What I've copied from hk, can only guess what most of the features do! Main reason I went with the pro firmware was available and I figured I'd be future proofing
9XR Standard Features:
• 8 Channel PPM/9 Channel PCM
• Full Ball Bearing gimbals
• Adjustable Stick Length
• Digital Trims on all Primary Axis
• 16 Model Memory
• Assignable Switches
• Freely Assignable Channel Mixes
• Graphical Dual Rate and Exponential
• Sub Trim and Travel Adjust
• Flaps and Differential
• Throttle Hold
• Supports Heli/ Aero/ Glider Model Types
• Programming Templates Based on Model Type
• Supports M1, M2, M3, M4 stick modes
• 128 x 64 backlit Liquid Crystal Display
• Built in JR & Futaba Trainer Ports
• PPM & PCM Output
• JR Form Factor RF Modules (Orx Dsm2, Orx Open LRS 433Mhz etc)
• Programmable Timers
• Low Voltage Warning and Buzzer
• Supports 3s Lipo (Required)
• 9XR Firmware Pre-loaded
• AVR ISP Interface
• Internal 2.4GHz Antenna
Pro version adds
• ARM version of er9x radio firmware with EESKYPE simulater GUI support
• 24 channel support
• 48 free mixes
• Expo, Triple rates, Curves settings
• Voice alerts
• Telemetry display
• Atmel SAM3S ARM Cortex M3 , 32 bit Micro-controller , 512K flash , 64Kb of SRAM
• 4Mb EEprom for 30+ model storage
• Micro SD card (Included)
• Mini USB port, for access to SD card files and radio programing
• 1/2 Watt Audio Amplifier with digital control.
• RS232 Serial Port for External telemetry connection through Futaba trainer jack. (for DHT ,DXT)
• Logic level Serial Port for external Blue Tooth modules (HC-06,RN42)
• Dimable LED Back light
• Haptic Buzzer (pager vibrator) for trim center alert and alarm notifications
• Real "Tact" switches on menu keys, give positive feedback indication
• Built in bootloader. (Firmware can be updated in less than 15 seconds!)
• Full built-in Telemetry support for the latest RF modules. New DSM modules coming soon.
• Speaker and headphone outputs
• Ball Bearing gimbals
• Digital Trims
• Assignable Switches
• Freely Assignable Channel Mixes
• Graphical Dual Rate, Sub trims, travel adjust and Exponential
• Supports Heli/Aero/Glider and custom Model Types
• Programming templates based on model type
• Supports M1, M2, M3, M4 stick modes
• 128 x 64 backlit Liquid Crystal Display
• Built in JR & Futaba Trainer Ports
• JR Form Factor RF Modules (ORX Dsm2, ORX Open LRS 433Mhz etc)
• Programmable warnings
• 1.5Amp, 5V main switching regulator, with wide input voltage (6.5 - 30V) (uses 3S lipo connection same as 9XR)
• Rotary encoder with push switch port (rotary encoder not included - user upgrade)
• Support for 6-way switch and more 3 way switches. (User upgrade)
• And so much more!!
Cheers Jim