Basic to Parallel or Serial connection?

Of course it's possible. Both. Serial is easiest, it has lots of basic support (RS-232 basic extensions). Parallel (printer port) is a bit more manual, but you can use stuff like out and in to get data on/from it.

Manuel, Serial is easiest you said can you give me a example please: for input and output and how to begin a program/ and than close the program(Serial). I will not findout the weel again, when there are people that are so very kind to give a little help!
You can find my e-mailadress under my avatar in the administration.When you need it. Thanks Frits

(edit) When I know more, than I can continue my work with what already am doing meteorological measurements to refine. That's not a 'GAME' in the air, but an improved measurement of new and easy way for me to measure and program.
And that all with MSX2 and in MSX Basic language. I do not need the hurry(speedup)in the computer, but only accuracy of the moment from the measurement in Ohm's, Volts, Speed, Temperature,Humidity,rotation,ADC,DAC,Freq,Light or samething else. (THat all with formulas, where the MSX is verry good in it)

http://www.msxvillage.fr/forum/topic.php?id=738

see this interface you can mesure light temperature and sound and use basic instruction

Paraller port is the most easy one, but it is output only:

LPRINT <string>
sends bytes to paraller port

If you want to control directly the pins D0-D7 then you can use command:
OUT &H91,<byte>

Examples:
LPRINT "Hello World!";
OUT &H91,&B11001100

Serial is a bit harder... If you don't have RS-232 BIOS then you need some assembler knowledge... If you have RS-232 BIOS, then check out chapter 4.1 in MSX Technical Data Book:
http://www.tabalabs.com.br/msx/msx_tech_hb/msxtech_tabalabs.pdf

Example: