Hello Ken,
Your control with FAPT basically has two sides, the FAPT and the NC. The Seven Segment display is for the NC component of the control and is tantamount to the configuration of very early FS6 controls that had a Seven Segment display which was just about identical to the previous FS5 control; only a very few FS6 controls had the Seven Segment display, with later controls having a CRT screen display.
The normal mode of function of your control/machine is to create a part program using the FAPT, at the end of which, the NC program is passed to the NC Side of the control. This control, with the Seven Segment display, will drive you nuts if you try to create a part program directly by the using the NC Side of the control. Only one address at a time can be inserted and when inserting the next address, the whole of the previous code inserted is unseen.
The FAPT Side is quite powerful and was/is one of the better Conversational Programs available; the resulting part program is readable and operational exactly like any other NC program for a Fanuc Control.
Even when reusing an existing program at a later date, you would be well advised to get a PC connected to the control, so that the program can be easily viewed and verified as correct before uploading it to the control. Programs in memory can only be viewed address word by word.
Even from the point of view of normal program running, you will find that running the program via DNC, with appropriate Software, will be far more convenient than running a program from memory. Following is a picture of my Software connected to a FS5T control and running in DNC Mode. The big advantage is that a whole page of the program is displayed at any one time and the Pending Block is displayed in Highlight.
Regards,
Bill