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#int21

2 posts

FreeDOSDeep Dive October 3, 2026 7 min read

DOS INT 21h File Creation: Temporary Names and No-Clobber Semantics

Choose between DOS create, exclusive-create, and temporary-file calls; understand the returned handle, pathname buffer, failure modes, and cleanup lifecycle.

#freedos#dos-api#file-creation

FreeDOSDeep Dive October 3, 2026 7 min read

DOS Network Redirectors: INT 21h Assign Lists Versus Packet Drivers

Trace DOS network-drive mapping through the historical INT 21h redirector contract and distinguish remote filesystems from packet-driver TCP/IP access.

#freedos#networking#redirector