commit b26e81

2026-03-21 15:10:58 Bob Green: -/-

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`programming/machine library.md` ..
@@ 9,6 9,12 @@

	## Serial I/O

+	```C
+	int _char_available(void);
+	char _getchar(void);
+	void _putchar(char c);
+	```
+
	## LED Control
	There's a block of 10 leds (LD7 on the SBC3-b3), and six of them can be used for anything you like. Led1 is furthest from the cpu: