 is floating point, so will be the result.

Write a program that asks a user for their birth year encoded as two digits (like "62") and for the current year, also encoded as two digits (like "99"). The program is to correctly write out the users age in years.
Year of Birth:62
Current year: 11
Your age: 49

----- another run of the program --------
Year of Birth:62
Current year:00
Your age: 38

At the State Fair Pie Eating Contest all contestants in the heavyweight division must weigh within 30 pounds of 250 pounds. Write a program that asks for a contestant's weight and then says if the contestant is allowed in the contest.