3 ms·

That would have wasted precious cycles for games that didn’t need it. The ‘n’ in NMI stands for non-maskable.

• bonzini 7y ago
  You can always mask it (enable/disable) at the place that triggers the NMI.
  • jdsully 7y ago
    Adding a a gate with jellybean logic was a noticeable expense in the 80s and would still be today.