)
Call VioWrtNAttr with:
	STACK:	WORD	VIO handle (must be 00h)
		WORD	column at which to start writing
		WORD	row at which to start writing
		WORD	number of times to write attribute
		DWORD	pointer to display attribute to replicate
Return: AX = error code (00h, 74h, 166h, 167h, 1B4h) (see #00373)
Note:	write wraps at end of line and terminates if it reaches end of screen