This USB-parallel cable allows you to connect your parallel printer to your computer via USB port.
Q: Is this a DB 25 pin Male cable?
A: on the parallel connection end , yes
Q: Is this cable compatible with an HP Laserjet 1100
A: Yes, you are correct. It is a 36 pin Parallel to 4 pin USB type A.
Q: Can this product be used the other way around?
A: No, The PC side of a parallel cable is different than the Printer Side of the cable. This is a USB to Parallel adaptor. Meaning it is USB on the PC side and Parallel on the printer side.
A: Here are 2 that you can get from your local Best Buy or online.
Q: Will this work with a parallel port scanner?
A: undefined
A: First, find out if there is a print driver for your printer to work with WIN10. I was using the cable for WIN7 OS then upgraded to WIN10. There were no WIN10 print drivers for my printers. New printers use USB or wireless so the cable adaptor will become a museum piece soon.
Q: Is this compatible with HP 2100 lazerjet ?
A: yes, it will be compatible with any printer that uses this type of connector.