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