Posted By
Majikeyric
on 2016-01-14
09:17:08
 |  Detect PAL/NTSC ?
Hi!
What is the easiest reliable method to detect the video system ?
Is checking bit 6 of $ff07 sufficient ?
Or counting the max vertical raster position ?
Thanks
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Posted By
crock
on 2016-01-14
09:25:01
 | Re: Detect PAL/NTSC ?
Read location F33F in the kernal ROM. #$08 for PAL, #$48 for NTSC.
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Posted By
gerliczer
on 2016-01-14
11:15:51
| Re: Detect PAL/NTSC ?
Read KERNAL ROM location $FF80. If MSB is 1 the machine should be PAL, if 0 then NTSC.
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Posted By
Csabo
on 2016-01-14
12:44:08
| Re: Detect PAL/NTSC ?
Yes, check bit 6 of $FF07 is sufficient, and by far the most common method actually used in code. The other suggestions above can also work.
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Posted By
Majikeyric
on 2016-01-16
05:11:44
| Re: Detect PAL/NTSC ?
WOW ! at least 3 ways to detect the video system! great ! 
Thanks for the information 
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Posted By
Litwr
on 2016-01-16
11:46:35
| Re: Detect PAL/NTSC ?
There are exactly 618 bytes different in PAL and NTSC ROMs. :)
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