X1 and X2: X1 and X2 are provided to connect a crystal or a RC network for generating the clock internal to the chip.
SID: input line for serial data communication.
SOD: output line for serial data communication.
VCC and VSS: Power supply.
The block diagram of the Intel 8085 is shown in the Figure 11.4 -
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Figure 11.4: Block diagram of the 8085.