assignment

; ; This sample CUSP program that prompts the user to enter an integer value. Then it asks the user which flag values that they want to change .EQU @, $100 ; Specify starting location (Default $000) .EQU PUT_NUM,$E00 ; MINI_OS write number routine .EQU GET_NUM,$E01 ; MINI_OS read number routine .EQU NUM, 1 ;number of valid values to be read .EQU PUT_STR,$E05 ; MINI_OS write string routine .EQU PUT_NL,$E06 ; MINI_OS write new line routine .EQU StackTop,$E00 ; top of stack ;initialize values START: LDS# StackTop ; initialize stack pointer CLR COUNT ; initialize loop counter CLR Result ; initialize output total ; show input prompt READ: PSH# P1_Length ; push on length of string PSH# Prompt1 ; push on string itself JSR PUT_STR ; print prompt to screen ADS# 2 ; clear stack JSR GET_NUM PSH# P3_Length ; push on length of string PSH# Prompt3 ; push on string itself JSR PUT_STR ; print prompt to screen ADS# 2 ; clear stack ; check to see if input is valid (not negative) VALID: JSR GET_NUM ; read first value CMA# 0 ; compare input value to 0 JGE CALC ; if value is valid (non-negative) begin calculations ;if invalid input print error message PSH# P2_Length ; push on length of string PSH# Prompt2 ; push on string itself JSR PUT_STR ; print prompt to screen ADS# 2 ; clear stack JMP READ ; go back to start of loop ; perform calculations CALC: ADA Result ; add values together STA Result ; and store result ; check loop condition INC COUNT ; add 1 to counter - i + 1 LDA COUNT ; put counter into ACC for comparison CMA# NUM ; compare number of values read to number wanted JLT READ ; if need another number jump back to start of loop ; print out answer FINISH: PSH# A_Length ; output answer message length PSH# Answer ; output answer message itself JSR PUT_STR ; print answer to screen ADS# 2 ; clear stack ;LDA Result ; ;DIV NUM ; ; load answer to be output JSR PUT_NUM ; print to screen JSR PUT_NL ; output blank line to improve readability PSH# A2_Length ; output answer message length PSH# Answer2 ; output answer message itself JSR PUT_STR ; print answer to screen ADS# 2 ; clear stack ; load answer to be output JSR PUT_NUM ; print to screen JSR PUT_NL ; output blank line to improve readability PSH# A3_Length ; output answer message length PSH# Answer3 ; output answer message itself JSR PUT_STR ; print answer to screen ADS# 2 ; clear stack ; load answer to be output JSR PUT_NUM ; print to screen JSR PUT_NL ; output blank line to improve readability ; end program DONE: HLT ; end program Prompt1: .CHAR 'Enter a non-negative value => ',P1_Length Prompt2: .CHAR 'No negative values allowed! Try again!',P2_Length Prompt3: .CHAR 'Which flag values you want to change',P3_Length Answer: .CHAR 'The starting value is ',A_Length Answer2: .CHAR 'The flag changed is number ',A2_Length Answer3: .CHAR 'The resulting value is ',A3_Length COUNT: .WORD 0 ; loop counter Value1: .WORD 1 ; input variable Result: .WORD 1 ; stores sum of inputs .END