Starting point for HW8 Question #2.

temp_starter.asm

;
; temp.asm - converts between celsius and fahrenheit
; Description - start code for HW8
;

.ORIG x3000

        LD R1, TEMP     ; load temperature
        LD R2, UNIT     ; load whether celsius/fahrenheit
        BRz CELS        ; if zero, interpret as C convert to F

        JSR F2C         ; call fahrenheit to celsius conversion subroutine
        BRnzp END       ; unconditionally branch to end
CELS    JSR C2F         ; call celsius to fahrenheit conversion subroutine

END     ST R1, OUTPUT   ; store output temperature
        HALT


; -------------------- CELS to FAHR CONVERSION SUBROUTINE -------------------- ;
; Description: converts temperature in celsius to fahrenheit
; Inputs: R1 - temp in celsius
; Outputs: R1 - temp in fahrenheit
C2F     RET


; -------------------- FAHR to CELS CONVERSION SUBROUTINE -------------------- ;
; Description: converts temperature in fahrenheit to celsius
; Inputs: R1 - temp in fahrenheit
; Outputs: R1 - temp in celsius
F2C     RET

; ----------------------- RAW VALUES STORED IN MEMORY ------------------------ ;
TEMP    .FILL x0017     ; temperature value decimal 23
UNIT    .FILL x0001     ; units: 0 for celsius, 1 for fahrenheit
OUTPUT  .BLKW 1         ; placeholder for output temperature

.END