Is PS/2 or USB Better for Keyboards and Mice?
ฝัง
- เผยแพร่เมื่อ 31 ก.ค. 2017
- Should you still be using those old PS/2 ports for your keyboards and mice?
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no keyboard detected press any key to continue
never found the 'any key' :(
Ikr it funny cause it not there
or just click a mouse button?
plot twist
It sounds like a joke nowadays, but in the days before PS/2 it was actually pretty useful. The predecessor of PS/2 was hot plug capable and many PCs did not use but some rather obscure key-presses to get into the BIOS setup. If the system did not show you the necessary key by default and you didn't know the correct key, you simply pulled the keyboard plug out and started the system.
Then you got the infamous "No keyboard found. Press any key to continue." message, often followed by something like "Or press to enter setup." Then you just plug the keyboard back in and continue. We had some systems where provoking this error was the only way to get into the BIOS setup. Ah, those were the days...
Beaker those were the (bad) days
The virgin usb keyboard:
> Has to wait his turn to get the cpu's attention
> Politely asks the cpu to accept the new input
> General purpose port, has to identify himself as a keyboard before the system know what to do with him
> Gets blocked when a virus kills all access to usb devices
> Hot sawappable and is okay with that
> Gets confused when you hit too many keys
The chad PS/2 keyboard:
> Always works, doesn't stop until power goes down
> Literally interrupts the cpu, tells it to work on its input before anything else
> Has his own dedicated port, system know who he is before even the bios is loaded
> Literally impossible to kill besides unplugging it
> Not hot swappable, when unplugged it crashes the whole system like a true alpha peripheral
> Couldn't care less how many keys you press, has full native n-key rollover
Yes
alpha peripheral 😂
I love this.
ThatLonelyFox you spent way too much time on this for just 100 or so likes
FUCK YEAH!
feel like its time for a new version of the PS/2 maybe PS/3?
da, gamers needs separate keyboard and mice ports like PS/#, that directly rule CPU.
A PS/3 would be perfect as a dedicated USB port with more features and backwards compatible. or Maybe special drivers that can make USB send System Interrupts.
we'll put valve right on it.
@@nacroni PS/2 was named after an IBM computer lineup. The PersonalSystem/2
And then comes PS/4 and PS/4 pro.
Holy crap! That's my stock photo for the ps2 adapter in the video thumbnail!
Wow!
Really!? Or are you joking?
Your photo's link please
He is joking lmfao
@@wof8131 How do you know? I barely know anything about stockphotos but how do you know.
PS/2 is obviously superior as you don't have to flip it 13 times to figure out which way it plugs in.
Zared Martorana proof that USBs exist in 4 dimensions.
Zared Martorana 1 year 1 month 1 day ._.
lmao
nice
WHY DO PEOPLE STILL SAY THIS?
THERES 2 FUCKING POSSIBLE WAYS AND ONLY 1 WORKS
ON TOP OF THAT, IF YOU HAVE ENOUGH LIGHT TO SEE YOU CAN FUCKING SEE WHICH WAY IS CORRECT
AND IF YOU CANT SEE YOUR OWN FUCKING HANDS WHAT THE FUCK ARE YOU DOING TRYING TO PLUG SOMETHING IN
TURN A FUCKING LIGHT ON EVEN IF ITS YOUR PHONE SCREEN
I CANT TELL IF THIS IS A JOKE
FFFFFUUUUUUUUUUCK!!!!
"Having my D pushed down" - Linus 2017
"...D key..."
Sounds even better
Ash Ketchum LOLLLLL
LinusSexTips 😂
Lol
+Specter Oh shut up...
Another advantage of PS/2 that seems nobody mentioned is the fact that dedicated ports also free up space for another USB devices you want to connect.
Tbh it's not like people constantly use the USBs at the back. Heck, most people cannot even use them without moving the case.
@@azaria_phd that takes away advantage of USB,its plug and play features
@@UsmanSiddiq1 Yup, many people too lazy to use the USB port in the back, and only rely to use front panel USB or use USB hub in their desk lol
@@da_pawz Really? Just about all my back ports are used - I'd welcome freeing one from my keyboard. Almost seems like a waste of a slot, honestly.
Currently chilling with my Mac that must have a hub connected if i want USB type a. A bit too much of one type of you ask me, HDMI and USB a would be nice
Hey, you should use that high speed camera to measure PS/2 vs USB latency.
With and without Ps2 Rate running I presume ;)
Kind of strange this about latency didn't came up in the video.
the difference wont be visually perceptible probably
People who claim that PS/2 is superior speaks straight bullshit, especially if they bring up latency. The difference is so unsignificant that it doesnt bring an advantage. In compatibility, PS/2 is very superior tho
I agree!
Poll rate is 1ms for USB1 and 0.125ms for USB2. Hardware and drivers are free to do worse than that, of course.
2:13
The legend says that the mouse is still waiting for a response from the CPU
stil waiting.....
But the CPU never wrote back...
"Right click" -Last online 69 years ago
Notice me CPU-senpai!!
The mouse said it was moving left. It didn't know that it was also left behind.
Where is the any key?
on the keyboard
@@Deaft_shot i was looking at the monitor
on the pc front, but you can also open your pc and mash a piece of metal around the motherboard to turn it off (permanent change)
@@Haitch_1_ idiot, it was on my table not the keyboard.
Nice Simpsons reference 🤣
For extreme overclockers, the USB controller will stop working at very low temperatures which is inconvenient for liquid nitrogen or helium overclocking. PS/2 on the other hand will work nonetheless allowing you to change the overclocking settings. This is why many high end overclocking motherboard still includes PS/2 ports.
Me: so my pc has 3 usb ports and 1 ps2 por-
My Friend: So it can play ps2 games?
Me: Well yes, but actually kind of
Tyler Dietz so what games do you have ?
Nothing lol
Hes too young
@@sukecchizu because its modern motherboard
Snag
The PS/2 ports also have higher interrupt priority than the USB ports.
This means it is possible for the PC to become so braindead that it will not accept any input from the USB device,. This means that even though the ctrl+alt+delete key combo would normally generate an unmaskable interrupt and crash the system, in certain cases of bad brain death the computer will refuse to respond to the keyboard and not do as told.
With a PS/2 keyboard, you don't have this problem and ctrl+alt+delete will reliably crash the system as intended.
Thats some usefull info
Had this happen last week, at startup, with an old computer. Good thing I have a spare ps/2.
sadly my G15 logitech doesnt work with the USB adapter to PS/2
Nor my mouse m100 normaly usb or the g9 mouse none of them :( i waste my money.
@@PescaitoFrito usb adapters aren't always wired the same and are only supported by specific keyboard. They were a transition technology and the keyboard would need to be able to run in either ps2 or usb mode, I doubt you'll find modern keyboards that support this. If it doesn't come in the box it's not supported. PS2 isn't any better than a quality USB keyboard. Back when keyboard first went USB they were all crap you could clearly see the difference, it was a few years before you started getting 8+ key rollover and 1000hz polling rates. These days you can't tell the difference and the benefits of USB outway PS2. However I'm still glad I have a PS2 port, I haven't used it for years but I like having the option. Also who cares if ctrl+alt+del doesn't work, your restarting your pc anyway at that point or you could just replug the usb keyboard.
@@Commander_ZiN So for games specifically requiring speed and key combinations of more than 1, is it better to use PS / 2 or USB?
Yo, I have a decent reason for using a PS/2 port: saving USB ports if you're low on them.
Valid
i am with you man thats right
Amen.
USB expansion bays
But why not _both_ ?
This Linus guy is awesome,he should make a channel named Linus tech tips
Yeah, i feel he could make an entire business outta that.
Yeah! And maybe like... hire some other guys, help others TH-camrs make like cool JARVIS type systems in their companies
he does it’s called linus drops every fucking thing and breaks it on youtube!!
Wouldnt that be amazing
Viral Dev a good idea from a very good boy
1:52 didn't see that coming haha
I play old games on a nuclear reactor so i don't need to worry about latency
Jj BB i have a 1 core 2 ghz and 512 mb ram with 400 clock speed with a asus something gpu with 256 mb vram. I play gta vii, witcher 5, fallout 13 old vegas and half life 3 with extra high settings. I think im going to sell it to nasa they said it was a super computer and they want to pay 10000billion bitcoins.
Also latency doesnt even exist on it
Oh good.
keep dat boi cool
That would be pb for 'petabyte'
Most of those downsides wouldn't affect me as i never unplug my mouse or keyboard unless they are having an issue.
5:37
Linus: *winks*
Me: He knows!
Idrees Ahmad
34 zettabyte of 8k 480fps 2048 bit audio hentai with 200+ backup servers around the world all transferring file via the tor network plus alien grade encryption
Then I suppose you should get tunnelbear
Lol
Lmfaoooo
I did actually bend one of those pins on one of my PS/2 keyboards
I did that too and it still works fine without the pin only thing i cannot press more then 4 keys at once
PS/2 connections are also BAE for troubleshooting. Like Linus stated, PS/2 can be recognized as soon as the computer is powered on unlike USB where the USB-Controller has to be loaded.
But yes, it is also annoying not being able to hot swap...
Pros and cons to everything in life really.
PS/2 devices can be hot-swapped, just not all the time. I've experienced times when doing so causes the keyboard or mouse to not be recognized until you reboot, but instances of it causing damage are very rare. And a lot of times you can get away with it with no problems.
VWestlife careful, VW, saying that kind of thing is liable the get a $user to break something.
usually you can buy PS/2 splitters, but sometimes said splitters are unreliable.
Officially not hot swappable, but rarely causes any problems if you do. If it was plugged in and already recognized at boot time, then most of the time you can unplug and replug without reboot.
Linus wants to kill his audience with dad jokes.
i luled
Well, he _is_ a dad.
thats no excuse...
So puns are called dad jokes nowadays.
^Duck Only very bad puns.
“VPNs are hard to use”
Uhhhh. I was overseas for 4 years, used countless VPNs, including tunnelbear, which was complete shit, and none of them were more complicated than simply pressing the “on” button.
Major oof
Well at least LTT dumped tunnelbear
I use turbo vpn
@@Ultimateharen I really like ExpressVPN myself.
They used to be. Before you had to type in the ip and manual connect. But that hasn't been true since like 2012?
@@danielhebard1865 me too. It worked in China. That's all that matters to me
Some older motherboards (5-8 years old) won't let you into the bios because the USB keyboard input isn't recognized initially. PS/2 is then the only way to get the computer into the BIOS setup. Always good to have a PS/2 keyboard available for that if you service older machines.
Ps2 mice and keyboards have saved my butt many times when Windows 10 decided it didn't want to recognize their USB counterparts anymore.
Lawrence Lentini fr ? WTH were you using bc that sounds damn near impossible
31337 Clan Certain emulators, dual booting and other stuff I do can cause you to have driver glitches with Windows 10 and when that happens you can't use USB mice or keyboards that require drivers.
What are you talking about? I've used Windows 10 since its release and it has never rejected my keyboard or mouse or had problems with connectivity or response. I hate Microsuck as much as anyone but ironically, the connectivity has never been an issue for me.
I do weird things with Linux and emulators that Windows 10 doesn't like, it really isn't a big deal though because it's easily fixed with a Ps2 keyboard. My main problem with windows 10 is the constant forced updates that change my settings and always seem to make something stop working.
Same here, the forced update made my bios got glitch regarding USB ports
Im using a USB to PS/2 adapter just to save a USB port because I only have 2 ._.
Wouldn't it of been better to use a USB hub and get more ports rather then save just one by paying money for a adapter? No sense...
Krytern UK decent powered usb hub = $20. Usb to ps2 adapter = $0.5 (or free since most have one somewhere).
Do you still get nkey rollover this way?
Damian Anlauf Using an adapter means that you get the worst of both worlds, so I'd guess not.
qwertyuiopzxcfgh I'm not so sure because considering how PS/2 works, a USB to PS/2 adapter should not work at all, at least not a passive one.
Ps/2 will always be useful for PC repair because sometimes the BIOS only wants to respond to a PS/2 keyboard
1:53 My ears… 😂😂
Violet = Keyboard
Green = Mouse
tris Do you have a PS/2 port where I can plug my tool? If not, I think we are incompatible.
PM Salvo: Or not, this was true on especially old devices, but "recent" (2000+) motherboard are fine if you switch them.
Tom F Wow, I didn't had that when I had a PC back in 2003. Do you know if the ports are still colored green and purple? Because it would be weird if they still color coded the ports if they are interchangeable.
Mine only has one port and the it is colored half green and half purple.
ZNemerald on most modern boards its just a solid colour and can be used for the keyboard or mice
He doesn't even mention the biggest reason that i use a PS2 keyboard: i can boot up my PC from being shut down (not sleeping) by pressing a key (PS2 BIOS option).
Yeah.... USB can do that too though.
No. I'm not talking about any kind of sleep or hibernation, I'm talking about Shut Down (fast startup can also be turned off). I've never seen an option for USB to do this.
I have a always on option for USB in my BIOS. I can turn on pc by a keyboard press from a shut down state
and how do u do that shit
USB Can do that too from shutdown. It's an option in BIOS as long as your computer detects that the USB device is a keyboard
Also interesting to know: Extreme Overclockers prefer the PS/2 Interface, because USB tends to stop working at very low temperatures
I had an old PS/2 KVM switch so that I could access all my PCs (servers) from a single console. It became increasingly more difficult to find motherboards with PS2 ports and so I turned to USB to PS/2 adapters. That was a nightmare - you never knew when the system would stop recognizing the devices. So I broke down and bought a USB KVM switch and, except for a slight bit of latency between switching from one computer to another, it works well. Also, Tunnelbear does not support Torrent software, making it almost worthless.
"Having my D key pushed down".... dang dude, thats deep
*deep*
Lmao
The good about PS/2 is that you don't use the USB, so if you have not so much USB Ports, you use the PS/2 the problem is: Don't have in Laptop's.
And laptops, are where the USB problem starts.
If you really are that desperate, a small USB hub would work.
This is legit , especially lately , when every mobile device moves to less and less ports .
Get a laptop with 3 USB ports. 3 aren't enough for you ??? Get a gadget that makes more USB portes from 1.
I have a usb hub so it isnt a problem ;)
3 is just enough ports for me, but if I ever wanted to connect another thing to a port I'll need to swap something out. I usually don't need more than three but if I do it's an annoyance.
Another downside to PS/2 interfaces is that they talk at around 10kbps, so you're going to get delay from the data transfer instead of the polling delay.
to be fair you don’t need that much bandwidth for a keyboard
10000 bytes per second, just to send a single byte signal. that's 10k operations per second.
if we convert that to milliseconds, that's 10 operations a millisecond (aka 0,1 milliseconds per operation). my monitor refreshes every 2.4 milliseconds.
I think I can handle a 0,1 millisecond operation, by the time my screen has refreshed i could have pressed 24 keys, at least if i was from X-Men.
PS2 isn't superior at all. It is the same than usb 1.0 only if you push one key at a time, but if there are more more keys pressed, it's always worse. This is because one USB 1.0 packet takes equal time to transmit as one PS2 packet, but the ps2 packets only hold one key on/off command, and the USB ones hold up to 6 key states plus the ALT/SHIFT/CTRL/WINDOWS states (left and right ones), totalling 12 keys. (and that's just usb 1.0, it gets faster on the later versions.)
Also, on PS2 , the message of a key release , takes twice the time than the message of pressing a key.
The lack of speed is by far more important than any other usb latency problem.
I used as reference Ben Eater's video "The USB Protocol"
@@JackPorter 10Kbps is 10,000 Bytes per second now? No, 10KBps would be 10,000 Bytes per second (notice the b vs B, bit vs Byte, seems like a small difference but it matters here :P)
PS/2 doesn't just send a keystroke, it sends a scancode. Each key press generates a scancode, each key release also generates a scancode. Most keys have a 1 Byte scancode generating around 10 bits of data, some keys have a 2 Byte scancode.
So in reality the bandwidth isn't 10,000 keys per second but more like 600-700, which still seems higher than a human would type but isn't anything special in terms of speed.
Btw, your monitor doesn't refresh every 2.4 milliseconds, or it would have a 461.7Hz refreshrate, many times higher than even the best HDMI standard can handle.
When linus said “Well hold on” the video started buffering and still is XD
0:35 thats some ugly keyboard u got there
th-cam.com/video/Kpnd4OVf7oo/w-d-xo.html
It's like Lil Jon had grillz installed on the keyboard, and then somebody vomited on it.
I mean to me it looks pretty nice its probs just the camera that made it look worse like the flickering lights
give it to lil pump that ugly keyboard
get it? hahah
my school uses all ps2 keyboards
The students at my old middle school use to unplug the keyboards and mice. The IT guys were always in alcoves
Broken Bucket Yeah same at my old school too.
Francisco Santos maybe.....😂
My ps2 keyboard uses all schools
My uses school all ps/2 keyboards.
you can even use the PS/2 keyboard to power on the computer when it's off, by pressing a certain key or key combination, depending on the motherboard BIOS settings, which saves me from having to reach to my desktop to press the power key, when I can just simply press Right Alt + Print Screen key to power it on
Well you cannot use them no more as PS/2 don't exist anymore hence that is why all modern day devices use USB as USB is much more durable and robust
3:28 now thats a lot of damage
FLEX TAPE!!!
How about a little more? BUCKET
So USB is the computer equivalent of Isabella from Phineas & Ferb?
Darian Mccants I see what you did there
Darian Mccants I don't. What
Explaining the joke makes it not funny anymore:
Isabella is one of the main characters from Phineas & Ferb. Most episodes have her ask the protagonist the question "What are you doing?" and the answer is usually something unusual.
Micky strange to find a Russian time here
actually usb stands for usabella 2.0 or usabella 3.0 which is a lot more annoying
From what I've read, since USB 3.0 has full-duplex, that allows hardware interrupts again as well if it's implemented correctly in the keyboard
Thank you, Techquickie!!! I just saw this video and it explains a recent phenomenon with my PC--my USB keyboard has been shutting down (and not waking up) after inactivity during the day (my USB mouse connection seems immune to this issue). After much Internet searching I discovered that USB connections are subject to Win 10 power settings. But this video went further by highlighting what is actually happening when the PC turns off inactive USB peripherals. I am going back to PS/2 connections!!
Long time ago, my friend had usb to ps2 converter. His old pc none any usb port. He tried thumbdrive with that connverter. Never heard of him since.
So he plugged a USB drive through a PS/2 port??
@large monke No he transcended time and space and gets transferred into the cyber land.
It used to make a difference, when processors were slower, and so many things used USB & competed for its bandwidth. I gave up on PS\2, when it stopped offering a performance advantage & actually seemed to hinder performance. The baud rate is limited on PS\2.
Psh ps/2 is cool... but only if you have a mouse with balls!
my mouse is neutered, more cyborg, lazers, ect, but soon ill reinstall his balls, with logitech brand trackballs, 100% ready to take on the track and field sports
Ball mice suck. You have to keep cleaning them and they keep on dying on me. laser mice are much more reliable.
geo58impala Optical mice are even better
I only use optical mice if I can.
Isn't laser mice the same thing as optical mice?
In my experience, in a data center environment, PS2 style keyboards and mice work more reliably with KVM switches than USB ones do.
That's false
USB devices are 100% better than the outdated PS/2 DEVICES
@@stephensnell5707 And yet, switching USB keyboard and mouse over a KVM switch is usually unreliable. We're not even talking about the cheap KVM switches people have at home, we're talking >$3500 KVM switches with RJ45 (not ethernet) cabling and they still often drop the mouse or keyboard connection when switching...
PS/2 has never had that issue so in most deployments we still use PS/2, even though technically it is inferior, switching USB between computers was never intended and as such, rarely works stable.
I've been using the same IBM keyboard for 20+years via ps/2 connection. It's just a good keyboard. It's comfortable and I can rest my hand on it without accidentally pressing and unwanted keys. Idk, it just feels right.
Can one port to rule them all ever exist?
TheBodyOnPC USB C
Justin Noker Nope...,That would be either USB or the Antenna socket on the back of any TV. Good luck using type c to watch tv or finding type c sticks.
Plus a type A would fit on most phones had they made them half a centemeter thicker.
Doesn't offer the security and compatibility of PS/2.
Roman Bukins ... It's not yet but usb c will be the next thing unless something else comes out
Coaxial
This comment was typed on a PS/2 keyboard
Jorno this comment was typed on an iPhone touch screen
This comment was typed on a toilet seat.
i used a ps/2 keyboard for years that was made for windows 2000, it was warped, and years later the top row of numbers stopped working but it was definitely "ole faithful" for anything that needed repaired
Jorno This comment wasn't typed, I used voice to text.
This comment was typed on a touchscreen
I'm actually glad that 6 years later - they are still putting a combined keyb/mouse ps/2 port on motherboards because I like old tech and I like to use new old stock input devices on my modern computer. It's especially useful for vintage mechanical keyboard enjoyers but I like a few different membrane boards from back in the day as well as my mechanicals. You can get some good quality serial/ps/2 to USB adapters these days but it's just satisfying to use it the way it was intended 15-30 years after it was made.
USB is for modern systems and with USB legacy enable in the mainboard bios it works for older operating systems with DOS mouse driver like the Cutemouse-driver too.
PS/2 ports are also more secure than usb ports
Patrick Neary explain
what do you mean by "secure" ?
James TheGamer usb devices need to have signed drivers associated with them when connected.
You can inject malware or tell a system to get fake drivers which can then grab viruses and such.
Which is why you should never use a USB key that you found on the ground.
Usb ports can be used for other things such as flash drives so things that have a USB port can put unwanted files onto your computer. Ps/2 ports will not allow files to be transferred. This is why IT workers and government buildings will use ps/2
There always is a workaround. You could just emulate a PS2 keyboard, and your done.
This is like BasUSB but with ps2
edit: so if you're afraid of USB ports, then better not use computers at all :b
We only have an old NEC Windows 95 keyboard and an old Compaq mouse that came from a 5100 or something. The funny thing is this is all being used on a Windows 7 computer. I still like it though.
Creeper 34lol your keyboard should be worth a few hundred
Windows 7 4 life.
@@TheSpiritOfTheWest I was given a Win 95 NEC "complete system" than was used for 4 hours & put away. I recycled the Keyboard/Mouse/CPU but kept his acc. 'bullet proof" HP Deskjet932C Printer & 14" CRT Monitor. I also had a German built Keyboard but it took too much Desk space.
One thing that I love about PS/2 is that you don’t have to use up any of your USB ports and having to buy adapters for more of them to get more extensions or accessories.
Your reference to the advantages that PS/2 can give you when you are having boot problems -- this is SPOT ON. I realized this the first time I upgraded my Linux OpenSUSE Tumbleweed and it didn't want to recognize any USB keyboards I plugged in. It was time to return to PS/2.
And yes, I am also an IT guy. :-) Sometimes, simpler is better.
I can Turn On my PC using PS/2 Keyboard...
James Valentine how?
Great for you, I can do the same with an USB keyboard using my UEFI mainboard.
It's nothing special
Same
I can turn on my pc just by opening my trench coat.
I can turn on my PC just by looking at it
...and then pushing the power button
Model-M user here. You will pry the beige clicky keys from my cold dead hands.
Same here. The Model M is just awesome!
Sgt Moose, Dam near governmental intervention up on old fabulous tech!.
I would rather drop dead than be forced to throw away my rubber ball mouse.
I wish I had a model M but I do have an old gateway clone that's awesome
I have an active PS2 to USB converter since half of my hardware doesn't have PS2 ports.
(this thing : www.amazon.com/Sewell-Active-Adapter-Keyboard-Mouse/dp/B008J56RVY )
A company called Unicomp, Inc., still produces the model M from IBM's original tooling. They also make a USB version.
@4:50 I wish I still had mine... That's what I played wc3 on love those older keyboards
Yes. Recently, I was working on creating my own USB drivers for homemade USB devices but we can't imagine the quantity of data sent over USB ports especially for keyboards and mice!
Btw, by looking at the PS/2 connector pinout, it seems that we have the same signals as I2C or unidirectionnal SPI buses! It should be interesting to make a few experiments with it. There is this interrupt controller 8259A that allows the CPU to do its own business and switch to keyboard/mouse activity whenever a PS/2 signal triggers an IRQ.
My motherboard has only one PS/2 port (half green half purple) which is strange. So someone has to choose between using it for keyboard or for mouse. As far as I know, I have never seen PS/2 wireless devices like keyb and mouse so for comfort I guess it would be easier to choose USB. Lately, the USB mice I had, demonstrated erratic behaviours (no response to moves as well as to buttons pressed) and I guess (but have no proof) that a PS/2 mouse would work better.
Regarding the other ports, I am perfectly happy with no LPT DB 25 port at all but having so electronic stuff to do every now and again, I miss the serial port DB9 a lot!
Still today, if the computer has a PS2 port. It is more reliable with keyboards when there are problems. It is still my first choice and is my tech keyboard when I'm working on other people's computers.
Also leaves more USB ports to be free and open for other devices.
The other reason why it's nicer, is trouble shooting and trying to get into BIOS. PS/2 seems to work better.
Personally, my primary keyboard was made in 1995. They don't make it like that anymore. Only two or three keyboards in the world has its much better layout. Really, it is not difficult to make a keyboard with a big backspace key and a big L shape enter key.
BenQ makes one... Finally.
4 Month late:
But what you describe is any ISO keyboard (instead of ANSI)? en.wikipedia.org/wiki/Keyboard_layout#/media/File:Physical_keyboard_layouts_comparison_ANSI_ISO_KS_ABNT_JIS.png
@Toby Henderson The Adapter I use is not just a "Plug-Plug" thing the size of a Thimble but a KVM Switch. Does both Keyboard & Mouse. I do not think a simple Non-Electronic Adapter will work.
@TexasCat99, its Ps/2 NOT Ps2. Ps2 is a gaming console NOT a computer port.
@@kalijasin Oh for christ's sake shut the fuck up
@@kalijasin stfu
Happy 30th Birthday PS/2 Port!
David Summers damn
David Summers damn, is that it, only 30? Honestly I would have guessed 35ish.
3:14
I have had the opposite issue. I am trying to use an old ps2 keyboard on my system which is an older system but not too old, and my ps/2 keyboard will work in the bios but will not show up in the bios. And the keyboard doesn’t work in windows. I am very confused by this and am looking for answers.
Sounded like 1:44 was a terrible missed chance to start singing the Cupid Shuffle
Worth noting that interrupts have significantly more 'initial' overhead than starting a polling window. Polling is generally bad practice for events that do NOT happen often, since the system will spend a lot of time waiting around for nothing, which is even worse than the interrupt overhead. However, in the case of a mouse which moves around constantly, there's arguably an advantage to polling over firing 100s of interrupts a second to the OS and waiting for the interrupt handler.
If you know that the mouse is always going to be moving (example: FPS game) you may as well check it for yourself frequently instead of waiting to be interrupted over and over again.
This holds even more truth on todays multithreaded systems. However, as a coder, I find polling aesthetically ugly. But that's a problem in my head, not the pc.
Yeah, sure, fps, but that's just only one particular use. For most uses the interrupt system should be better than polling system.
However, we are (sadly) driven by industrial efficiency, rather than user focused. So the predominant idea is to produce more computers with the simpler factory lines, which includes less different ports, if possible only one (some computers are so useless that don't even have an ethernet port)
@@alfredomartinezcaceres3936 None of this is true though, as USB's polling (even USB1.1 with its 12Mbit/s) is still faster than PS/2's interupts.
The total time USB takes to poll and process a scancode from a USB keyboard vs the time it takes a PS/2 keyboard to send its scancode using an interupt is in the range of 15-100 times faster than PS/2 (depending on USB version).
Besides that, most PS/2 ports on computers the last decade or so are just connected to the USB controller on your pc, which has a backwards compatible mode for PS/2. This means for most people that have used PS/2 keyboards the last decade or so, they do not have interupts.
For keyboards it makes sense, as it was designed for, for mice it might make less sense sending 100 or even up to 200 interrupts. I'm not knowledgeable enough to judge. Early ps/2 mice, like the microsoft scroll wheel mouse, did only send 31 interrupts and you could change to a max of 62. Later mice did 100 by default, with easy changeable to 200 in the mouse properties
im using a ps2 mouse on a ps4 with an adapter to hdmi
savage
sure you are XD
i think you're new catface
They call you Macgyver
There are free vpns that work just as well as TunnelBear
There is a timer interrupt, which I think is what makes system to query usb keyboard and mouse current state, so ints that are sent to the cpu might in fact be more efficient, let alone no latency.
Just wondering, if you used an adapter to plug a USB LED keyboard into a ps/2 slot (say, to free up a USB slot), would the lights still function? I don't know what the power functionality is.
And then there's me, still having some computers who haves a serial mouse, DIN keyboard, and LPT1 printer xD
Amen
A serial mouse?
Sir, you make me proud!
Have you tried using the COM-port for LAN?
I tried once, it took 5 minutes to send an "end turn" of Heroes of might and magic.
Xd
Same here
PS/2 is better. Why? Because when I was installing windows onto a new SSD recently, apparently I didn't have the right USB drivers, as my keyboard and mouse were totally useless.
Ever tried installing Windows without a mouse or keyboard?
I had an issue with an error log file somewhere, endlessly filling itself and creating new ones until the drive was full. CPU sat at 90%. Went for a total reinstall, drive died. New drive was perfect, but the mb didn't recognise USB devices. I had to raid the parts bin in the loft for a 20 year old PS/2 keyboard!!
Yes, on my 2014 Dell laptop. Keyboard and trackpad failed during that shitass Windows 8.1 install process. Had to use the touch screen, which functioned. Gee, I wonder what that OS was made for...
Private Custard Yes, by using a touch screen. Hee hee, hoho hahahahahahahaha *HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAA!*
You can't though with Linux you still have to option of SSH or connecting to the serial port.
All versions of windows have a addon that come with USB drivers so that doesn't happen
Where can I get a fully analog PS/2 gaming keyboard? No internal digital conversion that adds latency?!
actor: is sad about breaking his ps2 mouse
also actor: has a gaming mouse plugged in
PIFFFF PS/2.. SERIAL PORT, MASTER RACE!
REDCOW34 dam son....
REDCOW34 You're forgetting Parallel ports xD
Ohh Shitee :/
*_SERIAL NEVER DIES_*
On a serious note:
Most digital interfaces are serial nowadays
REDCOW34 shadilay brother! praise kek!
I like how he tries to cover the connector of the Mouse thinking we wouldn't notice that it was a USB Mouse with a PS/2 adaptor.... >_>
some programs, like Acronis True Image boot disk (depending on the version) will not detect a USB mouse/keyboard but works fine with a PS/2 mouse and keyboard. Also, some motherboards, for whatever reason, will not allow you to gain access to the BIOS without a PS/2 mouse. Those are the reasons I still have a PS/2 keyboard and mouse.
For GPS devices with USB connectors used today (March 24 2020) I have to use a special driver that handles the USB connection as a serial one so that my GPS receiver used for timing purposes works well.
I use ps2 cuz *my usb ports should be used for something else*
I had the a Microsoft Sidewinder Dual Strike controller when it launched in 1999 as one of the first USB only controllers. I was amazed of the nature of USB at the time and how you could attach your device without shutting the computer down. It was such amazing deal!
Yeah, I'm not turning back to times when I couldn't use up-down-left arrow keys at the same time. It work for up-down-right though. So I was only able to start drifting to right easily in Trackmania.
I once had a box that would convert IDE to LPT, very useful back in the day.
'90s throwback? More like '80s throwback -- PS/2 (as well as VGA) has been around since 1987.
VWestlife PS/2 as been around from 1987 to 1996, and that's almost entirely in the 90's.
Linus is a '90s throwback.
So by 1989 you are saying it had proliferated to a common household name? I was born in 85 and was using AT keyboard connectors and Serial mice for several years in the 90's as not everyone could afford the latest shit. By the time USB came around I was probably using all 4 standards depending on whose stuff I was working on (playing with too lol).
Most businesses and government are dual monitor these days so it's a huge amount of VGA & DVI together. But DisplayPort is making a huge presence. Most Dell mini desktops have DP and ship with DP to DVI adapters. Even their older docks are dual DVI/DP. The newer Lenovo & HP docks are often Dual DP with 1 VGA but it varies a lot.
VWestlife It's brilliant always seeing you around TH-cam.
USB is a bus! The more USB devices on it, the slower it gets. You can't get into some BIOS's with a USB keyboard. PS/2 rules!
Kev G sir what year do you think it is
@@nasc1333 2019, and I am still rocking my old PS/2 compaq keyboard!
(Its like 19-21 years old)
PS/2 masterrace represent!
o/
All your ports are belong to us!
@Tiny Metal Tube USB is for more than just HID, imagine what happens to the shared bus when you're cruising through an external drive (as an example, doing routine backups) or a webcam for streaming. Those high bandwidth devices running full steam will choke out nearly all other devices or more likely be throttled by the hub and suffer loss in performance. It's a /universal/ serial bus, not just a slot to stick overpriced flashing RGB keyboards into.
It's bad to tell people there really isn't a need to consider PS/2 over USB when there are very clear and important advantages to reviving the work-horse protocol, and as someone who has had to work with USB hardware I absolutely despise how cluttered and bloated the whole thing is from the chips all the way to the kernel USB stack; dealing with it makes everything slower and particularly affects mobile and embedded devices badly (don't forget the use case of USB isn't limited to desktops with enough cycles to make it imperceptible under normal loads).
PS/2 certainly had issues, but USB took it all and made it suck then suck faster, and now it sucks fast at much higher amperage for extra fun. I can't wait to see how many OEM PSUs fail when the charging ports proliferate on prebuilts and laptops that should never have them and some cheap device actually tries to pull 2.5 or 5A out of a common Dell or HP. (For even more fun, imagine what all that rippling on the USB power rails is and/or can do to all the devices on the bus!)
@@ElenraiSame here only HP PS2 Keyboard & Tracking Ball Mouse, & 1995/96 HP Pavilion Monitor w/ built-in Amplified Loudspeakers. Used everyday, no issues. I also have a Gen 2 Microsoft Mouse. It's kinda slow, but still works without issue.
@@bradsmith1934 man you made me remember my old Logitech mouse, I wonder if modern trackballs exist...
4:45 This is an AT Model M 1390131 keyboard. Didn't come with a PS/2 cable, but rather the older big black 5 pin plug. Those plugs used to be standard on motherboards before PS/2 ones up until the mid '90s, like up until the Pentiums took over. Many a classic 486 these days for retro rigs. But I digress. Since it's an AT at least and not an XT, you could probably just swap out the cable for a PS/2, if you wanted.
The big 5 pin connector 'DIN' is the normal variant, PS/2 uses a 6 pin 'mini DIN' connector. They use the same PS/2 protocol, the only reason the smaller mini-DIN has 6 pins is to (optionally) combine both the mouse and keyboard signals into a single connector with some motherboards. By default both DIN and Mini-DIN PS/2 connectors only use 4 of their pins.
1:52 I love it when Linus does those things 😂
3:30 when Linus gets too excited and smiles a lot you know he's gonna change his mind and say hold on
This comment was typed on my IBM PS2 Model M mechanical keyboard on Windows Vista Ultimate SP2, and a TinyTech PS2 mouse.
Those ps/2 port look badass and colorful
This reply was typed on my IBM PS/2 Model M mechanical keyboard. We are more numerous than people think. :D
I was with you until "Vista." Why
I still have a M$ bus mouse card and mouse, worked last time I tried it years ago, I just can't find a mobo with an ISA slot any more to plug it into.
Bro, I have a DIM port keyboard, can I connect an adapter to ps2 entry to make it work?
Wow-brought back some memories talking about IRQ and showing those ports. the old days of manual configuration on some of them.
good info and may look at the VPN soliton
Make a gasoline powered PC build! Motor must be in case.
David Summers Yeah, but make it V8. Because everything is better with a V8.
Do you know how computers work?
Oliver Kavanagh on electricity?
I once powered a pc with a diesel generator to play some music on a beach party. Is that close enough, or does it really have to be gasoline?
Oliver Kavanagh do you know how alternators work?
Nobody seemed to mention the biggest PS/2 win of all. You don't waste your USB ports on a shitty mouse and keyboard.
TRUE
I've recently run into those USB compatibility issues when upgrading my PC and building a new one for my wife. I had to try a handful of USB keyboards before finding one that the BIOS would see. The next step would have been to dig out a PS/2 model from the technology graveyard.
2:45 where is the delete key
It deleted itself
I recently got my hands on an old Model M keyboard for free... It was gonna get thrown away at my University... So I snatched it :P
Rourke Hikari Wow. Score.
They are too expensive for my liking, good find!
4:10 he still has the tag on the hat lol
I'm currently using a DIN to PS/2 converter :) gotta love those old school clicky keys
Usb3 specification now includes some way of sending interrupts.
USB always "has" (Well, not 100% sure on some early 1 versions.) It's not really an interrupt though as in having the CPU jump to the interrupt handler. More of a reduce the latency thing.
Basically what an interrupt does in USB land is to make the host request data from the client in one of the frames. Which are 1 millisecond (1000 us). USB 2 introduced and 3 keeps microframes which are 125 microseconds (125us). So a USB "interrupt" will cause it to issue a request to the client, which will then send it, when it schedules it. Ideally this should be the first packet, but there can be other interrupts, and I think isochronous (which is reserved blocks) can also bump that, ignoring that for the moment (as I can't 100% recall what the spec says). I don't think it has to be scheduled first either. It can request anything from 1*125us to 15*125us. (Note: Host not required to give it to them.) If the data is particularly small it might fit into the interrupt packet, in which case it doesn't need to be scheduled, but still has to wait for the next (micro)frame. (Up to 1000/125 us)
It's also why for any sort of real time, in the us range, something like a microcontroller or fpga is highly preferred. Even the old fashioned ECP port's latency is several orders of magnitude better, the port's latency is .4us (400ns) for a byte. Which is why for things like CNC it can be used but USB can't directly be. (At least not fast or without a smart device like a microcontroller or fpga on the other end.)
For a keyboard? Frankly Millisecond is fine for pretty much anyone. Same thing for a mouse. Maybe Data would have an issue with that. How fast can people process and react? It kinda depends, but given that (very simplified) visual perception seems to be limited in even the edge cases to ~250 Hz or 4 milliseconds, 4000us, or 4-32x longer than USB would generally take.)
For the cited example of CNC. It matters. You are giving it steps and if it hit something it shouldn't (ideally a limit switch) you want it to shut down *now*. Unless you like bad things happening, like ruining things which cost from tens to tens of thousands of dollars (or more) to fix, and possibly sending (also expensive) shards of metal flying out at very high speed. (Mind you, that'd likely have at least a microcontroller on the other side of the USB connection.)
(Note that there's additional overhead for processing, and transfers be they ancient 8-bit ISA, PCI, PCI-Express, USB setup, or other processing. Which if you care that much about things, you probably have a reason to. Same for the note on visual, ignores, the brain processing (which per an MIT study I ran across it had people only processing the image if it was persistent for more than 13ms which is ~75 Hz (but there's edge cases there, where in a dark image, a flash of something for a very short period can be seen.))
What if you connect a USB mouse via usb to ps2 converter
/Music plays
Jack Bernard I'm curious someone please tell
it works.. but the hz goes down but the interupts gives you a smoother more responsive mouse (should) works with keyboard too -just plug ps2 green to green and blue to blue
Ye i know. It would be wierd
sooo in the end is it watcha doin or im doing this response?
It has always worked for me, and a old mircosoft ps2 wheelmouse was my first fpsshootermouse , I dont know how usb hz converts to ps2 75 hz default. You should be able? to crank up the hz (interrupts?) manually (not shure for windows 10 - last used that method in win 95 to win Me)
He said "Long live PS/2
I said "Yes, long live PS2
The Phoenix long live both :D I still have two working ps2s and a ton of keyboards and mice. One ps2 is for the back of the car and the other for at home
I was here researching to buy a new keyboard. This video made me realise my old one isn't broken after all, I just didn't realise you can't hot-swap PS/2 and often put my PC to sleep instead of a full shutdown/restart.
I totally forgot about this phase Linus went through- where each sentence was delivered like he was presenting closing points of a TED talk- but it was throughout the ENTIRE video