Identify the data width and interface style of the Intel 8085A: what kind of CPU is the 8085A in terms of word size and data transfer (serial vs. parallel)?

Introduction / Context:
Classifying a microprocessor by word size and data movement style helps predict performance, instruction set density, and peripheral interfacing. The Intel 8085A is a classic starter CPU in many curricula and labs.

Given Data / Assumptions:

• 8085A is historically known as an 8-bit microprocessor.
• It communicates with memory and peripherals using parallel buses.
• Address bus and data bus widths are standard features in its datasheet.

Concept / Approach:
An 8-bit CPU processes 8-bit data in the ALU in a single cycle, with larger values handled across multiple cycles. A parallel interface transfers multiple bits simultaneously across data/address lines, enabling higher throughput compared to serial transfer.

Step-by-Step Solution:

Verification / Alternative check:
Typical kits show address/data bus lines on 8085 trainers; timing diagrams indicate parallel bus transactions.

Why Other Options Are Wrong:

• 16-bit parallel: describes CPUs like 8086 (internally 16-bit).
• 8-bit serial: contradicts 8085A's parallel bus architecture.
• None of the above: incorrect because option C is accurate.

Common Pitfalls:
Confusing “address bus width” (16-bit) with “data width” (8-bit). The CPU is still categorized as 8-bit.

Final Answer:
8-bit parallel CPU