The same rules for PC apply to the stack pointer. Even when byte-mode
instructions are executed, the stack pointer is incremented by a whole
word when using the indirect increment addressing mode.
If the source operand is indexed, and the destination is symbolic (PC +
index), then the base for the destination index is the program counter
*after* having fetched the source index.
Also, the addition of the index is done modulo 2^16 if the base points
within the lower 64 kB of memory.
Ctrl+C handling is done in ctrlc.c, and a break condition now persists
until the interactive reader begins to process the next command. The
condition is cleared by calling ctrlc_clear().
Daniel Beer
Mario Werner
Bruce G. Burns
Tamas TEVESZ