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#1
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USB2 to PS2 adaptors?
Mon Jan 14 14:25:37 SAST 2013
I've got a USB keyboard which was OK on a netbook, which has now been stolen. And I've been using a USB-to-PS2 small adaptor for my mouse. So both items tested are OK. I'm trying to test a mother-board which tests ok with a PS2 keyboard, by using the USB-keyboard via the same USB-to-PS2 adaptor. Why does the mother board NOT detect the USB-keyboard via the USB-to-PS2 adaptor? I'm guessing that PS2 is NOT an electrical/protocol standard. It's just a mechanical standard. And probably the USB mouse also just uses a primitive non-full-usb protocol. So then, did the netbook have the ability to detect a fake-USB keyboard/mouse ? == TIA. |
#2
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USB2 to PS2 adaptors?
wrote in message ... Mon Jan 14 14:25:37 SAST 2013 I've got a USB keyboard which was OK on a netbook, which has now been stolen. And I've been using a USB-to-PS2 small adaptor for my mouse. So both items tested are OK. I'm trying to test a mother-board which tests ok with a PS2 keyboard, by using the USB-keyboard via the same USB-to-PS2 adaptor. Why does the mother board NOT detect the USB-keyboard via the USB-to-PS2 adaptor? Mouse and Keyboard adaptors are different the adaptor should be marked |
#3
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USB2 to PS2 adaptors?
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#4
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USB2 to PS2 adaptors?
philo wrote:
wrote in message ... Mon Jan 14 14:25:37 SAST 2013 I've got a USB keyboard which was OK on a netbook, which has now been stolen. And I've been using a USB-to-PS2 small adaptor for my mouse. So both items tested are OK. I'm trying to test a mother-board which tests ok with a PS2 keyboard, by using the USB-keyboard via the same USB-to-PS2 adaptor. Why does the mother board NOT detect the USB-keyboard via the USB-to-PS2 adaptor? Mouse and Keyboard adaptors are different the adaptor should be marked I have a usb to ps2 adaptor in my hand right now and it has a mouse symbol on it. Why do you think that is? |
#5
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USB2 to PS2 adaptors?
In article , "philo" wrote:
wrote in message ... Mon Jan 14 14:25:37 SAST 2013 I've got a USB keyboard which was OK on a netbook, which has now been stolen. And I've been using a USB-to-PS2 small adaptor for my mouse. So both items tested are OK. I'm trying to test a mother-board which tests ok with a PS2 keyboard, by using the USB-keyboard via the same USB-to-PS2 adaptor. Why does the mother board NOT detect the USB-keyboard via the USB-to-PS2 adaptor? Mouse and Keyboard adaptors are different the adaptor should be marked It's marked 'CHINA'; but being green tells all. Pen wrote:- I suspect that the mouse was USB/PS2 compatible. The small adapters have no parts in them so the mouse or keyboard has to be labeled PS2/USB compatible as the protocols are different. . It's unlikely that a USB-mouse is especially PSU compatible. Probably the USB-mouse protocol, just copied the existing PS2, so that a plain passive adaptor could fake it. Now the USB keybrd runs, but I haven't got time, before overheating to test the mouse. BTW. the system shuts down after 1 minute, with this unconfirmed PSU and inadequate CPU cooling. Is it the CPU or the PSU which initiates the shutdown ? == TIA. |
#6
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USB2 to PS2 adaptors?
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#7
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USB2 to PS2 adaptors?
Pen wrote:
On 1/15/2013 7:04 AM, wrote: In article , "philo" wrote: wrote in message ... Mon Jan 14 14:25:37 SAST 2013 I've got a USB keyboard which was OK on a netbook, which has now been stolen. And I've been using a USB-to-PS2 small adaptor for my mouse. So both items tested are OK. I'm trying to test a mother-board which tests ok with a PS2 keyboard, by using the USB-keyboard via the same USB-to-PS2 adaptor. Why does the mother board NOT detect the USB-keyboard via the USB-to-PS2 adaptor? Mouse and Keyboard adaptors are different the adaptor should be marked It's marked 'CHINA'; but being green tells all. Pen wrote:- I suspect that the mouse was USB/PS2 compatible. The small adapters have no parts in them so the mouse or keyboard has to be labeled PS2/USB compatible as the protocols are different. . It's unlikely that a USB-mouse is especially PSU compatible. Probably the USB-mouse protocol, just copied the existing PS2, so that a plain passive adaptor could fake it. Now the USB keybrd runs, but I haven't got time, before overheating to test the mouse. BTW. the system shuts down after 1 minute, with this unconfirmed PSU and inadequate CPU cooling. Is it the CPU or the PSU which initiates the shutdown ? == TIA. You have your facts wrong about the USB/PS2 situation. A mouse can be dual protocol. You can design the four wire interface on a mouse, such that it can sense the difference between USB and PS/2. USB for example, senses what is there via strap resistors. PS/2, as far as I know, pulls clock and data high, except when signaling is going on. When a mouse supports dual protocols, it comes with the passive turquoise adapter in the box. My mouse comes with one of these. My mouse supports both USB and PS/2, and I plug on this adapter when connecting to a PS/2 computer. A mouse does not have to be dual protocol, and some USB mice will be USB only. Plugging one of these on, will do nothing for such a USB-only mouse. http://www.aquamoontrading.com/EB/ad...sbps2/show.jpg That adapter does not have a chip inside. Instead, it simply passes the correct USB (4 pin side) to PS/2 DIN (6 pin side). http://pinouts.ru/InputCables/usb_ps...e_pinout.shtml The USB DATA- pin, functions as PS/2 Data (DIN, Pin 1) The USB DATA+ pin, functions as PS/2 Clock (DIN, Pin 5) The choice of Pin 1 and Pin 5, correspond to the first table on this page. http://www.allpinouts.org/index.php/...Keyboard_(PS/2) When a checked the 875P reference schematic from Intel, the mouse PS/2 and keyboard PS/2, have the same pinout. So Data on Pin 1, and Clock on Pin 5. (Go to PDF page 70 for a look... File is 25281202.pdf) http://developer.intel.com/design/ch...ics/252812.htm ******* This, on the other hand, is an active adapter. It converts PS/2 only keyboards or mice, to work with a USB only computer. So when your motherboard lacks PS/2 connectors, and you don't have a dual protocol mouse, you buy one of these so you can use your older PS/2 keyboard and PS/2 mouse. http://images10.newegg.com/NeweggIma...196-347-02.jpg The "blob" in the middle of the cable, contains an 8 bit processor with its own firmware, and that is how mouse/keyboard protocol is converted to USB packets. Paul |
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