INT 21 - Phar Lap 386/DOS-Extender - CONVERT LINEAR TO PHYSICAL ADDRESS
AX = 2509h
EBX = linear address to convert
Return: CF clear if successful
ECX = physical address (carry flag clear)
CF set if linear address not mapped in page tables

See also: 212508

212509 - Phar Lap 386/DOS-Extender - CONVERT LINEAR TO PHYSICAL ADDRESS