NextREG¶

All 256 NextREG registers with a name for the ones JNEXT knows about, and the value in both hex and binary.
The Hex column is editable: type a new value and it is written to the
register exactly as NEXTREG nn,n would write it, with all the side effects
that implies. The values shown are the live values composed by the hardware,
not merely the last byte written — so a Layer 2 enable set through port
0x123B correctly shows up in NR 0x69.