Microprocessor
A mask programmed ROM is

 programmed at the time of fabrication
 erasable electrically
 erasable and programmable
 programmed by the user

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.
 Indicates that the CPU has not received the HOLD request.
 Indicates that another master is requesting the use of the address and data buses.

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Microprocessor
In 8085 microprocessor system with memory mapped I/O, which of the following is true?

 Arithmetic and logic operations can be directly performed with the I/O data
 Devices have 8-bit address line
 There can be maximum of 256 input devices and 256 output devices
 Devices are accessed using IN and OUT instructions

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