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DOS/360 offered Basic Telecommunications Access Method ([[BTAM]]) and Queued Telecommunications Access Method ([[QTAM]]). BTAM was primitive and hard to use by later standards, but it allowed communication with almost any type of terminal, which was a big advantage at a time when there was little standardization of communications protocols. The simplicity of its API also allowed the relatively easy interface of external communications processors, which facilitated DOS/360 machines becoming nodes in the multi-tier networks of large organizations. Conversely, QTAM users didn't need as much knowledge about individual devices because QTAM operated at the logical level using the OPEN/CLOSE/GET/PUT macros.
==Job control==
==Job control<ref name=ControlStatements>{{cite book|last=IBM Corporation|title=System/360 Disk Operating System User's Guide: Control Statement Techniques|year=1967|url=http://www.bitsavers.org/pdf/ibm/360/dos/GC20-1685-0_Disk_Operating_System_Users_Guide_Control_Statement_Techniques_Dec69.pdf}}</ref>==▼
All DOS job control statements began with "{{mono|//}}" in card columns one and two except ''end-of-job'' which was "{{mono|/&␢}}", ''end-of-data'', "{{mono|/*␢}}", and ''comments'' , "{{mono|*␢}}". (''In the description that follows the character "{{mono|␢}}" represents a single blank''.)
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* The {{code|VOL}} statement provides disk or tape volume label information for standard label checking. The format is <syntaxhighlight lang="jcl" inline>// VOL SYSxxx,<volume></syntaxhighlight>.
* DOS originally provided the {{code|TPLAB}} statement for tape label information and the {{code|DLAB}} and {{code|XTENT}} statements for disk label and extent information. At least as early as 1968 the {{code|TPLAB}} statement had been replaced by {{code|TLBL}} and the {{code|DLAB}} statement by {{code|DLBL}} . These statements used numerous [[Job_Control_Language#Positional_parameters|positional parameters]] and had fairly high information densities.
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==Differences from OS/360==
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