Questions tagged [computers]

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

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Computer bus frequency and electricity frequency

From http://en.kioskea.net/contents/pc/bus.php3 A computer bus is characterised by the amount of information that can be transmitted at once. This amount, expressed in bits, corresponds to the width ...
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3answers
8k views

Where to get 12V from my computer?

Since I am having some trouble with a battery pack and a charger I want to use for a home robotics project I got a tip to just use some alternative power source and buy a new battery and charger once ...
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0answers
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why a 1 bit memory made of an AND gate will always output zero? this is not the case because there is an exception

in an educational video on youtube about memory and RAM, they said that in a 1-bit memory made out of an AND gate like this : "no matter what input we apply to input A afterwards, the circuit ...
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1answer
153 views

Is it possible to make a keyboard with "Game Controller" style printed circuit boards and buttons?

For a long time I've wondered if it's possible to make a keyboard with PCBs similar to the ones used in NES controllers or just video game controllers in general. If it can be done with keyboards it'd ...
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4answers
7k views

Electrical reason for the minimum altitude (-50 feet) in the computer specs?

Are if there any electrical reasons not to operate or store my Dell OptiPlex computers below the altitude of -50 feet, as written in the specifications? Screenshot of the original Dell OptiPlex ...
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4answers
931 views

Is it possible to replicate the ENIAC using logic gates

Can one rebuild a small scaled model of the original ENIAC computer using only logic gates?
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1answer
77 views

Backwards compatibility of PCIe AC coupling capacitors

The PCIe base spec mentions that platforms operating only at 2.5GT/s or 5GT/s may use AC coupling capacitors in the 75nF-265nF and that platforms supporting 8GT/s and above must use 176nF-265nF. ...
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1answer
1k views

Enable vendor-disabled hardware on tablet? [closed]

I have a nextbook tablet (one of those cheap things from walmart) that I was looking to try to improve the RAM situation on to breath some new life into it as it apparently only has 1G of it. I ...
2
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1answer
108 views

Doubt in pipelining forwarding in MIPS

I am fairly new to computer architecture and having a tough time solving problems based on pipelining. I was trying to solve a problem from this pdf I found on Google I have a doubt in part ...
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4answers
11k views

Buzzer on a computer mainboard

I would like to remove the buzzer on an Intel mainboard, and replace it with an LED with a resistor. Is there a standard voltage that I can assume that comes to the two ends of the buzzer? Why was a ...
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3answers
3k views

Why aren't current CPUs designed for more powerful cooling systems? [closed]

Chips on the present can't get smaller, higher speeds and voltages increase heating, so why don't CPU manufacturers aim for more powerful cooling systems instead of looking for parallelization? We are ...
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2answers
93 views

What is the most important CPU price factor [closed]

I have two intel CPUS with distinct features. intel i7 8550U intel i5 8300H Which have big performance difference with the cheaper 8300H being higher in memory ...
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1answer
67 views

Where or when is it unsafe to clean using compressed air? [duplicate]

There's this lesson on ICT for us in cleaning computers and their equipment. One of the components that can be used for cleaning is something called compressed air. Just to make sure, which computer ...
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9answers
2k views

Was the Intel 186 chip commonly used anywhere? Was it only found in industrial computers? Why not PCs?

I don't think the Intel 186 was in any "home computers" or PCs, but I see other people referencing it as a common chip. Also, I've heard that NEC V20s had the 186 instruction set in addition ...
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1answer
92 views

Why can't you make a thunderbolt 3 hub?

So laptops with thunderbolt 3 are pretty common, docks are common, every other kind of USB seems to be able to be used with a hub. I know thunderbolt 3 can be daisy chained, theoretically eliminating ...
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1answer
406 views

How can I modify single-cycle MIPS processor to implement jal command?

Hello Stack exchange community I was wondering which modification should I have to make in order to enable single-cycle MIPS processor to run a jal(jump and link) command? My most pressing confusion ...
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1answer
81 views

Will a computer fail sooner the more you use it? [closed]

Is a computer like a car in the sense that the more you use it the quicker it will break down? Assuming that we have a regular computer with SSD that is running 24/7 versus a computer that is run ...
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2answers
146 views

Which alcohol is bad to use when cleaning computers?

I heard there are some alcohols that are prohibited to be used when cleaning a computer or an electric device. Apart from beverages, which ones are these?
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5answers
8k views

How to find socket for keyboard connector?

I am looking for a socket which is able to receive the connector of the ThinkPad X41's keyboard. How do I identify the socket so that I can find it on the (German) market? Background: I want to build ...
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3answers
5k views

Low Voltage DC Automatic Transfer Switch

I am new to circuits and have a very basic knowledge, and am currently interested in building a simple circuit that would take 2 DC inputs each of 12V 1.5A and output 1 x 12V 1.5A input even if 1 of ...
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4answers
40k views

How does division occur in our computers?

How does division occur inside digital computers? What is the algorithm for it? I have searched hard in google but haven't got satisfactory results. Please provide a very clear algorithm/flowchart ...
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2answers
63 views

reversal of computer camera image [closed]

Why do so many embedded cameras in computers, etc., prsent a mirror image? It means anything with writing on it is backwards. Why is this desirable?
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1answer
48 views

How do I send a signal from my computer to my USB antenna

I'm trying to make an RC car that can be controlled by my computer. The heart of the car is a simple mother board from an old toy. It basically accepts a signal 49MHz from a controller with a 9V ...
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5answers
8k views

trigger alarm with relay from PC sound output

As a total beginner, I have a project of creating an alarm device for a sailing boat. The background is the following: a Mac-mini collects, by means of different computer programs, alarms from ...
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0answers
107 views

PWR ON motherboard with Touch sensor TTP223 and Transistor

I have a TTP223 touch sensor, a BC347 Npn transistor and 10Kohm resistor. I want to make a touch button as substitution for my pwr physical button on the case of my pc. On the motherboard I have 2 pin,...
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2answers
79 views

Why do server mainboards use different capacitors for their VRMs?

Recently I noticed that server mainboards use a different type of capacitor as part of their VRMs (after the inductor). I believe they are ceramic capacitors, whereas consumer boards usually use ...
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2answers
39k 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 ...
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3answers
2k views

PC ATX12VO (12V only) standard - Why does everybody say it has higher efficiency?

To my understandings, the new 12-volt only standard moves the 5V and 3.3V supplies off from the ATX power supply "box" to the motherboard. According to PC World (which is cited by Wikipedia),...
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2answers
182 views

What type of electronics is typically used to interface between PCs and custom hardware? [closed]

I have tried to make this question acceptable for StackExchange, I am not looking for buying advice, just either examples of hardware that could have been used or the name of types of devices I should ...
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2answers
164 views

Is it okay to use a 200W PSU as a replacement for a 500W one?

I had a strong PC which is no longer functional at this point. One day while i was using it, it made a click sound and turned off abruptly. It also gave some kind of burnt wire smell which made me ...
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3answers
120 views

Has there been any deliberate implementation of combinational logic soft error correction in any consumer-level product, like a CPU/microcontroller? [closed]

Prologue It is well known that many error detection, mitigation, and correction methods, such as parity or ECC, have been available in large memory banks, like for RAM, for decades now, and even in ...
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1answer
95 views

I spilled candle wax on the video card in my computer, should I be concerned?

I have just accidentally spilled lavender scented candle wax onto my video card. This is a RX480, the kind with holes that expose parts of the circuitry. the way the candle wax fell, it got onto that ...
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6answers
33k views

Does water actually damage or only temporarily disable electronics until drying out?

Does water leave any damage after drying out? If it does, where and how exactly does it? How can it be repaired?
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0answers
44 views

Single Light switch to turn on/off based on computer program running

Brand new here so please be gentle lol Im interested in creating a light switch that turns on/off based on whether a computer program is running (Mac for now). I'm not entirely sure what components I ...
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1answer
39 views

Can two x-bit ALUs/FPUs be combined to create an equivalent a single 2x-bit ALU/FPU?

I was wondering, can 2 16-bit ALUs/FPUs be combined to create a 32-bit ALUs/FPUs, or are 4 ALUs/FPUs required? I was wondering if lower precision ALUs/FPUs can be combined in any way to create a ...
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3answers
140 views

Are FPUs made of ALUs, and how many ALUs are needed to make up an FPU?

In GPUs/CPUs, are FPUs made up of ALUs? If not, what would be a smaller "logical unit" that FPUs are made up of? If FPUs are made up of ALUs, how many ALUs would it take to make up a 16-bit ...
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1answer
52 views

Choosing the right DC-DC converter for a computer

I am looking at converting a computer to run off of a 12V battery, which means replacing its PSU with a DC-DC converter. So, assuming that the computer is currently using 600 Watt PSU, then I assume ...
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1answer
75 views

Is a loose psu plugged into a three prong outlet but off a good thing to clip to an esd mat aligator clip?

I bought an anti static mat, ifixit portable, so I wear the wrist strap, clip it to the mat, the ground wire that came with the mat clips the the mat the other aligator clip clips to the grill of a ...
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2answers
80 views

Is unplugging computer power cable from PSU the same as electricity outage?

I am not sure if they are the same, but something puzzling just happened. My dell precision workstation 2007 has been fine ever since, with many, many power outages over the years. But there is a time ...
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1answer
66 views

Removed component on motherboard [closed]

(Is this even a electronics related or computer related?) Does anyone owns a Dell Optiplex 780 DT? I was adding a graphics card and I accidentally bumped the bracket into the PCB and I checked the ...
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2answers
65 views

Why computers can be modeled as sample and hold system

I was reading digital control system from book by Norman S.Nise and in book it is written that "computers can be modeled as a sample and hold system " Isn't computer is discrete time system ...
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2answers
12k views

What's the difference between delayed branch and branch prediction?

I'm studying how delayed branch works and I'm trying to distinguish delayed branch from branch prediction. What is the difference? Is delayed branch a means to facilitate a control hazard?
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2answers
441 views

Is EMI/EMC still a big concern for a PC case?

I've recently started looking into researching potential concerns when it comes to using a non-metal material for a custom PC case, specifically wood. I've seen people talk about heat, electrical ...
0
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1answer
50 views

Understanding USB Descriptors speed

I have several USB devices that are capable of running High Speed 2.0 (480 Mbps) mode but runs Full Speed 1.1 (12 Mbps) instead. Take for example a USB DAC: It advertise USB 2.0 compliant and fall ...
0
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1answer
47 views

Why is overflow error in two's complement addition represented by XOR-ing the last two carries?

The first chapter of my textbook on microcontroller theory has the following paragraph. Here is one of the examples provided. The book shows three such examples, but provides no explanation for why ...
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1answer
137 views

Can someone help me establishing the polarity of this dc jack on my laptop motherboard?

So my laptop charger port is fried and I wanted to establish the polarity of the points on the board so I can solder a off the shelf jack instead of the original one which is not available anymore. I ...
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2answers
57 views

Uninterruptible power supply - How it manages to provide electricity to electronic devices before it shutting down?

I believe there is a lag in time (I think the latency for the switch over can take some milliseconds) when a switch over to the battery backup happens. I understand the electric appliances like motor, ...
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0answers
236 views

Help needed finding laptop FFC keyboard connector

I have a Thinkpad T440 keyboard that I'd like to convert to a USB keyboard. I've been looking for an FFC connector for it and it's been difficult finding it. It has 32 pins and 0.5mm pin pitch. The ...
2
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1answer
200 views

8 Bit Computer Program Counter (4 bit Counter IC) Counting When Disabled

Awhile back I built a version of Ben Eaters 8 bit computer, on my build, I changed only AND, NOT, and OR gates to all NAND. Otherwise the design was exact. I tested it before touching it and found ...
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1answer
113 views

Building my own on-off button for a PC

I'm looking to build my own power button for my computer. Most motherboards have a pair of PWR_SW pins that your case power button typically attaches to via two ...

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