+// test: ascii.exe | awk '/ 64\[40\] @/ { rc=1 } END { exit (1-rc) }'
+// test: ascii.exe | awk '/127\[7f\] DEL/ { rc=1 } END { exit (1-rc) }'
+// test: ascii.exe -c 4 | tail -1 | awk '/63/ { rc=1 } END { exit (1-rc) }'
+// test: ascii.exe -c 5 | tail -1 | awk '/51/ { rc=1 } END { exit (1-rc) }'
+// test: ascii.exe -c 6 | tail -1 | awk '/42/ { rc=1 } END { exit (1-rc) }'
+