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What are your views on the parallel port not becoming part of main boards or computers any more. Or are there components in industry or business that can only use the parallel port, so it will always be a part of our computers.
Speed: Neither offers any speed advantage over USB.
Size + cost 1: The cable connectors are larger and more expensive than those on USB molded cables.
Size + cost 2: These interfaces (connectors and support circuitry) take up space on -- and add cost to PC motherboards, but few users/devices use them any more.
If and when they disappear completely from commodity-level computers, you will still have two options: Buy an adapter card to plug into a PCI or PCIE motherboard slot, or buy an external "adapter box" to convert (for example) USB to parallel and vice-versa.
I expect both serial and parallel ports to be dropped from mother boards. But there are enough devices out that that require these that I don't see any danger of not being able to get adapter cards and USB dongles with serial and parallel ports.
Most of the problems using USB-to-parallel and USB-to-serial dongles have been solved, and this is a good solution. A lot of older software didn't permit using serial ports other than COM1 and COM2, but most software has been updated.
The fact that it is custom made for a HUGE widget manufacturer, in partnership with a HUGE computer manufacturer, with the completely new release in December 2005, rather boggles the mind.
Large numbers of users found themselves having to return awesome brand new computers, after wasting untold time with tech support, and buying more than one (unreturnable) serial interface adaptor.
This goes to show that the disappearing serial port means nothing to a vast majority of users, but can be devastating to a certain percentage.
OTOH, I just sold a secondhand computer with a freshly installed gigabit LAN card, and the buyer acted quite disappointed that it lacked a 56k modem jack... and they HAVE cable DSL!