this post was submitted on 04 Aug 2024
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A bunch of those points about ps2 are no longer accurate, it's emulated on modern computers.
Yeah but try pressing more than 4 keys at once on the PS2 keyboard and get back to me
That is a limitation of the keyboard not PS/2. Unlike USB which is limited to 10 simultaneous key presses, PS/2 supports full n-key rollover.
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Nothing to do with the interface. If your keyboard can only do 4 it means that the manufacturer has cheaped out on diodes and couldn't even be bothered to stagger the matrix enough to make you not notice.
I think you're confusing USB and PS/2. USB has (or used to have?) a limit on the number of keys you could press, whereas PS/2 supports n-key rollover.
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Preposterous, I've used emacs on a ps2 keyboard without issues.
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USB: Many designs and revisions, none of them perfect
Nah, USB 3.2 Gen 2x2 SuperSpeed is the best! And it took me only 30 minutes of reading articles and wiki pages to get that information! ^although^ ^I’m^ ^not^ ^sure^ ^what^ ^USB4^ ^Gen^ ^3×1^ ^is,^ ^but^ ^it’s^ ^only^ ^x1^ ^so^ ^can’t^ ^be^ ^that^ ^good,^ ^right?^
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I know this is a shitpost, but what's interesting is that even though USB doesn't directly interrupt the CPU it's still faster. USB is able to get the entire packet sent before PS2 even sends one. It's very interesting. So if you ever see anyone unironically saying there is less latency call them out!
Are PS/2 ports still operating on hardware interrupts these days? I would expect these to be emulated as USB devices at this point, depending on whatever I/O chipset is in play.
The bit about USB asking the CPU is kinda true? My understanding is that it's a packet protocol of sorts, so it's really just writing post-it notes for each button press and leaves them on the CPU's whiteboard for later.
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I haven't seen a device with those in a very long time.
A device, no. A motherboard? Yup.
I recently bought a motherboard with a N100 processor, that had two 3.0 USB Ports, two 3.1 USB Ports, an HDMI and a DisplayPort. Because of that I was surprised to learn that it had also two PS/2 ports for a keyboard and a mouse.
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Same as VGA, shit just works, don’t need to worry about drivers or OS. So if your server shits the bed, you don’t need to worry about these things not working so you can can figure what went wrong.
Ok but Vega is still standard for servers, because you don't have to use proprietary bullshit like HDMI.
But just use DisplayPort instead.
Why? Nobody needs high definition from a server. Vega is literally unbreakable, super reliable and cost efficient. Display port would be a absolute waste just like HDMI. Same with most hardware applications that don't need high definition displays. The server ports are literally only used to set up the server.
This isn't just a royalties issue, its a issue of necessity.
IDK man, it would be great if my crash cart or KVM only needed one cable. I can’t wait for USB-C on servers to be everywhere
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If there is a fault in the PS2 device it literally breaks the rest of the computer.
A little more than 15 years ago I had to fix my PS2 keyboard because it crashed everything. Not even a BSOD, just colors.
looks nervously at my 3070ti and ibm model m haha so was there any permanent damage or like
No. It was when I was younger and I smacked the keyboard at some point. The whole computer crashed with random pixels all over the screen. I tried rebooting many times. I came to the conclusion the cable inside of the keyboard must have been slightly disconnected and pushed it further back into it, and my PC worked again.
Computers are really resilient to permanent damage to be honest. I once dropped a screw into a running computer and it short-circuited with sparks and all. I was still able to boot it, but it was extremely slow. After a few reboots it was back to normal.
Likely tripped some PTC "fuses". Often, with time to cool, they'll mostly return to normal.
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My keyboard uses PS/2 and although I do have a PS/2 to USB adapter, i prefer using my computers PS/2 port because it means one more USB port can be used for something else.
30+ years old and it runs flawlessly.
Isn't almost any keyboard able to last that long?
I make sure any motherboard I buy has at least 8 USB ports, so I know I'll have enough. It does make sense to use the PS/2 port if you have the peripherals. What advantage does USB have over it anyway?
I go through a cheap Logitech keyboard just about once every three years. I replace them when a a couple of keys stop working or when the nubs wear off of the center keys and can no longer blindly find where my hands go.
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Isn’t almost any keyboard able to last that long?
In theory, yes. In reality... not so much. Bluetooth keyboards are a joke for longevity, and a lot of wired keyboards these days just have piss poor build quality.
I don't think PS/2 inherently has major advantages over USB but as someone who uses a small PC with few USB ports, I appreciate having a PS/2 port available.
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I actually use a keyboard with that connector with a converter ( to USB ). It works pretty well.
Fyi, I’m using a very old happy hacking keyboard my father gave me
Here’s the picture of the keyboard I found on the Internet:
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Hahaa.. laughed at this, checked my computer only to see my keyboard is using this... It didn't at all bothered me all these years, so.. Long live
I'm glad to have it. I have to keep my old PS/2 keyboard plugged into that slot so I can get into the BIOS. My USB keyboard isn't recognized until it's too late to interrupt the boot process.
I had the same problem until I learned motherboards tend to prioritize the top usb slots or specific ones for the boot process. Switching to those fixed it for me. Any such luck?
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We asked our Dell sales guy this question years ago now, when they had been removed one year and quickly added back the next year.
They are there mostly for government builds, and other places with high security requirements. Usually the requirement is that they need to prevent any unauthorized USB devices from being plugged in. With the PS2 m&k ports they can disable the USB ports entirely in the BIOS.
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So you want to connect your mouse and keyboard, but all your usb slots are taken? I got your back, fam!
I used a ps2 mouse until about a year ago. If it ain't broke...
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