INT 21 - Phar Lap 386/DOS-Extender - GET HARDWARE INTERRUPT VECTORS

	AX = 250Ch
Return: CF clear
	AL = base interrupt vector for IRQ0-IRQ7
	AH = base interrupt vector for IRQ8-IRQ15
	BL = interrupt vector for BIOS print screen function (Phar Lap only)
Note:	this function is also supported by FlashTek X-32VM
SeeAlso: INT 31/AX=0400h,INT 67/AX=DE0Ah