; this prints registers
; expect to be called as interrupt routine
isr_debug:
  push ss
  push es
  push ds
  push di
  push si
  push bp
  push sp
  push dx
  push cx
  push bx
  push ax

  call printf
  db "AX=%X BX=%X CX=%X DX=%X SP=%X BP=%X SI=%X DI=%X", 0x0A, 0x0D
  db "DS=%X ES=%X SS=%X IP=%X CS=%X FL=%X", 0x0A, 0x0D, 0

  pop ax
  pop bx
  pop cx
  pop dx
  pop sp
  pop bp
  pop si
  pop di
  pop ds
  pop es
  pop ss
  iret