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# ATTinyCore **Universal**
Arduino support for almost every classic tinyAVR device! Supports ATtiny 1634, 2313/4313, 24/44/84, 441/841, 25/45/85, 261/461/861, 87/167, 48/88, 43 and 828.
## State of ATTinyCore
Development of ATTinyCore is proceeding in the v2.0.0-dev branch. It's not usable presently due to incomplete work, but that is what all future releases will be made from. Notably, I belive the variant pins_arduino.h files are complete, showcasing both the range of new information available to the core and user code for all parts, and the new, consisitent formatting.
ATtiny26 support looks like it may be coming after all....
Supports programming vis ISP, Serial (Optiboot) or VUSB (Micronucleus)
## [Check it out, we have "discussions" now!](https://github.com/SpenceKonde/ATTinyCore/discussions)
Let's use that, not gitter.
### Current **strongly** recommended IDE version: 1.8.13
Users of 1.6.x versions should use caution with any board manager packages as the handling of dependency versions, at least under 1.6.9, appears to be severely broken, such that installing one packages can break others. For example, DxCore won't work if ATYTinyCore is installed on 1.6.9! - both cores correctly specify their requirements, but the IDE does not use the correct versions of the toochain. It is likely that similar bugs involving other tools also manifest here. Use 1.8.13 or similar recent version if at all possible; if you are unwilling or unable to update your main Arduino IDE version, a "portable" installation is recommended - the separate copy of IDE *with portable installation* should ensure that what you do in that version does not effect the other version - if you can't use 1.8.13, a portable 1.6.9 version will achieve the same thing, only without the other fixes and improvements that went into the IDE since then.
### [Wiring and required external components](Wiring.md)
### [Using with Micronucleus boards](avr/extras/UsingMicronucleus.md)
### [Programming Guide](Programming.md)
### [Migration Guide - moving to ATTinyCore from a different ATtiny board package](Migration.md)