> assuming you want to run this on Linux If you're in DOS (not NT/XP+, not sure about 9x), you can use the debug command to write to the serial and parallel po

> assuming you want to run this on Linux If you're in DOS (not NT/XP+, not sure about 9x), you can use the debug command to write to the serial and parallel ports. You can also use `ECHO > COM1` for serial, or for the parallel port `ECHO > LPT1`