Which of the following does not have 8 data lines?

Answer: 8086 does not have 8 data lines.

• 8085 — 8-bit data bus, so it has 8 data lines.

• 8088 — variant of 8086 with an 8-bit external data bus (AD0–AD7), so it has 8 data lines externally.

• Z80 — 8-bit microprocessor with an 8-bit data bus, so it has 8 data lines.

• 8086 — 16-bit data bus (AD0–AD15, multiplexed with address lines), so it does not have only 8 data lines.

Therefore, the processor that does not have 8 data lines is 8086.