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Copied from Solder's home page:

  $FD00-$FD0F    ACIA-chip (6551/8551)
$FD00-$FD03 Effective range for ACIA
$FD03-$FD0F Mirrors of $FD00-$FD03
$FD10-$FD1F Userport 6529B-chip (original)
$FD10 Effective adress for 6529B (original)
$FD10-$FD1F Mirrors of $FD10 (original)
$FD10-$FD1F Userport-area (plus/4 with expansion)
$FD10 6529B-chip from userport
$FD11-$FD12 Centronics-printerport
$FD13-$FD14 Low-/high-switching for OS96
$FD15 Register for CSORY-RAM-expansion
$FD16 Register for Hannes-RAM-expansion
$FD17 Register for EPROM-/sRAM-expansion
$FD18-$FD1F Free (best for internal expansion)
$FD20-$FD2F Used by different hardware, decoded by PLA (pin 18)
$FD30-$FD3F 6529B for keyboard
$FD30 Effective adress for this 6529B
$FD31-$FD3F Mirrors of $FD30
$FD40-$FD5F SID-card, area for SID-chip
$FD40-$FD5D SID-chip
$FD5E DAC on digiblaster add-on
$FD5F ADC on digiblaster add-on
$FD60-$FD7F Area for expansion-userport
$FD60-$FD63 ACIA on card 1
$FD64-$FD67 ACIA on card 2
$FD68-$FD6B ACIA on card 3
$FD6C-$FD6F ACIA on card 4
$FD70-$FD73 6529B-emulation on card 1
$FD70 Effective adress for 6529B-emulation
$FD71-$FD73 Mirrors of $FD70
$FD74-$FD77 6529B-emulation on card 2
$FD74 Effective adress for 6529B-emulation
$FD75-$FD77 Mirrors of $FD74
$FD78-$FD7B 6529B-emulation on card 3
$FD78 Effective adress for 6529B-emulation
$FD79-$FD7B Mirrors of $FD78
$FD7C-$FD7F 6529B-emulation on card 4
$FD7C Effective adress for 6529B-emulation
$FD7D-$FD7F Mirrors of $FD7C
$FD80-$FD8F Joyport on SID-card
$FD80 Effective adress for joyport
$FD81-$FD8F Mirrors of $FD80
$FD90-$FDCF Free
$FDD0-$FDDF Area for ROM-banking
$FDE0-$FDE1 MIDI-interface
$FDE2-$FDEF Free
$FDF0-$FDFD Free
$FDFE Register on EPROM-card
$FDFF Register on sRAM-card
$FE00-$FE7F Free (best usage for a RAM-drive...)
$FE80-$FE9F SID-card, mirror from $FD40... for hungarian-compatibility
$FE80-$FE9D SID-chip
$FE9E DAC on digiblaster add-on
$FE9F ADC on digiblaster add-on
$FEA0-$FEBF Free (?)
$FEC0-$FECF Floppy 1551, device 9
$FED0-$FEEF Free (?)
$FEF0-$FEFF Floppy 1551, device 8


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