next up is the 74LS362. it is a clock generator. you connect a crystal or square wave source and it produces four non-overlapping phased clock outputs. there is a separate VDD rail that can handle 12V for level shifting the outputs. i think this part was used in the TI 99/4A.
this is the 74LS624, which is a VCO (voltage controlled oscillator). i have no idea what it is doing in the 74xx series since it is totally analog!