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Forums > C64 Coding > Disk fastloaders PAL broken in NTSC, why?

2013-11-20 12:27

Flavioweb

Registered: Nov 2011
Posts: 463

Disk fastloaders PAL broken in NTSC, why?

I'm studing some fast loaders code, and noticed that some loaders that turn off vic using D011, works in PAL but stop working in NTSC...
Why?
Since there are no badlines or sprites actives, but irqs still alive (no SEI in code) both in PAL and NTSC, what is the reason?

2013-11-20 12:35

chatGPZ

Registered: Dec 2001
Posts: 11386

the timing is tight, and the cpu clock is different.

2013-11-20 15:39

Flavioweb

Registered: Nov 2011
Posts: 463

Quoting Groepaz

the timing is tight, and the cpu clock is different.

So computer is faster but drive work at same speed?

2013-11-21 02:19

Fungus

Registered: Sep 2002
Posts: 686

Yes, computer is 1.02 mhz (vs 998khz) and drives remain 1mhz exactly.

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