Here is a first beta test for Teensyduino 1.48.

Linux 32 bit:

Linux 64 bit:

Linux ARM:

Linux ARM64:

Mac OS-X:


Changes since Teensyduino 1.47:

Support for Arduino 1.8.10
Drop support for old Arduino versions 1.0.6, 1.6.5 and 1.8.1
Improve Serial Monitor efficiency, Arduino 1.8.9 & 1.8.10 only
Update FastLED to 3.3.1, fixes compile error on Teensy LC (Daniel Garcia)
Fix more than 2 IntervalTimer instances on Teensy 4.0
Fix Teensy 4.0 low power mode for 24 MHz (Defragster)
Teensy 4.0 SPI signal drive strength changed on Teensy 4.0 (KurtE)
Fix I2S output on Teensy 3.0

The Serial Monitor improvement still has debug printing to Arduino's console. You'll see messages there as you open and close the serial monitor, or connect and disconnect Teensy. If you get any messages in red, especially any Java exceptions, please report them on this thread.