Swi example

main
  stmfd sp!, {r0-r12, lr}
  mov r0, #0
  adr r1, Char2
  adr r2, Char3
  adr r3, Char4
  adr r4, Int5
  mov r5, #23
  str r4, [sp]
  str r0, [sp, #-4]
  str r5, [sp, #-8]
  str r0, [sp, #-12]
  swi #203 ;show_1NumericInput
  ldmfd sp!, {r0-r12, pc}

Char2
  dcw 0x41, 0x42, 0x43, 0 ;ABC
Char3
  dcw 0x41, 0x42, 0x43, 0 ;ABC
Char4
  dcw 0x41, 0x42, 0x43, 0 ;ABC
Int5
  dcb 12, 0, 0, 0