10 REM PC-BASIC test 
20 REM DELETE and free memory
30 A$="#---#"+""
40 B$=a$+"a"+"b"
50 DIM C$(240)
60 FOR I=0 TO 230: PRINT I,:C$(I)=SPACE$(250): NEXT
130 OPEN "OUTPUT.TXT" FOR OUTPUT AS 1
140 PRINT#1, FRE(0)
150 CHAIN MERGE "TEST2", 160, ALL
160 REM
