How to copy unix file to floppy

my unix box doesn't seem to recognize the floppy drive. I tried these different commands:
cat file1.txt > a:file1.txt result: file got copied to hd
cat file1.txt > a:\file1.txt result: file got copied to hd
mount -t vfat /mnt/floppy result: illegal option --t

my unix is SCO UNIX System V/386 Release 3.2

Please help!

I think SCO has the mcopy command:

mcopy file1.txt a: