====== NEC PC-9801 - INT 1Ch ======

===== AH = 00h - Get System Time =====

**Input:**

  * AH = 00h
  * ES:BX = data buffer

**Output:**

  * buffer[0] = year (in two-digit BCD)
  * buffer[1] = month (in BCD)
  * buffer[2] = day (in BCD)
  * buffer[3] = hour (in BCD)
  * buffer[4] = minute (in BCD)
  * buffer[5] = second (in BCD)