The motherboard of the IBM PC 5150 has labels of letters followed by numbers. What are the letters representing? Examples being U1, P1, C1, T1 and Y1.
I am trying to ascertain which component is the crystal oscillator connected to the Intel 8284, so am particularly interested in the T1 and Y1 labels. There is also a C.ADJ label above T1, does this represent "clock adjust"?