Listens on port 9756 for a command stream.

Dump commands:
	di <start> <end> 	- dump imem
	ds <start> <end>	- dump sprs
	dx <start> <end>	- dump xaddr

	Returns a string of hex pairs, each preceded by a space,
	with 8 pairs per line

Memory access commands:
	set mem <prefix> <start> <end>
	dump <prefix> <start> <end>

	<prefix> is one of:

		xram	- external ram or external stack
		rom	- code space
		iram	- internal ram or stack
		sfr	- special function register


	dump <addr>
	set bit <addr>

		bit addressable space

Set PC:

	pc <addr>

	Sets PC to specified address

	pc

	Returns current PC

Breakpoints

	break <addr>
	clear <addr>

Load a file

	file "<filename>"

Execution control:

	run <start>		- run starting at <start>
	run <start> <stop>	- set temporary bp at <stop>
	run			- continue
	next			- step over calls(?)
	step			- step one instruction

	reset			- reset the simulator
	res			- synonym?

Error messages:

	start with "Error:"
