Questions regarding architectures or design of specific parts, not consumer-related questions.

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0
votes
2answers
59 views

How does a computer control electric circuits? [on hold]

I would like to know how it is posible for a computer command to phisically start something like a motor or spotlight when they are on such a different scale. How can such a small signal have such a ...
0
votes
0answers
47 views

Should a MacBook emit EMF when wifi and Bluetooth are disabled? [migrated]

I have a couple of MacBooks. Using a Trifield EMF meter with radio/microwave capability, if I hold the meter near the laptop (where I understand the wifi antenna is located), I receive blips ranging ...
-2
votes
0answers
52 views

Design a 3 bit comparator [on hold]

Iterative designs for comparators are quite successful which makes use of 1-bit comparator cells to make n-bit comparator. My question is how can we design a 3-bit comparator with a 2-bit and one ...
0
votes
1answer
76 views

Confused what computer architecture is in real [on hold]

I am quite sure that this is a question which will be marked as "primarily opinion-based" but I would still like to ask it here only as you do not get so many intellectual, experienced and skilled ...
-3
votes
1answer
74 views

Tune radio with laptop [closed]

I want to sintonize (tune) local FM and AM radio stations with my laptop. I know nothing about electronics and thought this was the place to put my question, I don't know any site more relevant to ...
1
vote
3answers
162 views

How can a powersupply have a large input volt range

I see that computer power supplies that can take a voltage input of anything between 90V and 260V at a frequency between 47Hz and 63Hz. Meanwhile it can output power at a very precise voltage. How ...
0
votes
1answer
60 views

What is Front Porch and Back Porch of a video signal in CRT display? [duplicate]

What is a Front Porch used for? What is a Back Porch used for? What does it mean by active video?
2
votes
5answers
128 views

Fan Needs 12V, only have 9V

I recently bought a 12V small computer fan(about 1"X1") and it was running rather slow when I checked it with a 9V. The package says that the fan requires 12V to run at an optimized speed, so is there ...
0
votes
1answer
60 views

Error-Detecting Code and ASCII Character Code?

As ASCII character code uses seven bit to encode 128 characters and most computers manipulate an eighth-bit quantity as one byte and ASCII characters are stored one per eight bit, and an additional ...
0
votes
1answer
151 views

How can computer replace PLC in industrial machines? [closed]

I am having internship in a semiconductor manufacturing company and learning about machines in front-end section. Technicians say that the machines all use computers as they process multiple complex ...
0
votes
1answer
85 views

How do ALU flags communicate with the rest of the computer?

How are ALU flags connected to various parts of a computer? I've just finished building an 8 bit computer in Logisim that can add subtract and compare... and am wondering how I can make it multiply ...
0
votes
3answers
113 views

How are alphabetic characters programmed into a computer?

I'm no cs student, I'm a programmer. I have a couple of questions and a few assumptions that I will make here (correct me if I'm wrong please). From my understanding is that all the sequences of 1 ...
13
votes
5answers
4k views

Breadboard computer [closed]

Is it possible to make a simple computer entirely with breadboards and basic electronic components? Is it feasible to, for example construct a scientific calculator in this way?
2
votes
2answers
408 views

Using PC audio to listen to electrical noise on power line?

I have done a bit of research on digital filtering and I was wondering if it would be possible to use the audio hardware of my computer tu listen to the electrical noise on my powerline ? If it is ...
0
votes
1answer
95 views

How much faster would optical computation be?

If (when) we could figure out a way to do computations with light as opposed to electrons within circuits, how much faster would our computers be?
1
vote
2answers
66 views

Piezo contact mic into iMac - avoid signal spikes

I've wired an external piezo as contact mic to the TRRS 3.5 jack of an iMac and it is working fine - BUT the signal will just randomly stop after hitting the contact mic several times too hard, so I ...
3
votes
4answers
1k views

Is BeagleBone Black a microcontroller or computer?

I started working on BeagleBone Black, and I cannot find out whether BeagleBone is a microcontroller, or some kind of computer? If computer, what makes it a computer? I worked on different Cortex-M ...
1
vote
2answers
84 views

Is it possible to create a computer without sequential circuits?

Do computers (or FSMs) absolutely need sequential logic, or can it be done theoretically without? This seems impossible. Any proof of why it's not the case? (Showing that there can be no memory ...
1
vote
2answers
92 views

Historical electronic components used in computers

Early computers used vacuum tubes and relays as active components to process information. Later on, transistors replaced those as the main components used in computers development (transistorized ...
-7
votes
1answer
100 views

Is It Safe To Turn On a Dropped Laptop [closed]

My mother threw my Macbook out the windows and it landed on a flower pot. It has stayed intact however I'm reluctant to turn it on at risk of the hard drive getting damaged. Is it safe to power it ...
1
vote
2answers
77 views

Is it OK to use the USB 5v pin as power source?

I am doing some stuff in my case and I need a power source for one LED from inside my case. I looked up and there are two +5v pins on a USB header inside my case. Is it OK to use them as power ...
1
vote
0answers
65 views

find cache hit rate for direct mapped cache memory

I have this practice exam problem which I am having trouble with. I have gone over many slides but haven't been able to really get it. The question is I currently have an 8 block main memory with ...
1
vote
1answer
351 views

multicycle datapath vs single cycle datapath

I have a fairly simple question but have not been able to find a good answer googling. I understand how pipelining works by having 1 cycle per step, each instruction takes 5 cycles and they start ...
2
votes
1answer
59 views

Buck regulator to match an analog voltage

In desktop computers, it's common to have headers that control fans with a 0-12V analog output, capable of up to 1A. This works fine for one or two fans, but with more than three fans, you can exceed ...
0
votes
1answer
47 views

600 watts regulated DC for 3 seconds [closed]

In my area, due to frequent storms, there are frequently short mains power cuts lasting a second or two at most. While the shorter several-millisecond outages don't usually cause issues, the longer ...
0
votes
1answer
47 views

What are the meanings of the fields of this cache memory?

I have a cache memory simulator with this cache memory shown. The cache size is 64 bytes and the block size is 8 bytes. What is the decomposition into fields? If block size is 8 bytes, then ...
0
votes
2answers
74 views

Why does my mainboard power the cathode to turn the Power-LED off?

Close to all desktop motherboards have a pin header that is supposed to power an LED on the front of an enclosure with to indicate that the computer is on. In the documentation for my board, these ...
-1
votes
1answer
88 views

Why do laptops conduct electricity through the battery when they're plugged in and fully charged?

Electricity from an outlet goes through laptop batteries even when the battery is fully charged (to the best of my knowledge). This degrades the capacity of the battery (or so I've been told). It ...
0
votes
3answers
4k views

USB Flash drives up to 2TB? [closed]

I found USB Flash drives on aliexpress.com up to 2 TB. So much people bought them, and I'm reading feedbacks and 90% says: "It works perfectly, thanks", just a few customers have left a negative ...
1
vote
2answers
1k views

How to control the current output from usb slots of computers?

Is it possible to control output from a computer usb port so, for instance if I have a usb led I can make it blink or do whatever with it. Whenever I send a high signal it would glow and whenever I ...
1
vote
1answer
321 views

Micro and Nano Memory, Calculate Reducing Bits?

I ran into a question: in digital system with micro-programmed control circuit, total of 32 distinct pattern operation signal is ...
0
votes
1answer
30 views

Which are the spec bits in this cache?

I have a direct mapped cache of size S with the line size L. The cache is physically indexed and tagged. The physical address is 50 bits, numbered from 0 to 49 (with 0 being the least significant ...
0
votes
1answer
69 views

What is the difference between a virtually tagged and a physically tagged memory system?

I study computer architecture and this question came. What is the difference between a virtually tagged and a physically tagged memory system?
3
votes
1answer
221 views

adding two 64-bits number with m-bit carry ripple adder and multiplexer, a questions?

I ran into a question from computer architecture class. The professor says that for adding two 64-bit numbers A and B we use m-bit carry ripple adders and multiplexers such as following: and that ...
0
votes
1answer
129 views

RPM v read/write speed

I am a developer using languages like C++ and .NET. I am trying to understand how computers work at a lower level. Say I have a hard disk that is 7400RPM and 150MB read/write speed. My book implies ...
2
votes
2answers
186 views

Using a toggle switch to act as push button

Basically I want to use a toggle switch to turn on my computer. I need some sort of circuit so that the toggle switch will act like a push button. IE, I turn on the toggle switch but it only sends a ...
1
vote
1answer
309 views

Reduce 160 Volts AC to 100 - 110 Volts AC (EL Wire Tape) Help

I am trying to put EL Wire Tape in a project that I am working on. I decided to go and build an inverter for 12VDC to 100VAC and that fell through. I couldn't find any guides that helped on EL Wire ...
-2
votes
2answers
197 views

Where is the best place I can go to learn everything about the electronics-side of computers? [closed]

Throughout my childhood, I grew up learning about electronics and computers. I am starting to get to the point where I want to incorporate my knowledge of both into a single project. I have tried ...
2
votes
2answers
94 views

Detecting TVs with PC's graphics card

I'm interesting of how can graphics cards detecting what type of TV has connected with S-Video? TVs sent some indefiniter signal back to the computer? And how it's working (protocols, signals, freq, ...
2
votes
3answers
185 views

Is hardware flow control necessary?

I want to communicate using a serial cable to a device that uses RTS/CTS flow control and 115200 baud speed. I want to use this Sparkfun TTL to rs232 adapter, but it has no RTS or CTS pins. What can I ...
0
votes
2answers
221 views

Can we observe addresses, data and other signals on the microcomputer buses by an oscilloscope, a LED or even an ordinary DC voltmeter?

Microcomputers are dynamic devices that are synchronized by a clock oscillator. So the signals (E, R/W, CS, A15-A0, D7-D0...) appear on their buses only for parts of a microsecond and, as the buses ...
0
votes
1answer
142 views

What is the purpose of the thick blue line in this schematic?

On this schematic for a Z80 computer, there appears to be a thick blue wire connecting some components together. What is it? Googling yields no results: here is the schematic
0
votes
2answers
788 views

Determining memory address width from memory size

Given a computer A with 1024 x 16 memory and a computer B with 16K x 32 memory, how big are the registers of an Accumulator, program counter, instruction, temporary register, address register, data ...
2
votes
3answers
135 views

Curious how does ALU addressing work like in Assembly code?

When writing assembly code, say R1 = R2 + R3, it is pretty easy to understand the addressing procedure because all registers are close to the ALU. But I find it hard to see how does the ALU go to the ...
1
vote
2answers
265 views

How much RF-interference does a typical desktop computer produce? How much does a metal case without windows reduce it?

It's fairly common now to see desktop computers in cases with large windows cut in the sides. I've always been under the impression that if unshielded, computer equipment will produce a lot of radio ...
-1
votes
1answer
147 views

Parallel MAC unit based on modified booth algorithm

The below diagram is the parallel MAC structure. In parallel MAC both partial product addition and accumulation take place at same time. The partial product summation + accumulation unit of above ...
2
votes
1answer
297 views

What was the crysistor?

I'm reading through Jim Williams' "Analog Circuit Design: Art, Science and Personalities", and a mysterious component called a crysistor is mentioned. There are a few clues in the text, like the fact ...
1
vote
1answer
73 views

How do you reduce an 8 output ALU to a 4 or 3 output ALU?

I can implement the functions in the picture below, but then if I implement them independently, I would have 8 outputs to the mux. Our professors wants us to reduce the ALU to only 3 or 4 outputs, I ...
3
votes
2answers
4k views

How are microscopic transistors on microchips made?

How is something like a microchip which is already small as it is able to house even smaller transistors in the millions at such a micro-scale? It seems like such a feat for machine to be able to make ...
0
votes
1answer
190 views

What determines the maximum rotational speed of a hard disk drive?

Through my background research I understand that the limit on the rotation of a hdd is largely the product of heat and the specs of the physical disk, but I am puzzled by the round numbers advertised ...