IC1 – 74LS641
IC2 – 74LS641
IC3 – 74LS33
C1 – DB25 connector
R – 2.2K?
74LS641 is an octal transciever for converting 5 to 3.3v and back.
74LS33 is a 3.3 Voltage Regulator.
DB25 is the parallel port male connector to attach to the Parallel Port.
2.2k Resistors are pull up resistors.