Question

How to generate random numbers using assembly code in the range 1–4 ?

Answer 1

Don’t know what system you are trying to do this on, so here is a general answer, that should apply, no matter which:

query the system time, using whatever syscall / library call / api you have available
and out the top bits, leaving only the lowest 2

tadaa. randum numbers.

if you want them more random use perhaps do this instead:

query the system time
and out the top bits leaving only the lowest 4 store in "register1"
Loop:
       do something unimportant
       do something else unimportant
       etc.
       count down register1
       jump to EndLoop if register1==0
       jump Loop
EndLoop:
query the system time
and out the top bits, leaving just the lower two

Cheers!

/B2S

EDIT: Sorry, been on holiday out of internet’s reach. (yes, genuinely amazing that such places still exist) I’m not particularly familiar with either EyeBot nor 68k asm. So I don’t know the syscall to read in the clock or time (either will do). So look that one up, the rest of the code should be something like

//Assuming you have called the syscall to get the system time/clock, and stored it in D0
      AND #%01111, D0
loop: 
     // It really doesn't matter,
     // What Instructions you put here,
     // just put 4 or 5 instructions that don't
     // mess with D0, eg. AND, MOVE, ADD, AND, OR

      SUB #1, D0

      TST D0  // TST instruction is probably not needed
      BEQ EndLoop
      JMP loop
EndLoop:
//      Get the system time/clock again (Next instruction assumes clock is in D0)
      AND #%011, D0

D0 should now contain your random number