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External Hardware IO Address Map: Difference between revisions

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= External Hardware IO Address Map =
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.  
 
Tandy designated IO addresses from $FF60 to $FF7F for add-on hardware, but several parties chose to build in the $FF40-$FF5F range as well. Here are known IO addresses for add-on hardware. Built-in devices (such as the SAM, GIME, PIAs, etc) are not included.


* FF40-FF4B Floppy Disk Controllers. See [[Hardware#Floppy_Disk_Controllers]] for list.
* FF40-FF4B Floppy Disk Controllers. See [[Hardware#Floppy_Disk_Controllers]] for list.
* FF40-FF4B [[MEGA mini MPI]] Serial UART A (gated via $FF7F)
* FF40-FF4B [[MEGA mini MPI]] Serial UART A (gated via $FF7F)
* FF40-FF45 [[MEGA mini MPI]] Extended MPI Features (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 Technologies 'no-halt' Controller|Sardis]], [[J&M/Owl-Ware|JFD]], [[Disto Super Disk Controller]], and [[Disto Super Disk Controller II]]
* FF4C-FF4F Some third party Floppy Disk Controlers: [[Sardis Technologies 'no-halt' Controller|Sardis]], [[J&M/Owl-Ware|JFD]], [[Disto Super Disk Controller]], and [[Disto Super Disk Controller II]]
* FF50-FF5F [[Glenside IDE Controller]] (first jumper option)
* FF50-FF5F [[Glenside IDE Controller]] (first jumper option)
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* FF50-FF5F [[Disto Super Disk Controller II]]
* FF50-FF5F [[Disto Super Disk Controller II]]
* FF50-FF5B [[MEGA mini MPI]] Serial UART B (gated via $FF7F)
* 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]]
* FF60-FF62 [[X-Pad Model GT-116]]
* FF64-FF67 [https://www.go4retro.com/products/cocoflash/ Retro Innovations CoCoFLASH]
* FF68-FF6B [[Deluxe RS232 Pak]]
* FF68-FF6B [[Deluxe RS232 Pak]]
* FF68-FF6B [https://github.com/barberd/cocousbserial CoCo USB Serial Cartridge] (default address, modified with dip switches)
* FF68-FF6B [[CoCoIO]] (first jumper option)
* FF6C-FF6F [[Direct Connect Modem Pak]]
* FF6C-FF6F [[Direct Connect Modem Pak]]
* FF70-FF7F [[Glenside IDE Controller]] (second jumper option)
* FF6E-FF6F [[MIDI Maestro]]
* FF70-FF7F [[Glenside IDE Controller]] (second jumper option) This conflicts with the MPI selection register.
* FF70-FF73 [https://github.com/barberd/coco9511pak 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]]
* 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)]]
* FF7A-FF7B [[Orchestra-90 CC (26-3143)]]
* FF78-FF7B [[CocoIO]]
* FF78-FF79 & FF7C [[Cloud-9 SuperIDE Interface]] Real Time Clock
* FF7D-FF7E [[Speech/Sound Cartridge (26-3144A)]]
* FF7D-FF7E [[Speech/Sound Cartridge (26-3144A)]]
* FF7F [[Multi-Pak]] Slot Selection Register
* FF7F [[Multi-Pak]] Slot Selection Register
* FF80-FF84 [https://colorcomputerarchive.com/repo/Documents/Manuals/Applications/Super%20Voice%20(Speech%20Systems).pdf Speech Systems Super Voice]
* FF86-FF87 [https://github.com/barberd/cocousbhost 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 [https://thezippsterzone.com/2019/03/27/gime-x/ GIME-X for CoCo 3]


Note some devices overlap each other; these devices will conflict and cannot be used together without modification.
Note some devices overlap each other; these devices will conflict and cannot be used together without modification.
Built-in IO devices:
* FF00-FF3F [[PIA|Peripheral Interface Adapters (PIAs)]] Used for Keyboard, Joystick, Serial Port, Cassette, FIRQ, Sound, Horizontal and Vertical Sync Interrupts, [[Video Display Generator|Video Display Generator (VDG)]] modes
* FF90-FFBF [[GIME|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 [[SAM|Synchronous Address Multiplexer (SAM)]] Used to set clock speed, [[Video Display Generator|Video Display Generator (VDG)]] modes and memory location/size, and RAM/ROM mode

Latest revision as of 21:15, 13 April 2026

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.

Note some devices overlap each other; these devices will conflict and cannot be used together without modification.

Built-in IO devices:

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