Rip music from a CD/Tape and write your music to a CD
As I am starting this site newly,
first I am introducing with a simple MVS Assembler tutorial for
the beginers.
Here is a simple Hello World
assembler program which you can try to start with:
First create a PDS (partitioned dataset) say TRNG.WORK.ASM with LRECL=80, RECFM=FB and directory blocks 25. Save the following code as a member called HELLO in the PDS. Remember to keep the third qualifier of the PDS as ASM. Start coding from first column.
HELLO
CSECT
SAVE
(14,12)
Assembler
program in ISPF Edit session
BALR 12,0
USING *,12
ST
13,SAVEAREA+4
LA
13,SAVEAREA
TPUT 'Hello World',11
L
13,SAVEAREA+4
RETURN (14,12),RC=0
SAVEAREA
DS
18F
END
HELLO
Compile and
linkedit the member HELLO. Save the load module in say
TRNG.WORK.LOAD.
Run the load module
from TSO prompt as
Command ==> TSO EX '
TRNG.WORK.LOAD(HELLO) ' or as
Command ==> TSO EX
WORK(HELLO)
This will display Hello World in your screen. If you run this program in batch (background) you don't get any output. This is a very simple program to start with.
Here the TPUT (terminal put) is a assembler macro which writes to the terminal. You have to supply TPUT with the string and the length of the string.
Remaining code will be present in any assembler program. Don't worry about them now.
The statements before TPUT statement, save the registers (GPR - general purpose registers) and set the starting point of execution of the program.
Statements after
the TPUT stmt restore the registers and return the control to the
system.
There is only one
variable SAVEAREA has been declared here using DS (define
storage) stmt of size 18F (18 Full Words).
Click here for A more readable version of Hello World.
If
you have any suggestions
Mail me at shankarchatterjee@hotmail.com
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