High Robert,
The 1.0 came about 4 years later.
But even back then in the mid to late 1980's there were still some bugs that
needed to be worked out.
But in the fall of 1999, all of those issues were addressed and dealt with.
About a year later, 2.0 was introduced.
The developers decided that, if we could make the ports work faster, then
they would be better.
My best regards.
John.
----- Original Message -----
From: "Robert doc Wright" <godfea...@wrighthere.net>
To: "PC Audio Discussion List" <pc-audio@pc-audio.org>
Sent: Monday, June 07, 2010 6:42 AM
Subject: Re: HOW USB PORTS WORK
Since you went back to 1986 where is your information comparing USB 1.0
and 2.0 and why there was a change?
----- Original Message -----
From: "DJ DOCTOR P" <djdoct...@att.net>
To: "PC audio discussion list. " <pc-audio@pc-audio.org>
Sent: Sunday, June 06, 2010 7:33 PM
Subject: HOW USB PORTS WORK
Hello all list members,
I'm gonna try to explain how your USB ports work.
And in the process of this, I'm also try to put away allot of
misconceptions and myths about it.
In 1986, the USB port was developed to transmit and receive digital
information or if you will, data from the computer to other digital
devices such as, printers scanners and fax machines.
All of these devices usually have their own power supplies.
Even though, 1.5 volts is needed to open up the data ports that are built
in to the devices, the devices themselves, aren't powered by the USB
ports.
These days, the USB ports are used to open up the data ports on memory
chips that are built in to storage devices such as, thumb drives external
hard drives and MP3 players and IPods.
As I said in an earlier post, your lab top and desk top computers have 12
volt power supplies powering them.
In some electronic equipment, there are power/currant limiting resisters
to reduce the voltage to what the engineer desires.
But inside your computers, there is a chip that does a triple job.
This chip cuts the high voltage down to what the storage devices can
handle which is, 1.5 volts in to 135 MA.
This chip also handles the transmitting and the receiving of data.
This is why we're able to transfer audio/video files to our MP3 players
and IPods.
The same thing is also true about transferring pictures from digital
cameras to our computers.
The USB port was never mint to power devices alone.
But in order to make the USB port a viable power supply, a couple of
changes will have to be made.
First, the voltage will have to be razed from 1.5 volts to pretty close
to what the computers power supply is delivering.
Next, the currant will have to be razed from 135 MA to about 1500 MA.
But if we do this, the storage devices will overload and burn out.
unless, you increase their capacity too as well.
I hope I clarified the way your USB ports work.
My best regards.
John.
To unsubscribe from this list, send a blank email to:
pc-audio-unsubscr...@pc-audio.org
To unsubscribe from this list, send a blank email to:
pc-audio-unsubscr...@pc-audio.org
To unsubscribe from this list, send a blank email to:
pc-audio-unsubscr...@pc-audio.org
