I want to make a patch to generate simple melody. and I found [seq], I want to write the MIDI list for [seq], but...

what's the meaning as below:

0 144 60 100;
250 128 60 64;

Is "0"&"144" mean MIDI note, and "60" mean note number, 100 mean velocity, 250 mean duration?

and what is "128", "60" "64" mean in the second line? and where is tempo?

thanks a lot...

p.s. I'm really interested in MCU, such as C51. but I'm a jackeroo in C51 & PD... Can I make some patch and download to C51 or write some code in C, and download to C51, then connect PD and MCU via USB cable?

I have never used [seq] before, but some of that does look familiar.

I believe the 0 is a timer = starting at time 0.

The 144 60 100 is in fact, 144 = note on, channel 1; 60=note #; 100 = velocity.

There is no duration on the MIDI bus... you have to wait around for a note off.

The 250 is another time.
128 = note off, 60 = note #; 64 = velocity.

Note off is also conventionally sent exactly as the same note, but with a velocity of 0. This is used more often when receiving data from a keyboard in real-time.

You need to get used to reading this chart. The first two entries in this chart are used in the example you posted:
http://www.midi.org/techspecs/midimessages.php