I seem to be missing one of the 12 ...even though grid is full?
The "numbers" for the 11 I have in clue order are 27, 31, 103, 94, 42, 96, 44, 6, 97, 19, 9
Well that was worth persevering with! 37 and 38 gave me my way into the theme. 18 provided the difference between top and bottom halves. Some tough clues but fortunately I knew about the 1d disk drives which helped.
Haven't exactly sorted the missing letters yet but can see the respective names in them. I assume I need to sort the letters into top half and bottom half clues rather than across and down clues?