Lab 1 Assignment

4. Write a program that plays a series of musical notes or sounds on the MIDI audio output. (Hint: syscall 33)

Pseudo Code:

1) Pitch is assigned to register a0
2) Duration of sound in milliseconds is assigned to register a1
3) Instrument is assigned to register a2
4) Volume is assigned to register a3
5) Syscall to play the tone

Mips code:

.globl main
.data
.text main: li $a0, 60 # pitch li $a1, 5000 # duration li $a2, 72 #instrument li $a3, 127 #volume li $v0, 33 # syscall to play the tone syscall li $a0, 10 #pitch li $a1, 5000 #duration li $a2, 72 #instrument li $a3, 127 #volume li $v0, 33 #syscall …show more content…
The address of the input string is loaded in the register $a0
2. The length of characters is loaded in register $a1.
3. The input string address is loaded to register $s0.
4. And the counter is initiated to zero i.e $s1=0.
5. New line character is loaded in register $s2.
6. The first character is read from the string. If this character is equal to the new line character then then program proceeds to the finish label. In the finish label the output string and the output value is printed.
7. If the character which has been read from the string is not equal to the new line character then value of the counter is increased by one.
8. After incrementing the counter the address of the string is incremented by one.
9. The loop executes until the character which is read is equal to a new line