There is Acrobat Reader 1.0 for MSDOS but it does not support modern PDF
format. I'm sure it has evolved so much that none of the current PDFs work
with it anyway.
It's available though on winworldpc for download and check.
If that doesn't work then I assume porting some open source to DOS is the
I think it is pretty safe to assume that everybody using FreeDOS in the
last 10 to 20 years has access to another, more capable device that can
read PDFs. Even low end cell phones have had this capability for the past
5 years.
I started with pure TXT files, composed on the same DOS machine that