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If MBYTES input is high, then the pin serves as

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in Microprocessor by (39.4k points)
If MBYTES input is high, then the pin serves as

(a) AEN

(b) CEN

(c) AEN and CEN

(d) None of the mentioned

I have been asked this question during an online interview.

This intriguing question comes from 80286 Minimum System Configuration,  Interfacing Memory and I/O Devices With 80286 topic in section 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

1 Answer

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by (49.2k points)
Right choice is (a) AEN

To explain: The MBYTES input selects the function of AEN/CEN pin. If MBYTES is high, the pin serves as AEN, else it serves as CEN. The CEN pin is used for selecting one of the available 82288s.

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