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NTSC2PAL

Posted: Sat Sep 26, 2020 8:13 pm
by GCHarder
This little routine will run a NTSC system at PAL speed. It does this by
bypassing the ROM's Display-3 routine, which then allows us to change the
margin value from 31 to 55.

See enclosed text for more info.

Demo video...

https://youtu.be/ZsgqFKky3a0

Regards;

Greg

Re: NTSC2PAL

Posted: Mon Sep 28, 2020 3:59 pm
by bola_dor
Impressive!!!

Re: NTSC2PAL

Posted: Mon Sep 28, 2020 10:08 pm
by bola_dor
I know very little about MC but I guess you are enlarging the amount of the lines in the margin letting more time for the CPU per cycle but not diminishing the active lines in the screen correspondingly in order to keep the Vertical Sync timing. I don't know if that's would be an easy task but it would provide a fantastic way to control speed vs screen in practically any aplication..
Better than a turbo switch.. and keeping compatibility with display systems..
Do you think it is possible?