• HLASM 1.6 compatibility, including, but not limited to:
  • Integrated support for instructions and new instruction formats thru the z/HE line of processors.
  • Unsigned constant values in F-/H-type constants.
  • mnemonic suffixes, :ASM/:MAC.
  • New SY-type and QY-type constants.
  • Support for decimal special values and types.
  • Ignore leading zeros in decimal, binary and hexadecimal self-defining terms.
  • Ability to add OPTABLE to the ACONTROL instruction.
  • Improved diagnostics.

• Support for new 'asma90 compatibility mode'. If DASM is executed via the 'asma90' command, it operates compatibly with IBM's asma90 program.

• Support for new -options="string" option that allows DASM to process HLASM PARM values without mapping to DASM options.

• Ongoing compatibility and performance improvements.

Release 1.80 of DASM provides the following enhancements:

• HLASM 1.5 compatibility, including, but not limited to:
  • HLASM V1R5 ADATA format
  • New RRR and SSF instruction formats, and support for z9 BC decimal FP, floating point and other miscellaneous instructions and data types.
  • Increase the SETC and macro parameter length to 1024.
  • Support for new options, SUPRWARN/NOSUPRWARN, FLAG(SUBSTR), IMPLEN/NOIMPLEN, FLAG(CONT)/FLAG(NOCONT), SECTALGN.
  • Length checks for DP and MP instruction operands.
  • New 'Relocatable Immediate' RLD type for relative references to external symbols. Listing now uses the HLASM V1R5 format of the "Relocation Dictionary."
  • Support program attribute on DC and EQU values.
  • ORG psuedo-op extended with new 'boundary' and 'offset' operand expressions.
  • Support for HLASM V1R5 conditonal assembly functions syntax and full support of HLASM V1R5 functions.
• Command line parameters are now provided in the Options Summary section of the listing.
• New DASMINI environment for expanded parm processing.
• Accept CE'string' and CA'string' for explicit EBCDIC/ASCII constants.
• Generate an IBM "events file" for use in Websphere, Rational developer or the TPF and z/TPF toolkit products.
• IDR default now changed to be different than HLASM.
• Support for EXCI mode in DCCPA CICS preprocessor.
• On going support and general enhancements that improve compatibility with HLASM V1R5.
• Support for Solaris/x86 cross-platform.

• Added support for the &SYSMAC builtin variable
• Support HLASM 1.4 THREAD/NOTHREAD option
• Add support for reading a file from the STDIN stream
• Listing lines from COPY, MACRO, AINSERT and AREAD while now be properly annotated with the HLASM defined characters (+,=, etc..)
• Support DEQUOTE built-in
• New FLAG(CONT)/FLAG(NOCONT) options and associated continuation messages #430-433.
• Allow unlimited continuation lines on comments as the newer HLASM 1.5 appears to do.
• Support for the -profile=NAME,-xprofile option and PROFILE options in *PROCESS statements. Causes DASM to include NAME as if it appeared on a COPY statement at the start of the primary source file.
• Instructions from the z/990 Facility #3 were added: CU12, CU21, CU14, CU41, CU24, CU42, TRTR, SRSTU, ESAIR, EPAIR, PTI and SSAIR.
• Symbolic cross-reference algorithms where enhanced to provide a 15-times speed up when the -cxs (XREF(SHORT)) option is enabled.
• Support for J-type constants; which hold the length of a DXD or DSECT (filled in by the linker). Support for RSECTs, etc... to allow full GOFF DLL-creation support.
• HLASM 1.5 alignment enhancements:
  • New -sectalgn option and handling of SECTALGN in *PROCESS statements. Literal pools and sections are aligned on the SECTALGN boundary.
  • Literal pool management extended to 5 literal pools, with literals that are a multiple of 16-bytes going into the first (new) pool.
  • Message DASM500W to warn when a literal's alignment was greater than that specified in SECTALGN.
  • Support for VD and QD type DC/DS constants.
  • Support HLASM 1.5 new maximum limits on scale modifiers for F and H constants.
• New ESD ID column in the Cross Reference listing.
• Support *ASM XOPTS and *PROCESS XOPTS in DCCPA
• Added -fmrc and -fnomrc options. -fmrc is the default and indicates that mainframe-return-codes should be used. -fnomrc indicates UNIX-style return codes.
• Added some CICS TS features to READ/READNEXT/READPREV in DCCPA
• Support EXEC CICS SET FILE/DATASET command in DCCPA

Release 1.75 of DASM provides the following enhancements:

• A new -fmaxrc=n option was added. If the total return code from DASM is greater than `n', then any partially written output object will be deleted.
• A new -fdate=[[[[[cc]yy]mm]dd]HH]MM[.ss]] option was added. This option sets the 'assemble date/time', used for the listing, the value of SYSCLOCK, the time-stamp on END cards and the time values returned by AREAD.
• Support for the new TYPECHECK option, similar to up-coming HLASM (described in APAR PQ69375.)
• Many performance improvements, in some cases resulting in up to 27% assembly-time improvements.
• The assembler, by default, keeps its temporary work file in memory. The new -size=0 option is supported to indicate that the temp file should be kept on-disk instead.
• The "Statements Flagged" section is presented in the listing and the FLAG(RECORD) (-frecord/-fnorecord) options are supported.
• New COMPAT(LITTYPE) (-clit) option supported, which controls application of type-attributes to literals.
• New UNREFS XREF (-nx option) which generates a listing section containing unreferenced symbols.
• The *PROCESS statement is supported.
• A new -tr XX=YY option, which controls how EBCDIC<->ASCII translation is performed on cross-platform hosts.
• Support for FLAG(ALIGN), FLAG(NOALIGN) (-f align, -f noalign) options, which also control message #212 and #213.
• New -pestop, -xpestop options.
• DASM now properly handles ACONTROL statements and the PUSH/POP ACONTROL commands.
• New -ra2 and -xra2 options similar to HLASM's RA2 and NORA2. to HLASM's RA2/NORA2.
• Improved HLASM compatibility and other corrections.

Release 1.70 of DASM provides the following enhancements:

• Support for new z990 instructions and Y-type instruction format, and the new -yop option to enable/disable these.
• New -mcase option, similar to HLASM's OPTION(MACROCASE).
• ADATA generation improved to be more compliant with HLASM.
• Added missing mnemonics for branch relative, Jump instructions, etc.. these are not documented in the HLASM documentation; but appear in the z/Architecture Reference Summary
• The 'System Name' and &SYSID variable are improved to include the operating system type and release for cross-platform hosts.
• Added "Diagnostic Cross Reference and Assembler Summary" section in the listing, similar to HLASM.
• Support for Linux/390 and z/Linux (ELF) objects, using ASM source that is as unchanged as possible. This makes porting HLASM source from traditional mainframe operating systems to mainframe Linux much easier. This support includes complete debugging information representing line numbers in the original source, as well as DSECT member information.
• Improved CICS preprocessor support in DCCPA.
• Ongoing corrections and maintenance.

Release 1.60 of DASM provides the following enhancements:

• New hosted platforms, z/Linux (64-bit mainframe linux) and OpenEdition (Unix System Services.)
• Under OpenEdition, DASM can read EBCDIC new-line delimited source/macros from the HFS as well as PDS members.
• New DCCPA utility - a complete CICS pre-processor, supporting CICS TS V2 and CICS ESA R4.
• Improved ADATA format, much more closely matches IBM's HLASM output.
• Improved documentation, PDF documentation now includes a table of contents with links into the document.

Release 1.50 of DASM brings many new features.

• Extensions to support Systems/C++.
• Full support of GOFF format objects.
• Support for Associated Data (ADATA) information, either embedded in GOFF objects, or as a separate file.
• Support for the ADATA instruction.
• 64-bit instructions and data formats.
• Listing reformat to look more like IBM's HLASM listing instead of ASMH.
• New listing cross-reference information.
• New extended message formats that include extra information.
• Extensions to the % expansion characters in MACRO and COPY file name searches.
• Support for accessing MACRO and COPY members from PKZIP archives.
• Performance enhancements, assemblies are now 10% to 20% faster than with V1.00.
• Several HLASM compatibility corrections.