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I was once getting crap on serial output, I even changed MAX serial interface IC but then I found poor solder job (mine...) at its RX line. Check if you have +5V and GND (pins 15 & 16) and resistance between processor's 2,3 and 12,11 of max202 (or HIN202) - should be ~1k. Pins 13 and 14 of max/hin should be connected to port RxD/TxD.
If you have processor mounted in a socket then there's old trick - take it out and bridge pins 2 with 3 in socket - you should then see echo of every sign sent with terminal to the board.
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