AH=30h DOS version          : 5.0
AH=2Ah/2Ch date+time ranges : ok ok
AH=02h + AH=06h             : AB
AH=01h + AH=0Ah (stdin)     : echo -> Ankur

                              AH=01h got 0x5A ; AH=0Ah count = 5, text = Ankur
AH=25h/35h vector 60h       : ok
AH=48h/49h alloc+free 4 KB  : ok
AH=48h ask for 1 MB (fails)  : CF=1 AX=0008 ; largest block (paragraphs) = 8E6C
AH=3Ch/40h/3Dh/3Fh/42h      : 12 bytes read ; LSEEK(end) says size = 12
AH=56h + AH=4Eh findfirst   : U.TXT size = 12
AH=41h delete, reopen fails : CF=1 AX=0002
AH=39h/3Ah mkdir+rmdir      : ok ; AH=19h drive = 2
AH=4Bh exec child           : Hello from INT 21h, AH=09h
AH=4Dh return code = 7 type = 0