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Readme.md: support for ATF16V8C 

Also added links to GALmate by Yorck and credited him for the ATF16V8C programming algorithm.
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@ -10,22 +10,26 @@ from various manfucaturers. It is based on work of several other people:
Manfred Winterhoff:
http://www.armory.com/%7Erstevew/Public/Pgmrs/GAL/_ClikMe1st.htm
Yorck Thiele:
https://www.ythiee.com/2021/06/06/galmate-hardware/
who did the most of the hard work of deciphering and publishing the programming
protocol of these chips. Their programs were Windows based and relied on
protocol of these chips. Some of their early programs were Windows based and relied on
presence of parallel port (LPT). Afterburner was written for Linux OS
(also works on Win32/64, Mac OSX64), and requires serial connection to
Arduio UNO, which does the programming of the GAL chip.
Supported GAL chips:
* Atmel ATF16V8B, ATF16V8BQL, ATF22V10B, ATF22V10CQZ
* Atmel ATF16V8B, ATF16V8BQL, ATF16V8C, ATF22V10B, ATF22V10CQZ
* Lattice GAL16V8A, GAL16V8B, GAL16V8D
* Lattice GAL22V10B
* National GAL16V8
* Lattice GAL20V8B via [adapter board](https://github.com/ole00/afterburner/raw/master/img/gal20v8_adapter.png)
**Please note that ATF16V8C or ATF16V8CZ are not currently supported.** Yes the B/C at the end of the part designator seems like a minor thing but in fact the programming protocol seems to be different compared to the B version (which is supported). Keep it in mind when ordering parts.
**Update 21/03/2023:** Added support for ATF16V8C. Based on GALmate code by Yorck. Upload the latest afterburner.ino sketch
and use parameter '-t ATF16V8B' with the PC app.
**Update 24/01/2023:** fixed an isse where GAL chip could be accidentally zapped/damaged during insertion into ZIF socket.
Please upload the latest afterburner.ino into your Arduino. The PC software may or may not need recompilation depending on its version.
@ -280,6 +284,8 @@ Other GAL related links:
- GAL chip info: https://k1.spdns.de/Develop/Projects/GalAsm/info/galer/gal16_20v8.html
- GAL chip programming protocol info: https://k1.spdns.de/Develop/Projects/GalAsm/info/galer/proggal.html
- GALmate: another open source GAL programmer: https://www.ythiee.com/2021/06/06/galmate-hardware/
- JDEC file standard 3A: https://k1.spdns.de/Develop/Projects/GalAsm/info/JEDEC%20File%20Standard%203A.txt