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Official Name: Initialize

Call Address: 4062

This routine resets all RAM and jumps to Mon.




This routine does not return.


  • out (00),C0
  • ld sp,FFFF
  • load zero into 8000-FFFF,0000
  • initialize RAM with default values
  • setup default error handler (MonErrHand)
  • save SP at onSP
  • display "Mem cleared"
  • call HomeUp
  • call CursorOn
  • clear kbdScanCode by calling GetCSC
  • call GetKey (read: wait for a key)
    • Before this call, bit onClrScrn,(iy+onFlags) has been set so when the user turns off the calculator, the on-key interrupt handler will clear the screen when the calculator is turned on again. This is necessary because when you press the on-key to turn the calculator on, the on-key interrupt handler does not return, but resets SP using onSP and jumps directly to Mon.
  • call ClrScrn to remove the "Mem cleared" message on the first keypress.
  • res onClrScrn,(iy+onFlags)
  • jump to MonForceKey to handle the keypress returned by the GetKey call and hand over control to Mon.