In order to run any BASIC program, you will need BASICA or GWBASIC which 
is usually included on your copy of the DOS disk.  You can recognize a program 
written in BASIC by looking at the three digit extension (xxxxxxxx.BAS) BAS.  
The best way to run a BASIC program is by putting a disk with BASICA or 
GWBASIC in one drive and the program disk in the other.  For example, to run a 
BASIC program with the name SAMPLE.BAS, perform the following steps:

1. Put the BASIC disk in DRIVE A: and the program disk in DRIVE B:

2. Log to the drive with the program disk in it by entering "B:" (without the 
   quotes, of course.) 

3. Type "A:BASICA SAMPLE" or "A:GWBASIC SAMPLE" and press ENTER.

If you don't have two drives, 

1. Copy GWBASIC or BASICA to the program disk. 

2. Type "BASICA SAMPLE" or "GWBASIC SAMPLE" and press ENTER.