Pseudorandom generator in Assembly Language

Question

I need a pseudorandom number generator algorithm for a assembler program assigned in a course, and I would prefer a simple algorithm. However, I cannot use an external libra

Answer 1

Using masm615 to compiler:

delay_function macro
    mov cx,0ffffh
.repeat
    push cx
    mov cx,0f00h
    .repeat
        dec  cx
        .until cx==0
    pop cx
    dec cx
    .until cx==0
endm

random_num macro
   mov  cx,64    ;assum we want to get 64 random numbers
   mov  si,0

get_num:    
   push cx
   delay_function    ;since cpu clock is fast,so we use delay_function
   mov  ah,2ch  
   int  21h
   mov  ax,dx     ;get clock 1/100 sec
   div  num       ;assume we want to get a number from 0~num-1
   mov  arry[si],ah   ;save to array you set
   inc  si
   pop  cx
   loop get_num   ;here we finish the get_random number