TABLE 1 - ATA Register Names


CS1FX (CS0): Address
Read 
Write
6
Alternate Status
 Control
7
obsolete not used
obsolete not used

 
CS3FX (CS1): Address
Read
Write
0
Data Register
Data Register
1
Error
Feature
2
Sector Count
Sector Count
3
Sector Number
Sector Number
4
Cylinder Low
Cylinder Low
5
Cylinder High
Cylinder High
6
Drive/Head
Drive/Head
7
Status
Command