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Give the different types of command words used in 8259a?

The command words of 8259A are classified in two groups
1. Initialization command words (ICWs)
2. Operation command words (OCWs)

Posted By:Alberta Miller Posted On: Oct 10

Assembly Language

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Give the operating modes of 8259a?

(a) Fully Nested Mode
(b) End of Interrupt (EOI)
(c) Automatic Rotation
(d) Automatic EOI Mode
(e) Specific Rotation
(f) Special Mask Mode
(g) Edge and level Triggered Mode
(h) Reading 8259 Status
(i) Poll command
(j) Special Fully ...

Posted By:Shannon Hughes Posted On: Mar 29

Assembly Language

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Define scan counter?

The scan counter has two modes to scan the key matrix and refresh the display. In the encoded mode, the counter provides binary count that is to be externally decoded to provide the scan lines for keyboard and display. In the decoded scan mode, the c...

Posted By:Adalbert Fischer Posted On: Jul 07

Assembly Language

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What is the output modes used in 8279?

8279 provides two output modes for selecting the display options.

1.Display Scan
In this mode, 8279 provides 8 or 16 character-multiplexed displays those can be organized as dual 4-bit or single 8-bit display units.

2.Display Entry
8279 allow...

Posted By:Harry Evans Posted On: Feb 09

Assembly Language

Comments: 0

What are the modes used in keyboard modes?

1. Scanned Keyboard mode with 2 Key Lockout.
2. Scanned Keyboard with N-key Rollover.
3. Scanned Keyboard special Error Mode.
4. Sensor Matrix Mode.

Posted By:Alexander Bouchard Posted On: Jan 04

Assembly Language

Comments: 0

What are the modes used in display modes?

1. Left Entry mode
In the left entry mode, the data is entered from the left side of the display unit.

2. Right Entry Mode.
In the right entry mode, the first entry to be displayed is entered on the rightmost display.

Posted By:Liam Bouchard Posted On: Mar 31

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