tag
5 posts
How FreeDOS SWSUBST combines SUBST and JOIN, edits DOS drive mappings, exposes CDS state, and avoids breaking programs that cache drive assumptions.
Set up 86Box, PCjs, or MartyPC to recreate the 5150's real hardware - 8088 at 4.77 MHz, floppy-only boot, PC DOS - and feel the 1981 constraints.
A source-backed guide to FreeDOS conventional memory, UMBs, the HMA, XMS and EMS, with safe Jemm and Himem configuration and troubleshooting practices.
A forensic guide to DOS TSR residency, interrupt hooks, chaining, INT 28h and InDOS reentrancy, multiplex IDs, memory ownership, safe unloading, and testing.
The history, goals, and real-world use cases behind FreeDOS, the open-source, actively-maintained continuation of the MS-DOS-compatible operating system line.