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External Hardware IO Address Map
From CoCopedia - The Tandy/Radio Shack Color Computer Wiki
Tandy designated IO addresses from $FF60 to $FF7F for add-on hardware, but several parties chose to build in the $FF40-$FF5F and $FF80-FF8F ranges as well. Here are known IO addresses for add-on hardware.
- FF40-FF4B Floppy Disk Controllers. See Hardware#Floppy_Disk_Controllers for list.
- FF40-FF4B MEGA mini MPI Serial UART A (gated via $FF7F)
- FF40-FF45 MEGA mini MPI Extended MPI Features (gated via $FF7F)
- FF40-FF41 Game Master Cart
- FF40-FF7F FHL Eliminator Dual Serial Ports (exact 8 byte range selected with jumpers, FF60-FF67 standard)
- FF40-FF7F FHL Eliminator HCA, RTC, Printer Port (exact 8 byte range selected with jumpers, FF70-FF77 standard)
- FF41-FF42 Becker Port used by CoCo3FPGA and some emulators for DriveWire access
- FF4C-FF4F Some third party Floppy Disk Controlers: Sardis, JFD, Disto Super Disk Controller, and Disto Super Disk Controller II
- FF50-FF5F Glenside IDE Controller (first jumper option)
- FF50-FF54 MEGA mini MPI YMF-262 sound generator (gated via $FF7F)
- FF50-FF57 Disto Super Disk Controller
- FF50-FF59 Cloud-9 SuperIDE Interface Default Address Range, modified with jumpers
- FF50-FF5F Disto Super Disk Controller II
- FF50-FF5B MEGA mini MPI Serial UART B (gated via $FF7F)
- FF59 Cloud-9 miniFLASH default address, modified with jumpers
- FF5A-FF5F CoCo PSG
- FF60-FF62 X-Pad Model GT-116
- FF64-FF67 Retro Innovations CoCoFLASH
- FF68-FF6B Deluxe RS232 Pak
- FF68-FF6B CoCo USB Serial Cartridge (default address, modified with dip switches)
- FF68-FF6B CoCoIO (first jumper option)
- FF6C-FF6F Direct Connect Modem Pak
- FF6E-FF6F MIDI Maestro
- FF70-FF7F Glenside IDE Controller (second jumper option) This conflicts with the MPI selection register.
- FF70-FF73 Am9511 Arithmetic Processor Unit Pak (default address, modified with dip switches)
- FF74-FF75 Cloud-9 TC^3 SCSI Interface default settings, modified with jumpers
- FF74-FF77 Disto Super Disk Controller II
- FF76-FF79 Wordpak RS
- FF78-FF7B CocoIO (second jumper option)
- FF78-FF79 & FF7C Cloud-9 SuperIDE Interface Real Time Clock
- FF7A-FF7B Orchestra-90 CC (26-3143)
- FF7D-FF7E Speech/Sound Cartridge (26-3144A)
- FF7F Multi-Pak Slot Selection Register
- FF80-FF84 Speech Systems Super Voice
- FF86-FF87 CoCo USB Host (default address, modified with dip switches)
- FF98-FF9C PBJ Wordpak/Wordpak II (this conflicts with the GIME on a CoCo3)
- FFE0-FFE9 & FFEF GIME-X for CoCo 3
Note some devices overlap each other; these devices will conflict and cannot be used together without modification.
Built-in IO devices:
- $FF00-FF3F Peripheral Interface Adapters (PIAs) Used for Keyboard, Joystick, Serial Port, Cassette, FIRQ, Sound, Horizontal and Vertical Sync Interrupts, Video Display Generator (VDG) modes
- $FF90-FFBF CoCo3 GIME Used for memory management unit (MMU) configuration, coco3 video modes/color palette/resolution, coco3 interrupt and fast interrupt controls, and timers
- $FFC0-FFDF Synchronous Address Multiplexer (SAM) Used to set clock speed, Video Display Generator (VDG) modes and memory location/size, and RAM/ROM mode
