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diff --git a/blockgo.go b/blockgo.go
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+package main
+
+/*
+   blockfactor
+   block size calculator for most IBM DASDs
+   invoke wiht blockfactor DASD LRECL parameters
+
+
+   (c) 2017 by moshix
+   Program source is under Apache license             */
+
+import (
+	"flag"
+	"fmt"
+)
+/* global variables section */
+
+
+
+func main() {
+	var lrecl int = 0 // initialize lrecl
+	var dasd = "" //  initialize DASD type
+
+	dasdPtr := flag.String("dasd", "33903", "DASD model")
+	lreclPtr := flag.Int("lrecl", 80, "logical record size")
+	helpPtr := flag.Bool("help", false, "help flag")
+	flag.Parse()
+
+	lrecl = *lreclPtr // assign argument to main variable lrecl
+	dasd = *dasdPtr   // assign dasd type to main variable dasd
+
+	if dasd == "" {
+		fmt.Println("No DASD type entered. ")
+		fmt.Println("pls enter DASD type or restart with -h for list of DASD types")
+		fmt.Scan(&dasd)
+	}
+	if lrecl == 0 {
+
+		fmt.Printf("\nlrecl command line argument is not included.\n")
+		fmt.Println("Please enter lrecl size: ")
+		fmt.Scan(&lrecl)
+	}
+	if *helpPtr {
+		fmt.Println("Usage example:   ")
+		fmt.Println("blockfactor -h -dasd=3380K -lrecl=80")
+		fmt.Println(" ")
+		fmt.Println("-h         show this help         ")
+		fmt.Println("-dasd      dasd type (see table below)")
+		fmt.Println("-lrecl=80  logical record lengt")
+		fmt.Println("Possible DASD types:")
+		fmt.Println("2311 3330 3340 3350 3370 3375 3380A 3380B 3380E 3380K 33901 33903")
+		return
+	}
+    // build table with full track size (not half!)
+    table := make(map[string]int)
+    table["2311"] = 3625
+    table["2314"] = 7294
+    table["3330"] = 13030
+    table["3340"] = 8368
+    table["3350"] = 19069
+    table["3375"] = 35616
+    table["3380"] = 47476
+    table["3390"] = 56664
+    table["9345"] = 46456
+/*  this is just an exampmle on how to print out table
+    p.s. prints out in random order.... not sure why 
+for model, size := range table {
+         fmt.Println("Model",model, "size",size)
+    } */
+
+
+
+    // calculate optimum block size 
+    fulltracks := table[dasd]  //obtain pair value of key dasd
+    halftracks := fulltracks / 2 // half track size
+    blocksize := int((halftracks / lrecl) * lrecl)
+    fmt.Println("BLK100I Ideal blocksize for dasd ",dasd," and lrecl: ",lrecl," is: ",blocksize)   
+	return // official exit of main back to OS
+}