Create README.md

C64_keyboard/README.md

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+C64:
+- https://geekhack.org/index.php?topic=50437.0
+- https://deskthority.net/workshop-f7/soarer-s-keyboard-controller-firmware-t6767.html
+- Soarer_Controller_v1.20_beta4.zip (26.10.2013)
+- https://www.waitingforfriday.com/wp-content/uploads/2017/01/C64_Keyboard_Schematics_PNG.png
+- http://kookye.com/wp-content/uploads/2016/02/Pinout-ProMicro.jpg
+- https://github.com/abzman/Keyboard-config-file/blob/master/C64_matrix.sc
+- https://github.com/dabonetn/C64USBKey/blob/master/C64USBKeyboard2.ino
+- https://raw.githubusercontent.com/abzman/Keyboard-config-file/master/C64_matrix.sc
+
+```
+//KeyBoard Arduino Pro Micro 
+//  Pin     Pin     Label			GPIO	pin (kirjaimet = columns (rivit), numerot = rows (otsikot))
+//   20       5       2 - SDA		PD1		A
+//   19       6       3 - SCL		PD0		B
+//   18       7       4 - A6		PD4		C
+//   17       8       5				PC6		D
+//   16       9       6 - A7		PD7		E
+//   15       10      7 - 			PE6		F
+//   14       11      8 - A8 		PB4		G
+//   13       12      9 - A9 		PB5		H
+//   12       13      10 - A10 		PB6		0
+//   11       14      16 - MOSI 	PB2		1
+//   10       15      14 - MISO 	PB3		2
+//   9        16      15 - SCLK 	PB1		3
+//   8        17      18 - A0 		PF7		4
+//   7        18      19 - A1 		PF6		5
+//   6        19      20 - A2 		PF5		6
+//   5        20      21 - A3 		PF4		7
+//   4        N/C
+//   3        1       1 - TX		PD3		8
+//   2        N/C
+//   1        11      8 - A8 		PB4		1
+```
+```
+	sense			PB6			PB2		PB3			PB1		PF7		PF6		PF5		PF4		PD3
+	strobe	PD1		1			ESC		LCTRL		PAUSE	SPACE	LGUI	Q		2		UNASSIGNED
+	strobe	PD0		3			W		A			LSHIFT	Z		S		E		4		UNASSIGNED
+	strobe	PD4		5			R		D			X		C		F		T		6		UNASSIGNED
+	strobe	PC6		7			Y		G			V		B		H		U		8		UNASSIGNED
+	strobe	PD7		9			I		J			N		M		K		O		0		UNASSIGNED
+	strobe	PE6		LANG_1		P		L			COMMA	PERIOD	LANG_3	LANG_4	MINUS	UNASSIGNED
+	strobe	PB4		BACKSLASH	LANG_2	SEMICOLON	SLASH	RSHIFT	EQUAL	INSERT	HOME	LANG_5
+	strobe	PB5		BACKSPACE	ENTER	RIGHT		DOWN	F1		F3		F5		F7		UNASSIGNED
+```
+Reset to GND couple of times, then (notice that com-port is different in programming mode):
+```
+& "C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude" -C"C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf" -v -p m32u4 -c avr109 -P COM5 -b 57600 -U flash:w:firmware\Soarer_Controller_v1.20_beta4_atmega32u4.hex:i
+```
+```
+.\scas C64_matrix.sc C64_matrix.bin
+.\scwr C64_matrix.bin
+```
+Tallettuu vaikka firmiksen uudelleenflashais!!!
+http://www.keyboardtester.com/tester.html
+