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- From: bobt@bbs1984.chi.il.us (Bart Simpson)
- Newsgroups: comp.sys.amiga.graphics
- Subject: How the system 'knows' it's PAL or NTSC
- Message-ID: <bobt.01md@bbs1984.chi.il.us>
- Date: 15 Aug 92 05:54:31 GMT
- Organization: Not an Organization
- Lines: 25
-
- About two weeks ago, I made the modification on my NTSC A500 with a rev. 6A
- motherboard which causes the machine to boot up in PAL mode (cut to jumper 4 by
- the agnus socket). I did this mainly to make it easier to boot up PAL games
- (degrader doesn't work all the time for me). Well, after getting really
- annoyed by the 50 hz flicker, I set the WB to come up as NTSC.
-
- Ok, that works fine. But I've noticed programs which open up custom screens
- (e.g. Directory Opus, Civilization) come up in PAL mode.
-
- So I messed a bit with the system vert blank rates in ExecBase and the default
- screen size in GfxBase, but those had no effect.
-
- My question is: What else does the system look at to determine how to open a
- screen? Are the parameters changeable?
-
- What I really want to do is write a little prog to make the system still think
- it is a NTSC spec machine instead of PAL spec.
-
- Yes, I could just solder two wires and a SPST switch to switch into either
- PAL/NTSC, but I would like to try the software method out first.
-
- Bob Tomasevich, Sears Point of Sale programming team.
- My opinions are not those of my employer, Sears, Roebuck, & Co.
-
- Please, someone buy something from us... we're not that bad!
-