1990 scat trak 1300 hd

Question, my grandfather had a 1990 scat trak 1300 hd I'm assuming the year from pics I've seen online. I can not find manual or any paperwork on it. Where can I find serial number or model number on the machine? Where could I go to get the manual or can I down load it? Not finding to much on the internet. Thanks

1990 scat trak 1300 hd