ATA PIO Mode: Difference between revisions

| 8-bit / 8-bit

|-

| 1

| R

| Drive Address Register

| Provides drive select and head select information.

====Drive Address Register====

{| {{wikitable}}

|-

! Bit

! Abbreviation

! Function

|-

| 0

| DS0

| Drive 0 select. Clears when drive 0 selected.

|-

| 1

| DS1

| Drive 1 select. Clears when drive 1 selected.

|-

| 2 - 5

| HS0 - HS3

| One's compliment representation of the currently selected head.

|-

| 6

| WTG

| Write gate; goes low while writing to the drive is in progress.

|-

| 7

| n/a

| Reserved for compatibility with floppy drive controllers which may use this bit.

|}