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The [[BOS/360|Basic Operating System]] has two assembler versions. Both require 16 KB memory, one is tape resident and the other disk.<ref>{{cite manual
| title = IBM System/360 Basic Operating System Language Specifications Assembler (16K Disk/Tape)
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===Assembler D===
Assembler D was the [[DOS/360 and successors|DOS/360]] assembler for machines with a memory size of 16 KB. It came in two versions: A 10 KB variant for machines with the minimum 16 KB memory, and a 14 KB variant for machines with 24 KB. An F-level assembler was also available for DOS machines with 64 KB or more. D assemblers offered nearly all the features of higher versions.<ref name=ASMD>{{cite book|last=IBM Corporation|title=IBM System/360 Disk and Tape Operating Systems Assembler Language|year=1970|url=http://bitsavers.trailing-edge.com/pdf/ibm/360/dos/GC24-3414-7_Disk_and_Tape_Operating_Systems_Assembler_Language_Aug70.pdf}}</ref>{{rp|
===Assembler E and F===
Assembler E was designed to run on an OS/360 system with a minimum of 32 KB of main storage, with the assembler itself requiring 15 KB.<ref>{{cite book|title=IBM System/360 Operating System Assembler (32K) Program Logic Manual|year=1966|url=http://bitsavers.trailing-edge.com/pdf/ibm/360/asm/Y26-3598-0_32k_asmPLM_1966.pdf|publisher=IBM|id=Y26-3598-0}}</ref>{{rp|
===Assembler H===
Assembler H runs on [[OS/360 and successors]]; it was faster and more powerful than Assembler F, but the macro language was not fully compatible.
Assembler H Version 2 was announced in 1981 and includes support for Extended Architecture (XA), including the <code>AMODE</code> and <code>RMODE</code> directives.<ref>{{cite book|last=IBM Corporation|title=MVS/Extended Architecture Conversion Notebook|year=1984|url=http://www.bitsavers.
===Assembler XF===
Assembler XF is a mostly compatible upgrade of Assembler F that includes the new System/370 architecture instructions. This version provides a common assembler for OS/VS, DOS/VS and VM systems. Other changes include relaxing restrictions on expressions and macro processing. Assembler XF requires a minimum partition/region size of 64 KB (virtual). Recommended size is 128 KB.<ref>{{cite book|last=IBM Corporation|title=OS/VS Assembler Programmer's Guide|year=1973|url=http://bitsavers.trailing-edge.com/pdf/ibm/370/OS_VS/GC33-4021-1_OS_VS_Assembler_Programmers_Guide_May73.pdf}}</ref>{{rp|
===High Level Assembler===
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| publisher = [[IBM]]
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====High Level Assembler Toolkit====
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===IBM System/360 Model 20 assemblers===
IBM supplied two assemblers for the Model 30: the Model 20 Basic Assembler, and the Model 20 DPS/TPS Assembler. Both supported only instructions available on the Model 20, including unique instructions <code>CIO</code>, <code>TIO</code>, <code>XIOB</code>, <code>SPSW</code>, <code>BAS</code>, <code>BASR</code>, and <code>HPR</code>.<ref name="M20">{{cite book |last1=IBM Corporation |title=IBM System/360 Model 20 Disk and Tape Programming Systems Assembler Language |date=April 1970 |url=https://bitsavers.org/pdf/ibm/360/model20/GC24-9002-5_360-20asm_Apr70.pdf |access-date=October 2, 2023}}</ref>{{rp|
The DPS/TPS assembler is a somewhat restricted version of System/360 BPS/BOS Assembler.<ref name=M20 />{{rp|
===IBM System/360 Model 44 PS assembler===
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It has no support for storage-to-storage (SS) instructions or the ''convert to binary'' (<code>CVB</code>), ''convert to decimal'' (<code>CVD</code>), ''read direct'' (<code>RDD</code>) and ''write direct'' (<code>WRD</code>) instructions.<ref name=M44>{{cite book|last=IBM Corporation|title=IBM System/360 Model 44 Programming System Assembler Language|year=1966|url=http://bitsavers.trailing-edge.com/pdf/ibm/360/model44/c28-6811-1_360_44_Asm.pdf}}</ref> It does include four instructions unique to the Model 44: ''Change Priority Mask'' (<code>CHPM</code>), ''Load PSW Special'' (<code>LPSX</code>), ''Read Direct Word'' (<code>RDDW</code>), and ''Write Direct Word'' (<code>WRDW</code>).
It also includes directives to update the source program, a function performed by utility programs in other systems (<code>SKPTO</code>, <code>REWND</code>, <code>NUM</code>, <code>OMIT</code> and <code>ENDUP</code>).<ref name=M44 />{{rp|
===IBM System/360 TSS assembler===
The assembler for the [[TSS/360|System/360 Model 67 Time Sharing System]] has a number of differences in directives to support unique TSS features. The <code>PSECT</code> directive generates a ''Prototype Control Section'' containing relocatable address constants and modifiable data used by the program.<ref>{{cite book|last=IBM Corporation|title=IBM Time Sharing System Assembler Programmer's Guide|year=1976|url=http://bitsavers.informatik.uni-stuttgart.de/pdf/ibm/360/tss/GC28-2032-6_Time_Sharing_System_Assembler_Programmers_Guide_Apr76.pdf}}</ref>{{rp|
===Assembler G===
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