commit bb124e

2026-06-02 12:56:47 Bob Green: -/-

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`programming/runtime.md` ..
@@ 14,11 14,12 @@
	```
	You can use this option as many times as needed.

-	## Heap
+	## In Detail
+	### Heap

	`crt0` allocates all free memory from the end of the .bss area to the end of ram to the heap (malloc/free).

-	## Global Variables
+	### Global Variables
	crt0 sets the following global variables:

	uint8_t cpu_speed_mhz. This uses the counter in the PI/T to figure out roughly how fast the CPU is being clocked at. Within a MHz or so.
@@ 27,5 28,12 @@

	uint8_t running_in_rom. When non-zero, indicates that the code is running in ROM. 0 indicates it's running in RAM.

-
	To access any of these variables, simply ```#include <machine.h.>```
+
+	### On Exit
+	When `main()` returns or when `exit()` is called, a non-zero exit code will be printed as follows:
+	```
+	exited with status: <value>
+	```
+	No message is printed if the exit code was zero.
+	Control will then be passed back to the monitor