IBM Micro Channel Architecture (MCA) Which bus width combinations were specified by IBM’s Micro Channel Architecture for desktop systems?

Introduction / Context:
IBM introduced Micro Channel Architecture (MCA) as a successor to ISA in PS/2 systems. Recognizing MCA's bus widths helps place it historically between ISA/EISA and later PCI standards in terms of performance and capability.

Given Data / Assumptions:

• MCA targeted higher throughput and improved configuration (software setup).
• It was used mainly in IBM PS/2 lines, not broadly adopted industry-wide.
• Question asks for supported data path widths.

Concept / Approach:

MCA provided 16-bit and 32-bit bus implementations, improving bandwidth over 8/16-bit ISA and providing architectural features like bus mastering and better arbitration. It predated PCI but did not attain broad third-party support.

Step-by-Step Solution:

Verification / Alternative check:

IBM technical references and period documentation specify 16-bit and 32-bit MCA slots and adapters, confirming the correct combination.

Why Other Options Are Wrong:

8/16-bit: Matches ISA, not MCA. 16/24-bit: Not a standard pairing. 32/64-bit: 64-bit arrived later in other architectures, not in MCA desktops.

Common Pitfalls:

Confusing MCA with EISA or early PCI; assuming MCA reached industry-wide usage similar to PCI.

Final Answer:

16 bit & 32 bit