sp = $20e4
sreg = $20e6
_r0 = $20e8
_r1 = $20ea
Base pointer.
_bp = $20ec
Source address.
_si = $20ee
Destination address.
_di = $20f0
_ax = $20f8
_ax LSB
_al = _ax
_ax MSB
_ah = _ax+1
_bx = $20fa
_bx LSB
_bl = _bx
_bx MSB
_bh = _bx+1
_cx = $20fc
_cx LSB
_cl = _cx
_cx MSB
_ch = _cx+1
_dx = $20fe
_dx LSB
_dl = _dx
_dx MSB
_dh = _dx+1