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Reference.org
Basic direct access method
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<p>Basic Direct Access Method, or BDAM is an <a href="/facts/Access_method/ITDHX6ag">access method</a> for IBM's <a href="/facts/OS%2f360_and_successors/nQbdNbx6">OS/360 and successors</a> computer <a href="/facts/Operating_systems/8XTuvMh2">operating systems</a> on <a href="/facts/IBM_System%2f360/7znvpy4K">System/360</a> and later <a href="/facts/IBM_mainframe/0kPkgADx">mainframes</a>. BDAM "consists of routines used in retrieving data from, and storing data onto, <a href="/facts/Direct_access_storage_device/dr0tg5Hl">direct access devices</a>.": p.5 BDAM is available on <a href="/facts/OS%2f360/nQbdNbx6">OS/360</a>, <a href="/facts/OS%2fVS2/VMcDqsSB">OS/VS2</a>, <a href="/facts/MVS/VPSmB9ML">MVS</a>, <a href="/facts/Z%2fOS/amLCAlgV">z/OS</a>, and related high-end operating systems. </p>