undefined | Better HN

0 pointsklodolph6y ago0 comments

Given that the NES had NMI and the 2600 didn't, I think that NMI probably should have been wired to horizontal blank to begin with. I'm sure that there is some reason why this wasn't done, but I can't understand why.

0 comments

3 comments · 1 top-level

jdsully6y ago· 2 in thread

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

bonzini6y ago

You can always mask it (enable/disable) at the place that triggers the NMI.

jdsully6y ago

Adding a a gate with jellybean logic was a noticeable expense in the 80s and would still be today.

j / k navigate · click thread line to collapse