Hmm.  According the the following, IBM Debug for z/OS, which includes what was 
IBM Debug Tool, supports 64-bit applications:

"IBM Debug for z/OS<https://www.ibm.com/us-en/marketplace/debug-for-z-systems> 
offers debugging and code coverage for z/OS applications written in COBOL, 
PL/I, C/C++ and Assembler with extensive support for legacy applications. It is 
powered by IBM’s next generation debug technology, the IBM z/OS Debugger, a 
full source-level debugger which supports debugging of 64-bit applications as 
well as optimized programs. IBM Debug for z/OS provides a 3270 user interface 
and a remote graphical user interface through integration with IBM Developer 
for z/OS and z/OS Explorer Aqua

IBM Debug for z/OS is a stand-alone debug product that includes the z/OS 
Debugger, the next iteration of IBM debug technology on z Systems that 
consolidates the IBM Integrated Debugger and IBM Debug Tool engines into one 
unified technology."


https://developer.ibm.com/mainframe/products/ibm-zos-debugger/


________________________________
From: IBM Mainframe Discussion List <[email protected]> on behalf of 
Joseph Reichman <[email protected]>
Sent: Monday, September 9, 2019 1:02 PM
To: [email protected] <[email protected]>
Subject: Part number for RDZ

As I became aware that to debug my 64 bit C/C++ code I would need rdz IDE

As debug tool doesn’t support 64 bit

Called up IBM sales that don’t realate to Rational developer for System Z or Rdz

Had anyone bought this would they have
the part number

It seems to me that IBM by changing names of products to increase sales ends up 
wasting more money in labor as people don’t know what you are talking about 
when you inquire

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