Make sure you have a formatted DOS floppy disk.
lpr -S server_name -P printer_name -o l file_name
The "-o l" option means the file is binary file.
In EE105 lab, the command becomes
lpr -S korchnoi -P 353-hp8000 -o l file_name
copy /b file_name LPT1
If LPT1 does not work, try LPT2, etc. This depends on your PC configuration.
Use the lpr command as usual.