求高人给解释一下这个文件的用途以及各行的含义

bupt_jacky

/etc/pcmcia/cis/aircard555.cis:
dev_info
  no_info
attr_dev_info
  EEPROM 250ns, 512b
manfid 0x013f, 0x0710
funcid serial_port
vers_1 7.0, "Sierra Wireless", "AirCard 555", "A555", "Rev 1"
config base 0x0700 mask 0x0073 last_index 0x03
cftable_entry 0x20 [default]
  io 0x03f8-0x03ff [lines=3] [8bit] [range]
  irq mask 0x3fbc [level]
cftable_entry 0x21
  io 0x02f8-0x02ff [lines=3] [8bit] [range]
cftable_entry 0x22
  io 0x03e8-0x03ef [lines=3] [8bit] [range]
cftable_entry 0x23
  io 0x02e8-0x02ef [lines=3] [8bit] [range]
cftable_entry 0x24
  io 0x0000-0x0007 [lines=3] [8bit]