RD #16
WR 100
 
RD #101
OUT 1
RD #11
OUT 1
RD #103
OUT 1
 
RDI #1000
OUT 22
RD #0
OUT 21
OUT
 
EI
 
M:
JMP M
 
KEYBOARD:
IN 21
OUT
 
RD #0
OUT 21
RDI #1001
OUT 22
RD #101
OUT 20
RD #101
OUT 1
RD #103
OUT 1
IRET