What are the differences between the 370A and 370B or between 371A and 371B curve tracers?

What are the differences between the 370A and 370B or between 371A and 371B curve tracers?

Here are the differences in the 37xB compared with the 37xA.

The 37xB models use a 1.4M floppy drive which replaces the 720K drive on the 37xA models.

Allows saving screen images to the floppy in .bmp format.........shift/hardcopy

Allows saving curve files to the floppy in .csv format.............local/hardcopy

Centronics print port replaces GPIB plotter port function. All models still support GPIB communication for control and data transfer.

All other features/functions remain the same as 37XA.