_di	= $F0	; destination address
_si	= $F2	; source address

_vreg	= $F6	; the current selected VDC register
_creg	= $F7	; a copy of the VDC control register

_ax	= $F8
_al	= $F8
_ah	= $F9
_bx	= $FA
_bl	= $FA
_bh	= $FB
_cx	= $FC
_cl	= $FC
_ch	= $FD
_dx	= $FE
_dl	= $FE
_dh	= $FF