Okay, in the 1st frame, the 1st shot is a strike. It goes to the 2nd frame with no score showing.
In the 2nd frame, your first shot is 3 pins, nothing should score yet (not with a strike up), 2nd shot
you get 0 pins, so between the two shots in the 2nd frame, you got 3 pins. After the 2nd shot is
when the strike counts 10, plus 3 pins, and then the score motor recycles (through the 1st
Players Strike/Spare Step Up Unit), and counts another 3 pins, so going into the 3rd frame,
your score is 16 with no marks showing. If in the 1st frame you pick 3 pins the 1st shot, and then
pick the remaining 7 on the 2nd shot, a spare should show, with no score yet showing going into the
frame. The 2nd frame, 1st shot, you pick 3 pins. The spare's 10 points chalks up, plus 3 points
for the 3 pins picked, so 13 points show, with the 2nd shot yet to be thrown. On the 2nd
shot, you pick the remaining 7 pins, the score should stay on 13 with a spare showing.
If the 2nd shot you only pick 6 of the 7 remaining pins, those 6 should count up showing
19 with no marks (spare or strike) showing going into the 3rd frame).
If you make a strike or spare, does it show on the backglass?