Rev. 0 / 1985-07-08
CASE Program Initialization
  initialize port 3 alternate functions (P3 = CBH)
  read memory location for interrupt from CPU (= reset interrupt)
  read memory location for interrupt to CPU (= reset interrupt)
  initialize two port 1 pins to enable reading interrupts to/from CPU
  reset all RAM cells from 00H - 7FH
  if necessary, reset RAM 80H - FFH except 80H, 90H, A0H, and B0H
  initialize stack pointer
  set serial port to mode 3 and multiprocessor comm (SCON = E0H)
  set double baud rate (PCON = 80H)
  set timer 0 to mode 2 to control timeout and polling frequency
   and timer 1 to mode 2 to be a baud rate generator (TMOD = 33H)
  set baud rate to 38.4 kBaud (TH1 = FFH, which provides that the
   oscillator frequency is 7.3728 MHz)
  set timer 0 to produce 0.4 ms time elements (TH0 = 0BH)
  set upper polling freq limit to default value 30 Hz (= load 53H
   into upper polling frequency limit register)
  set lower polling freq limit to default value 10 Hz (= load FAH
   into lower polling frequency limit register)
  set start reception timeout time to default value 4 ms (= load 0AH
   into start reception timeout time register)
  set byte-to-byte timeout time to default value 2 ms (= load 05H
   into byte-to-byte timeout time register)
  * RAM test (similar to that for trackball)
  * ROM test (            -"-              )
  enable timers (TCON = 50H)
  enable timer 0 interrupt (IE = 82H)
  enter scan loop
END Program Initialization