Change in UMB allocation for DEVICEHIGH drivers when exceeding available upper memory in MS-DOS 6.22
Goal: Identify the rule that MS‑DOS 6.22 uses to decide which DEVICEHIGH‑loaded device drivers remain in upper memory blocks when the total requested UMB space exceeds the amount available from EMM386. Constraints/uncertainty: The placement varies with the order of DEVICEHIGH lines in CONFIG.SYS, the presence of LOADHIGH programs, the dynamic fragmentation o
msdos