Digital Electronics Flashcards
Who invented the first adding machine?
Blaise Pascal
Who developed a loom in 1801 using a punched card that caused patterns and pictures to be woven into fabric?
Joseph Marie Jacquard
Who was the English mathematician who developed the IDEA of a mechanical/digital computer?
Charles Babbage
____ published the book “The Laws of Thought” in 1854, which was the first systematic treatment of the use of logic, later being used to create a special branch of mathematics.
George Boole
____ created the first analog computer.
Vannevar Bush
The Mark 1 was the first electrical/mechanical
computer, created at Harvard by ____.
Howard Aiken
The first ELECTRONIC computer (using vacuum tubes) was created at the University of Pennsylvania in 1946 and was named the ____.
ENIAC
Electronic Numerical Integrator and Computer
The first commercially available computer was the ____, available in 1951.
UNIVAC 1
The transistor was developed by ____ in 1947.
Bell Laboratories
Why are transistors better than vacuum tubes?
- ) Less heat
- ) Less power
- ) Not as susceptible to damage (physical and electrical)
- ) More reliable
The ____ was developed in the 1960’s and is basically multiple transistors on a single chip.
IC (Integrated Circuit)
T/F: The TTL chip was widely adopted because of its low cost and redundancy.
True
T/F: Only several thousand transistors can be packaged on a single chip today.
False, millions.
The first PC was created in the 19__’s.
1980’s
The two categories of electronics studies are ____ and ____.
Analog and Digital
A ___ is a binary value of either 0 or 1
Bit
A ____ is a group of 8 bits.
Byte
Early DOS limited the main memory of a computer to only ___ kb.
640
____ allows all storage locations to be equally accessible.
Random Access Memory.
Hard Drives and Floppy discs are examples of ____ - Memory.
Auxiliary
What does BIOS stand for?
(Basic Input Output System)
Where is the BIOS located?
In the ROM (Read Only Memory)
T/F: Hard Discs last forever.
False, they will fail eventually.
The ____ memory helps compensate for the difference between the processor and the main memory.
Cache
____ memory is when auxiliary memory is used as part of the main memory.
Virtual
T/F: The component containing the Control Unit and the Processor is called the CPU.
True
T/F: Operations in Boolean algebra are grouped in brackets, parentheses, and braces.
True
The collector and base signals of a(n) ____ are 180 degrees out of phase
Inverter
A ____ amplifies the logic circuit power without inverting it.
Buffer
The maximum amount of logic circuit inputs that a single logic circuit can drive is a characteristic known as ____.
Fan-Out
The standard TTL output current is __ mA.
16mA
A diamond symbol on a buffer symbol indicates that it is a(n) ____-____ Buffer.
Open Collector
A bubble symbol drawn on the output of a symbol indicates ____ logic.
NOT
Buffer amplifiers can deliver up to __ mA at up to __ volts.
40mA at up to 30 volts.
The ___ is the Voltage that is being switched.
VCC (Voltage Common Collector)
What determines the voltage level of the VCC?
The voltage required by the load.
T/F: Two inverters can be used to create a buffer.
True
T/F: NOR gates are easier to manufacture than NAND gates.
False. NAND are easier.
T/F: NAND logic can be used for many functions.
True (Universal Function)
