I need to create a scrolling display on an MAX 7219 dot matrix display. I found a tutorial showing software to do this using an Arduino UNO board. This works with text you type into the software. I have a text plus numbers parallel feed that went to an older display that I need to replace. I have a Parallel to USB serial converter on order. Is it possible to feed the USB input on the UNO board and somehow get this into the scrolling software to feed my display? I have been working in electronics for many years but am new to Arduino and would appreciate any help you can give in accomplishing the task described above.
Thanks
Terry1928
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First, welcome 
Hm? That's one too many..
Yes. There's a USB-Serial chip in your Arduino, through that you can have a two-way communication. I can recommend to read up on the Serial commands. There's also Examples in the IDE giving you tips, and if / when you get stuck with your code we'll help you.
I think every Arduino board will work, no need to think of only one board. There is a Tutorial here on the forum all about Serial. Other than that google is your friend.