Changes
/* FDC Command Table (15 commands) */
|-
| result byte 1 || colspan="8" | PCN: present cylinder number
|}
{| class="wikitable"
|+ Sense Drive Status (04h)
|-
! !! D7 !! D6 !! D5 !! D4 !! D3 !! D2 !! D1 !! D0
|-
| command byte 0 || colspan="3" style="text-align: center;" | x || 0 || 0 || 1 || 0 || 0
|-
| command byte 1 || colspan="5" style="text-align: center;" | x || HD || colspan="2" style="text-align: center;" | US
|-
| result byte 0 || colspan="8" | ST3: status register 3
|}
{| class="wikitable"
|+ Seek (0Fh)
|-
! !! D7 !! D6 !! D5 !! D4 !! D3 !! D2 !! D1 !! D0
|-
| command byte 0 || colspan="3" style="text-align: center;" | x || 0 || 1 || 1 || 1 || 1
|-
| command byte 1 || colspan="5" style="text-align: center;" | x || HD || colspan="2" style="text-align: center;" | US
|-
| command byte 2 || colspan="8" | NCN: new cylinder number
|-
| Execution || colspan="8" | Head is positioned over proper cylinder
|}
