2.1 MUL

;Given three variables of type byte into memory, that represent respectly number of days, hours and minutes spent ;since a time T0. Calculate the total number of minutes passed since T0, and this value must be saved into variable of ;type word 'risultato'.
;-To extend the range of representable numbers, it is requested to work with a representation in pure binary
;-In the case of overflow of representation, write in 'risultato' FFFFh value

;IMPLEMENTATION
;It is need to do a sum of the input variables:
;-Conversion of days into hours
;-Sum of hours
;-Conversion of hours into minutes
;-Sum of minutes

;Interim operations executed on word
;Assess when is possible to get overflow in sum/multiplication operations

.MODEL small
.STACK
.DATA
day DB 46
hour DB 2
min DB 30
risultato DW ?
.CODE
.START

;DAYS
MOV AL,day
MOV CX,1440
MUL CX
JO overflow
ADD risultato,AX
JO overflow

;HOURS
MOV AL,60
MUL hour
JO overflow
ADD risultato,AX
JO overflow

;SUM MINUTES
MOV AL,min
CBW
ADD risultato,AX
JO overflow
JMP exit

overflow:
MOV risultato,0FFFFh

exit:
.EXIT
END