Windows · Free download · General

z390 Portable Mainframe Assembler1.5.0.3

z390 Portable Mainframe Assembler : Development tool for assembling, linking and executing macro assembler programs, available via a graphical and command-line interface

Operating system
Windows 10/11
File size
9.7 MB
License
GNU Public License
Last updated
May 1, 2026
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Overview

What is z390 Portable Mainframe Assembler?

z390 Portable Mainframe Assembler : Development tool for assembling, linking and executing macro assembler programs, available via a graphical and command-line interface

In depth

A closer look at z390 Portable Mainframe Assembler

z390 Portable Mainframe Assembler is a free and open-source application written in Java that offers both a graphical and command-line interface for assembling, connecting and executing programs via simple commands. The downloaded package includes the source code as well as a demo. Users can type ASMLG demoDEMO to assemble and execute demo.mlc. It offers support for common macros, such as READ, WRITE, CHECK and POINT (random), OPEN, CLOSE, DCB, PUT and GET (sequential), SPIE, SNAP, ABEND and STAE, STIMER, TIME and TTIMER, FREEMAIN and GETMAIN, WTOR, POST, WTO and WAIT, along with RPL, ACB, PUT, GET, POINT, MODCB, TESTCB and GENCB (VSAM). Sequential and random file access can be done via EBCDIC or ASCII. The supported structured macros are IF, ELSEIF, ENDIF, DO and ENDDO. The graphical interface of z390 Portable Mainframe Assembler features popup menus (File, Edit, Options, View, Help), a log area that can be scrolled to view the output of each sent command, and a status bar that shows batch I/O and other status details. Also, users can customize options when it comes to the window location, size and font, as well as submit, monitor and cancel batch commands.

Verdict

Should you download z390 Portable Mainframe Assembler?

z390 Portable Mainframe Assembler runs on Windows 10/11 and is available under the GNU Public License license — the installer is 9.7 MB. We’ve catalogued it under General.

Verified clean. Every z390 Portable Mainframe Assembler build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
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At a glance

z390 Portable Mainframe Assembler specifications

Category
General
Publisher
Automated Software Tools Corporation
Last updated
May 1, 2026
License
GNU Public License
Operating system
Windows 10/11
File size
9.7 MB
Price
Free
Page views
756

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