VIC-20 core not working properly in NTSC

[rcade]

The VIC-20 core is not working in NTSC properly anymore. A lot of games lock up that should not.

Easy example- Dig Dug cartridge. The code is NTSC, but it locks up in NTSC very soon after starting. In PAL, it runs fine.

There is some timing issue somewhere.

The last version that doesn't do this is VIC20_20200504.rbf. However, it has sound distortion issues.

[Stinky]

I've noticed some timing issues in Bandits, Capture the Flag, Super Amok related to interrupts.