E9 7F CFFFFFFFFFFFFFFD # UART TX
E9 7E CFFFFFFFFFFFFFFE # UART RX
# my assembler is shit and doesn't have labels
# this point is 0x4000000000000014 though
93 01 7E # Ld8 r1, RX
92 01 7F # St8 r1, TX
E9 03 4000000000000014 # jumpback addr
C0 03 # jump back
00