Having built countless similar conversions, EBCDIC[1] to ASCII can be as simple as a lookup table and &quot;packed string data&quot; is just binary coded decimal [2] with a sign.<p>What is a fixed delimited file?  A &#x27;mainframe&#x27; file is generally fixed length or delimited.<p>[1]: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;EBCDIC" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;EBCDIC</a><p>[2]: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Binary-coded_decimal" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Binary-coded_decimal</a>