...
1-never programmed 8051 famili chips before;
2-i use 89c420 because i can have them for free, they have an internal 16k eeprom bank and an already built in loader;
3-i need it WORKING fot the end of november;
What should i do then?
At this point i'll try to write the program, but be prepared to correct it since i'm sure it won't work.
If someone can write the program for me, he's the welcome! If you here know how to program this chips, i think that in 10 minutes you can write the program...

Bye.