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  • Adesso ADP-PU21 - PS/2 to USB Adapter, connects 2 PS/2 connectors to 1...
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Customer reviews

4.2 out of 5 stars
4.2 out of 5
363 global ratings
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Adesso ADP-PU21 - PS/2 to USB Adapter, connects 2 PS/2 connectors to 1 USB port/hub,Black

Adesso ADP-PU21 - PS/2 to USB Adapter, connects 2 PS/2 connectors to 1 USB port/hub,Black

byAdesso
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Top positive review

Positive reviews›
amazon customer
5.0 out of 5 starsWorks with Gateway AnyKey keyboard
Reviewed in the United States on February 9, 2013
Hours of research on the web and days of experimentation with two new 64-bit Win 7 computers and twenty-year-old Gateway Anykey keyboards lead me to this conclusion: Unless you bought the PS/2-USB adapter or converter with the keyboard, finding one that works with your old keyboard is a trial-and-error process. The good news is that they are not expensive.

The consensus seems to be that simple adapters do not work. I wouldn't know, as I don't own one. I bought the Ziotek "blue cube" converter recommended and sold by [...]. It did not work very well with my treasured AnyKey keyboards (this has nothing to do with their programmability, by the way). In a test repeatedly typing about 250 words, from twelve to fifteen words had missing letters. The error rate was highly variable, and from time to time it would go crazy, spitting out gibberish. Unintentional repeats, all caps when the caps lock was not on, and more. The computers themselves were also acting up, with improper boots etc.

Microsoft's web site has a little demo that allows you to test whether your keyboard blocks certain letters when you quickly press a combination of letters. This is important for gamers (not me) and fast typists (me). I found that, like most keyboards, my AnyKey keyboards do that. It appears to me that the downfall of the blue cube in my case was that they were not talking back to the keyboard to quickly reset it after it blocked certain keys.

After reading the reviews here I bought the Adesso converter and all is well. No more skipped letters or other errors, other than my sloppy typing. Both computers have settled down also, which leads me to think that maybe the "wrong" converter can interfere with more than your keyboard.
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One person found this helpful

Top critical review

Critical reviews›
JWCPA
3.0 out of 5 starsGood Quality PS/2 - USB Adapter
Reviewed in the United States on May 15, 2014
Went through several cheap versions of this type of adapter costing a few dollars, purchased off eBay and shipped from Asia, all of they died within some months. Finally got this Adesso PS/2 - USB Adapter (ADP-PU21) from Amazon Jan 2008, and it worked without any major problems in connecting my PS/2 mouse and my old but great IBM PS/2 keyboard to one of my laptop's few USB ports.

The only minor issue that may or may not be associated with this adapter and my Dell Vostro 1500 WinXP/SP3 Home Edition laptop is that ocassionally after a Windows update or use of another OS boot (e.g. UBCD4Win) from a flash drive, the next Windows boot to the logon screen had a problem if one does not enter a password to logon within ca. 15 min. Although the mouse works, clicking on the account icon does not open the password enter box. Have not been able to determine why this happens, but what seem to solve the problem is to power-off, reboot to the logon screen and logon immediately, then use Nirsoft's USBDeview free utility to delete (uninstall) all instances of the adapter/ keyboard,/mouse, use the laptop touch pad to reboot Windows again. Upon reboot, the adapter is functional again along with the keyboard and mouse, and the Windows limited logon time window is gone (at least until next time...)
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From the United States

amazon customer
5.0 out of 5 stars Works with Gateway AnyKey keyboard
Reviewed in the United States on February 9, 2013
Verified Purchase
Hours of research on the web and days of experimentation with two new 64-bit Win 7 computers and twenty-year-old Gateway Anykey keyboards lead me to this conclusion: Unless you bought the PS/2-USB adapter or converter with the keyboard, finding one that works with your old keyboard is a trial-and-error process. The good news is that they are not expensive.

The consensus seems to be that simple adapters do not work. I wouldn't know, as I don't own one. I bought the Ziotek "blue cube" converter recommended and sold by [...]. It did not work very well with my treasured AnyKey keyboards (this has nothing to do with their programmability, by the way). In a test repeatedly typing about 250 words, from twelve to fifteen words had missing letters. The error rate was highly variable, and from time to time it would go crazy, spitting out gibberish. Unintentional repeats, all caps when the caps lock was not on, and more. The computers themselves were also acting up, with improper boots etc.

Microsoft's web site has a little demo that allows you to test whether your keyboard blocks certain letters when you quickly press a combination of letters. This is important for gamers (not me) and fast typists (me). I found that, like most keyboards, my AnyKey keyboards do that. It appears to me that the downfall of the blue cube in my case was that they were not talking back to the keyboard to quickly reset it after it blocked certain keys.

After reading the reviews here I bought the Adesso converter and all is well. No more skipped letters or other errors, other than my sloppy typing. Both computers have settled down also, which leads me to think that maybe the "wrong" converter can interfere with more than your keyboard.
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Russell G.
5.0 out of 5 stars Perfect for AnyKey keyboard
Reviewed in the United States on September 26, 2021
Verified Purchase
I have an old AnyKey keyboard with a PS/2 plug that doesn't work well with most USB adapters. After reading another review here saying it worked with AnyKey, I was sold. It works perfectly, even for programmed keys. Note though, that the keyboard should be plugged in to the purple connector because the green one only works with a mouse.

UPDATE: After using this adapter with my old AnyKey keyboard for a couple of months, I can now say that it works ok *most* of the time. But every couple of hours, it suddenly repeats a key about 20 times, and moves the cursor up a line or two. Not a huge problem but a bit irritating having to clean up the mess it makes on my screen. I went back to a motherboard that supported PS/2 until I hear of a better USB solution for AnyKey keyboards.
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R. Guilmette
5.0 out of 5 stars Yessssssssss! This one actually works with my KVM!
Reviewed in the United States on June 2, 2013
Verified Purchase
I am a cheapskate, so even while everybody else was switching over to USB for everything, I still kept my older systems that have PS/2 connectors for Keyboard & Mouse. I did however switch over to DVI for video connections, because that does really provide a significant performance advantage over the older VGA type connections. By I have multiple systems here so I went and bought an IOGEAR GCS92 2-port DVI+PS/2 KVM switch, and that has worked well for me. Recently however I purchased a Foxconn A3700 book-sized system to use as an HTPC. It works great, but in doesn't have any PS/2 ports... only USB... and I had real trouble finding anything that would allow me to hook one of the system ends of the GCS92 into the Foxconn box in such a way that _both_ the keyboard and the mouse would actually work. t is easy to find inexpensive (cheap?) PS/2 to USB adapters, but as I've learned, most of these are "passive" and although they may work if you are wiring your keyboard and mouse to them directly, they definitely do not work if try try to use them with various KVMs, in particular the GCS92. What I've learnd is that for this kind of setup you need an "active" adapter. I wasn't sure if this specific thing was "active" but it was less expensive than the other other ones that I found that are "active" (which are made by Ziotek) so I ordered one and I am pleasantly surprised to see that yes, it _does_ work perfectly with my KVM. From that fact I am inferring that this one _is_ "active", but I don't don't know for sure. All I do know is that it works just fine and I'm a happy camper.
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D. Sperber
5.0 out of 5 stars Works great with my IBM PS/2 keyboard and old PS/2 MS mouse.
Reviewed in the United States on November 15, 2012
Verified Purchase
I bought one of these to use for my mother's new Dell "slim profile" machine which has no PS/2 ports on the back and only has four USB connectors.

She is old, has a hard time seeing, and has gotten completely accustomed to "typing by feel" on the large original IBM PS/2 keyboard I got for her many years ago. She loves the large keys and touch... except that it's a PS/2 keyboard.

Based on another review here, I bought this adapter for use on her machine so that she could continue to use the IBM PS/2 keyboard. She could not even see or feel or hear the keys on the supplied Dell keyboard that came with the new machine. It worked perfectly! And she was thrilled to have her old keyboard back.

I also decided to buy one for me, just in case some day I upgraded my own desktops (I have two, both of which also have IBM PS/2 keyboards which I, too, love).

Well, here it is six months later, and I was sent a Lenovo "secure laptop" by a customer to use for a remote connection setup. I don't like laptops and wanted to use my own keyboard and mouse (along with my monitor). So I pulled out this never-yet-used PS/2-to-USB adapter I'd bought six months ago, plugged in my mouse and keyboard, plugged in the USB connector to the laptop, and watched Windows recognize the new adapter hardware and add drivers for it, and then recognize the sub-attached mouse and keyboard!

WORKS PERFECTLY!

Terrific. Five stars. A+++
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Mike
4.0 out of 5 stars Great adapter, but not very rugged.
Reviewed in the United States on December 4, 2011
Verified Purchase
I have and IBM Model M that I wanted to use with my desktop computer. I already have a cheap membrane keyboard in the ps/2 port and got this adapter so that I could keep my multimedia keys (volume, play, pause, etc.) and hotswap my Model M when I wanted to do serious typing. This adapter works great for that.

I would have given it five stars, but the box in the middle of the cord is somewhat flimsy. No one else has pointed this out, but if you're not careful with it, the plastic housing might come apart or the cables might pry it open if twisted too hard. However, if you don't want to move it around much and just plug it in and forget it, the adapter will be fine. If you want to travel with this adapter, you should be mindful of its cheap construction.

If you want something more durable, you might try this adapter instead: 
Ps/2 Keyboard & Mouse To Usb Adapter  It looks like it may be more solid. It is slightly more expensive though. I have not used it, but others claim it works with an IBM Model M. ClickyKeyboards.com also sells this item.
Customer image
Mike
4.0 out of 5 stars Great adapter, but not very rugged.
Reviewed in the United States on December 4, 2011
I have and IBM Model M that I wanted to use with my desktop computer. I already have a cheap membrane keyboard in the ps/2 port and got this adapter so that I could keep my multimedia keys (volume, play, pause, etc.) and hotswap my Model M when I wanted to do serious typing. This adapter works great for that.

I would have given it five stars, but the box in the middle of the cord is somewhat flimsy. No one else has pointed this out, but if you're not careful with it, the plastic housing might come apart or the cables might pry it open if twisted too hard. However, if you don't want to move it around much and just plug it in and forget it, the adapter will be fine. If you want to travel with this adapter, you should be mindful of its cheap construction.

If you want something more durable, you might try this adapter instead: [[ASIN:B000G7WYZG Ps/2 Keyboard & Mouse To Usb Adapter]] It looks like it may be more solid. It is slightly more expensive though. I have not used it, but others claim it works with an IBM Model M. ClickyKeyboards.com also sells this item.
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DrLogic
5.0 out of 5 stars Works wonderfully with ancient IBM Model M keyboard!!
Reviewed in the United States on February 19, 2010
Verified Purchase
I have one of the old IBM Model M keyboard from 1985, which I love. The keys have nice spacing and I like clickety sound of the keys. Plus you just can't kill these things. As I said this one has been in use for 25 YEARS!! Anyway, I had just bought a new Compaq PC which (I was unaware at the time) no longer had any PS/2 ports. It only has USB. Unfortunately, the only PS/2 to USB adapter that I had didn't work. Then after some research, I found that some adapters are only pin to pin adapters, while others actually converts the PS/2 signal to USB via some solid state electronics. In my research, it appears that 3 models of adapters appear to work for the old IBM keybords: Adesso PS/2 to USB Adapter, TRENDnet USB to PS/2 Converter TU-PS2, and PS2 Keyboard To USB Adapter by Ziotek. There may be others, but these were the only 3 to specifically address the compatibility with the old IBM Model M's, which I am currently typing on at this moment. The Ziotek apparently can take up space to cover 2 USB ports, so I ruled it out. And so, the Adesso was the cheaper of the remaining two. So far, everything is wonder, there is a God in heaven, and this old computer tech is again using his ancient keyboard with yet another new computer.
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Jane Boop
5.0 out of 5 stars Works with an older Ps2 Keyboard to Kvm Switch
Reviewed in the United States on June 4, 2010
Verified Purchase
I was worried that the Adesso PS2 to USB might not work for my older PS2 Keyboard since reading some reviews about adapters. It is working so far!
I haven't tried using three buttons at a time for anything yet. I read a review that said it didn't do so well with using a combination of keys.
It takes sometimes a couple of times of hitting a key or two to function, then again I'm not sure if it is the adapter or the TrendNet KVM switch that it is attached to??? I wonder if the KVM switch is taking awhile to switch over.
The TrendNet wifi USB is working wonderfully and no problems. It gets right online at the full speed of the G router. The usb is the N type and the router is a G type and not of the same brand. I am glad that this Usb wifi is backward compatible and will eventually enjoy an N router when the prices come down a little more!
At first setting up the KVM(Usb type,TK-209), PS2-to-Usb adapter, and usb wifi(TEW-648UB) to two different computers did not start up easily. I pressed buttons and it wouldn't recognize the keyboard on either computer. I tried to use the mouse and it wouldn't recognize it either on either computer. A few minutes later it started to recognize all. Just follow all of the instructions!
I am happy and content with all three of the purchases, Yay!
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JWCPA
3.0 out of 5 stars Good Quality PS/2 - USB Adapter
Reviewed in the United States on May 15, 2014
Verified Purchase
Went through several cheap versions of this type of adapter costing a few dollars, purchased off eBay and shipped from Asia, all of they died within some months. Finally got this Adesso PS/2 - USB Adapter (ADP-PU21) from Amazon Jan 2008, and it worked without any major problems in connecting my PS/2 mouse and my old but great IBM PS/2 keyboard to one of my laptop's few USB ports.

The only minor issue that may or may not be associated with this adapter and my Dell Vostro 1500 WinXP/SP3 Home Edition laptop is that ocassionally after a Windows update or use of another OS boot (e.g. UBCD4Win) from a flash drive, the next Windows boot to the logon screen had a problem if one does not enter a password to logon within ca. 15 min. Although the mouse works, clicking on the account icon does not open the password enter box. Have not been able to determine why this happens, but what seem to solve the problem is to power-off, reboot to the logon screen and logon immediately, then use Nirsoft's USBDeview free utility to delete (uninstall) all instances of the adapter/ keyboard,/mouse, use the laptop touch pad to reboot Windows again. Upon reboot, the adapter is functional again along with the keyboard and mouse, and the Windows limited logon time window is gone (at least until next time...)
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Raphael Avital
4.0 out of 5 stars Excellent, but a caveat
Reviewed in the United States on December 9, 2018
Verified Purchase
Works well and reliably, but anyone considering buying should be aware:
It may not allow the keyboard to show LIGHTS for NumLock and CapsLock (or scroll lock). At least it did not on my system. I have a different one that works as expected, with the proper feedback to the keyboard "lock" status lights. I wish I could give you a brand, but it's not stamped or otherwise noted. It is similar to this one, only it's white. It is similar in looks to the ones at the following Amazon links. The first one is marked "Amazon's Choice" (this week). The description on the first one includes "Supports both UHCI and OHCI specifications" -- Maybe that's what makes the difference.

https://www.amazon.com/TRADERPLUS-2-Pack-Adapter-Keyboard-Support/dp/B075T1LS3V/ref=sr_1_3?ie=UTF8&qid=1544394721&sr=8-3&keywords=usb+to+ps2+keyboard+and+mouse+adapter

https://www.amazon.com/Keyboard-Converter-Adapter-Laptop-Computer/dp/B06XC8SQQJ/ref=sr_1_6?ie=UTF8&qid=1544394721&sr=8-6&keywords=usb+to+ps2+keyboard+and+mouse+adapter
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ChiTown
1.0 out of 5 stars The one that actually works
Reviewed in the United States on December 29, 2016
Verified Purchase
For testing purposes I have an Ortek MCK-142 Pro mechanical keyboard that is a favorite throughout my office. It is an AT model with a PS-2 output. In addition, I added an IBM KB-8923 and a Dell SK-8100, both ‘pure’ PS-2 keyboards. I want to use these on a modern desktop computer with 2.0 and 3.0 USB ports. In researching for a way to do it, I realized that there is a difference between an ‘adapter’, which is only a wiring solution and a ‘converter’ that has electronics to assist in making it work. The problem is that there are many brands and items available and no real way of knowing whether any or all of them will work. So I took the proverbial bull by the horns and bought one of each to try out. This resulted in ordering 9 items for a cost of about $77, not too bad for my purposes.
I purchased: USB TO DUAL PS2 Adapter Convertor – White by SaiTech IT; Monoprice PS/2 Keyboard/Mouse to USB Converter Adapter, Black (110934); Tripp Lite USB to PS/2 Adapter - Keyboard and Mouse (B015-000); TRENDnet USB 1.1 to PS/2 Converter, TU-PS2; Adesso PS/2 to USB Adapter, connects 2 PS/2 connectors to 1 USB port/hub (ADP-PU21 ); SANOXY USB to PS/2 Adapter (this one has wires); StarTech USB to PS/2 Adapter - Keyboard and Mouse; Radio Shack PS-2 Female to USB-A Port Adapter 26-723; and SANOXY PS2 Keyboard To USB Adapter (this one is a little block).
I tried them one by one. All were recognized on the USB Device Manager as a keyboard, yet all, but one, failed to allow the keyboards to be recognized and function.
The only one that worked perfectly for all 3 keyboards was the “SANOXY PS2 Keyboard To USB Adapter” – the one that is a little block. This being Amazon, I immediately returned the other 8 and ordered a bunch of the Sanoxy's. Thought you might find my experiment helpful.SANOXY PS2 Keyboard To USB Adapter
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