INT 21 P - Phar Lap 386/DOS-Extender VMM v2.3+ - GET/SET VMM PARAMETERS AX = 252Eh CL = direction (00h get parameters, 01h set parameters) DS:EBX -> parameter buffer (see #01374) Return: CF clear if successful CF set on error EAX = error code (81h bad parameter value) Format of Phar Lap VMM parameter buffer: Offset Size Description (Table 01374) 00h DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. flags bit 0: page fault logging enabled ---v5.0+ --- bit 1: swap extender to disk during DOS EXEC call bit 2: don't zero allocated memory 04h DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. scan period for page aging, in milliseconds 08h DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. maximum size (in bytes) to check on each page scan 0Ch 52 BYTEs unused