Changes
Z80
,/* Internal state */
* IM 1: Fixed vector at 0038h
* IM 2: Vector provided by I register and external data
The NMI vector is fixed at 0066h, regardless of the I register, and of the IM interrupt mode.
|-
| IFF1 || 1-bit || Main Instruction Fetch Flip-Flop || Set when interrupts are enabled, cleared on disable.
