Which transistors are used in the KIM-1 and clones? The LED driver and serial circuit require transistors.
MOS Technology used the 2N5371 and 2N5375, in later KIM-1s a wider variety of equivalents is used. A question in forum64.de in the Nachbau KIM-1 thread made me look at my KIM-1s. Here is the result:
http://retro.hansotten.nl/6502-sbc/kim-1-manuals-and-software/transistors-in-the-kim-1/