EC8691 MPMC IAT II - Part B

In max mode, control bus signal S0, S1, S2 are sent out in _____ form

• decoded
• encoded
• shared
• unshared

If 8086 uses 16-bit I/O address, then it can address upto ______ I/O ports.

• 65536
• 128
• 4096
• 256

IN and OUT instructions are used in _____________

• I/O mapped I/O
• Memory mapped I/O
• both a and b
• none of the above

The fractional part of 8087 internal bus is ___ bits

• 90
• 15
• 70
• 68

________ instruction is used to wakeup the coprocessor and handover the execution.

• WAIT
• ESC
• LOCK
• TEST

Which of the following statements on DRAM are correct? <br />i) Page mode read operation is faster than RAS read<br />ii) RAS input remains active during column address strobe. <br />iii) The row and column addresses are strobed into the internal buffers using RAS and CAS inputs respectively.

• I & II
• III
• I & II
• all

In 8251, to select synchonous mode in the mode instruction format, the B1, B2 bits are set to _____

• 0,0
• 0, 1
• 1, 0
• 1,1

OBF and ACK are the signals used for _____

• mode 1 input
• mode 1 output
• mode 2
• none of the above

. ___ bit in ICW1 indicates whether the 8259A is cascade mode or not?

• LTIM=0
• LTIM=1
• SNGL=0
• SNGL=1

Which mode allows 8/16 character multiplexed displays to be organized as dual 4-bit/single 8-bit display units?

• Display Entry
• Display Scan
• strobed Input
• Scanned keyboard mode