tag

#tsr

3 posts

FreeDOSHow-To July 11, 2026 4 min read

How to Build a TSR-Aware Batch Menu System on FreeDOS

Building a batch-file boot menu that manages memory-hungry TSRs — loading only what a chosen task needs, freeing conventional memory for everything else.

#howto#batch-files#tsr

FreeDOSDeep Dive July 11, 2026 5 min read

Upper Memory Blocks and Loading TSRs High

How DOS users reclaimed conventional memory by relocating drivers and TSRs into unused upper memory gaps, which varied by machine and BIOS.

#umb#tsr#memory-optimization

FreeDOSDeep Dive July 9, 2026 8 min read

TSR Programs: How DOS Ran Background Tasks Without Multitasking

A forensic guide to DOS TSR residency, interrupt hooks, chaining, INT 28h and InDOS reentrancy, multiplex IDs, memory ownership, safe unloading, and testing.

#tsr#freedos#dos