| Element | DOS/VSE Assembler | Assembler H Version 2 | High Level Assembler |
|---|---|---|---|
| Object module | |||
| DXD, CXD and Q-type constants produced | No | Yes | Yes |
| Named COMMON | No | Yes | Yes |
| Unnamed CSECTS (private code) | No | Yes | Yes |
| SYM records produced | No | Yes | Yes |
| Generalized object format module generation (z/OS and CMS) | Not applicable | No | Yes. Refer to GOFF/XOBJECT assembler option. |
| Support for relative-immediate external references | No | No | Yes |
| Diagnostics | |||
| Diagnostic messages issued | At end of assembly | At line where error occurred if possible. | At line where error occurred if possible. |
| Diagnostic dump | No | Produced at time of failure | Produced at time of failure |
| Error diagnostics messages in mixed case | No | No | Yes |
| Resources | |||
| Work file | 3 Work Files | 1 Work File | No. Tolerated if allocated, but not used. |
| Associated data file | No | No | Yes |
| QSAM Input/output (z/OS and CMS) | Not applicable | No | Yes |
| External functions | No | No | Yes |
| Input/Output user exits | No | No | Yes |
| System-Determined Blocksize (z/OS) | Not applicable | No | Yes; supported in z/OS only. |
| 31-bit-addressable storage exploited during assembly | No | No | Yes; does not include I/O buffers. |
| Minimum virtual storage requirements | 200K | 200K | 610K |
| Printer control characters (z/OS and CMS) | American National Standard | Machine | American National Standard or machine depending on ASA option |
| Alternative assembler option sourcefile | No | No | Yes |
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