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New AVR MCUs contain a list containing all interrupts, similar to the following (`attiny412.atdf`):
```
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### Step 1: Describe your environment
* OS version: Windows 7
* Arduino IDE version: 1.8.8
* MFRC522 Library version: V1.4.6
* Arduino device: ATtiny804
* MFRC522 device: MFRC522
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https://github.com/SpenceKonde/megaTinyCore/blob/9aa8c03f910e068f78abe6e226478897e157adef/megaavr/cores/arduino/Arduino.h#L62
Looks like you were going to define these for the following devices?:
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Since AVR-GCC 8, the new tiny are supported: https://gcc.gnu.org/gcc-8/changes.html
If I do a `find /usr/local/Cellar/avr-gcc -iname "*attiny817*"` I do get the following:
```
/usr/local/Cellar/av…
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Surprisingly in the long list of supported Atmel chips, these chips not currently supported.
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I'm able to burn a bootloader to an ATMEGA4809 (40 pin DIP) using jtag2updi, but when I try to upload a sketch I get the subject error:
```
avrdude: AVR Part "atmega4809{upload.workaround}" not foun…
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A support of the MegaCoreX will helpful because there are other boards with MegaAvr0 chips,
(Curiosity Nano, ATmega4809 Xplained Pro ...) which are not supported by Arduino directly.
https://github.…