counter, adr string
one, dec 1

string, chr h
	chr e
	chr l
	chr l
	chr o
	chr r
	chr l
	chr d
	hex a
	hex 0

// if the current character is zero, halt
loopStart, loadi counter
skipcond 800
	halt

// otherwise, output it, increment, and loop
output
load counter
add one
store counter
jump loopStart