Cole Software's XDC - The most comprehensive and flexible product available for the debugging of Assembler language programs which execute in the OS/390 (MVS) operating system environments on IBM (and compatible) mainframes.
Systems/Asm - Dignus' HLASM compatible assembler product for the IBM mainframe. It's available as a native assembler for OS/390 and z/OS, or as a cross-assembler hosted on Windows, AIX, Solaris, FreeBSD, Linux and Linux/390.
Dave's unofficial HLASM web page - Tips and Frequently Asked questions about IBM's High Level Assembler (HLASM) and S/390 Assembler programming
Assembler for the mainframe - Basic routines in High Level Assembler Language.
Wynsoft's Assembler hints and tips - Useful hints and tips on writing IBM mainframe assembler code.
Tachyon 390 Cross Assembler - Now you can develop and maintain 370/390 assembler programs from your workstation! With the Tachyon Operating System you can test 370/390 Programs On Your Workstation!
Hilmas - a macro language for IBM mainframe environment ( VM/CMS, MVS, TSO/MVS, VSE and CICS )
Assembly Language: CS-310 - Text for the class 'IBM Mainframe Assembly Language Programming: CS310', by Dr. Laurence Leff at Western Illinois University.
The Assembler Connection - at SimoTime site. Provides examples of 370 assembler coding techniques, instruction set, utilities.
NIH Computer Center - Using Assembler Language - Inhouse doc for NIH, but also contains general assembler programming tips.
Hello, World program - MVS JCL (Assembly 370)
PC/370 - IBM mainframe assembler, linker, and emulator available since the 1980's. [Shareware]
Mainframe Express Assembler Option - Includes IBM mainframe high level language compatible macro assembler, linker, and emulator for seamless execution of COBOL and mainframe assembler applications on Windows PC.
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