If there are no eeprom(jumper mode) 8019AS EEDO must pull low. Don't let it floating.
Because the activeb must set to low. If it is pull high or floating the 8019AS may
enter inactive mode.

If the EEPROM are empty (all 0xFF) the 8019AS will enter inactive mode.
The software must use PnP initkey to active 8019AS.

The IOCS16B power on detect it is on word (16bits) or byte(8 bites) mode.
If power on latch is high it treate it in a 16bit slot.


If the 8019AS use 8 bits mode the DMA address use from 0x40 to 0x60. If 8019AS 
in 16 bits mode the DMA address use from 0x40 to 0x80. 

The link LED could replase by LED/BNC pin. This pin default for power saving.
If the 8019AS set the medium to Auto detect and the medium is 10base2 or 10base5 
the LED/BNC turn high to turn on -9V transformer.If the medium detect the good 
link pulse the LED/BNC turn low to cut off the transformer. 

About IOCS16B:
	The IOCS16B pull low by 27K, the host pull high this pin by 300 Ohm.
On the rising edge the 8019AS sense this pin's level to detect it is on 16(high)
or 8(low) bits mode. And the software write DCR to Word or byte mode. In most embedded
system they don't want to decode IOCS16B like x86 system. The simplex way is pull low
by 27K if they want to use 16 bit mode. The software config DCR to word mode
instead of detect the Remode DMA read from 0x00 to 0x??. If they want use 8 bit mode
the simplex way is put this pin to high and the software write DCR to byte mode.
The important thing is the command register (0x00 to 0x0f) only support byte mode.
The DMA port support byte or word mode.