INT 14 - HP Vectra EX-BIOS - "F14_GET_BUFFER" - READ DATA INTO BUFFER
	AX = 6F03h
	CX = size of buffer
	DX = port number (0-3)
	ES:DI -> buffer for received characters
Return: AH = line status (see #00304)
	---on error (AH bit 7 set)---
	   AL = 00h
	   ES:DI -> next byte to be transferred
	---if successful---
	   AL = last byte read
	   ES:DI unchanged
	CX = number of bytes read
Desc:	read characters into the specified buffer until the buffer is filled
	  or a timeout occurs
Notes:	supported by original HP Vectra ATIBM PC AT and by ES/QS/RS series Vectras
	polls the Data Set Ready modem status and Data Ready line status bits
	  to determine when characters are available
SeeAlso: AX=6F00h,AX=6F02h,AX=6F04h