Can I use a high density diskette drive on a PCjr?
It depends. The PCjr controller card can handle 360KB 5 1/4 inch diskette drives and 720KB 3 1/2 inch diskette drives. The PCjr controller card can not generate the proper data for high density diskette drives. (These are the 1.2MB and 1.4MB types.) I think that the data rate on the controller card has to be significantly faster than what the PCjr can do. This is not a design flaw on the part of the PCjr; Only the PC AT had high density drives at that time, and it was considered a heavy duty piece of equipment. You can connect a high density drive to the PCjr, but you will have to use double density media to make it usable. (Double density media forces the drives to operate in double density mode, which the Jr can use.) Connecting a 1.44MB 3.5 inch diskette drive works well with 720KB double density diskettes. Connecting a 1.2MB 5.25 inch drive is not recommended because of track width differences, even if double density media is used. PC Enterprises had two solutions for running a hig
