System requirements
High Level Assembler (HLASM) and Toolkit Feature runs on MVS/ESA, OS/390, VM/ESA and VSE/ESA.
| Operating System | Software | Hardware |
|---|---|---|
| MVS/ESA | IBM System Modification Program/Extended (SMP/E) | |
| VM/ESA | IBM VM Serviceability Enhancements Staged/Extended (VMSES/E) and VMFPLC2 | |
| VSE/ESA | Maintain System History Program (MSHP) to install High Level Assembler |
