SYMBiFACE II:I/O Map Summary

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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 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
#FD0B IDE Sector Number IDE Sector Number
#FD0C IDE Cylinder Low IDE Cylinder Low
#FD0D IDE Cylinder High IDE Cylinder High
#FD0E IDE Device/Head Register IDE 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
(for writing to ROMs)
Don't map Upper ROM to 4000h-7FFFh
(default)
#FD18 PS/2 Mouse Status N/A
#FD19-#FD3F ? ?

See also