writeLoop INP
BRZ readLoop
writeStart DAT 350
LDA writeStart 
ADD one
STA writeStart
LDA count
ADD one
STA count
BRA writeLoop 
readLoop LDA count
SUB one
STA count
BRZ done
readStart DAT 550
OUT
LDA readStart
ADD one
STA readStart
BRA readLoop 
done HLT
count DAT 1
one DAT 1