Changes
{|{{Prettytable|width: 700px; font-size: 2em;}}
|'''Port''' || '''Read''' || '''Write'''
|-
|'''#7Fxx''' ||N/A ||Standard RAM Expansion (512K) (decoded as 01111111xxxxxxxx)
|-
|'''#DFxx''' ||N/A ||Upper ROM Bank (decoded as 11011111xxxxxxxx)
|-
|'''#FD00-#FD05''' ||? ||?
|-
|'''#FD06''' ||IDE Alternate Status ||IDE Digital Output
|-
|'''#FD07''' ||IDE Drive Address ||IDE ''(Not Used)''N/A
|-
|'''#FD08''' ||IDE Data Register ||IDE Data Register
|-
|'''#FD09''' ||IDE Error Register ||IDE Features Register ''(Write Precomp Reg.)''
|-
|'''#FD0A''' ||IDE Sector Count ||IDE Sector Count
|'''#FD0D''' ||IDE Cylinder High ||IDE Cylinder High
|-
|'''#FD0E''' ||IDE SDH Device/Head Register ||IDE SDH Device/Head Register
|-
|'''#FD0F''' ||IDE Status Register ||IDE Command Register
|-
|'''#FD10''' ||PS/2 Mouse Status||N/A
|-
|'''#FD11''' ||ROM Enable SYMBiFACE II Roms||ROM Disable SYMBiFACE II Roms
|-
|'''#FD12-#FD13''' ||? ||?
|-
|'''#FD14''' ||RTC Data ||RTC Data
|-
|'''#FD15''' ||N/A ||RTC Index
|-
|'''#FD16''' ||? ||?
|-
|'''#FD17''' ||Map upper ROM to 4000h-7FFFh <br> (for writing to ROMs)||Don't map Upper ROM to 4000h-7FFFh <br> (default)
|-
|'''#FD18''' ||PS/2 Mouse Status||N/A
|-
|'''#FD19-#FD3F''' ||? ||?
|}
== See also ==
* [[Programming:SYMBiFACE_II|SYMBiFACE II documentations]]
[[Category:Programming]]
