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The 6502 chip is made up of 4528 transistors (3510 enhancement transistors and 1018 depletion pullup transistors).

To put it into perspective, 64KB of DRAM contains 524288 transistors, as 1 bit of DRAM needs 1 transistor.

Despite having so few transistors, the 6502 is generally viewed as twice as fast as the Z80 for the same clock speed. Two reasons explain it:

* The 6502 has an 8-bit ALU while the Z80 has a 4-bit ALU