> Does anyone know if there is something I can read online about how to calculate
> custom modelines so I don't have to just copy other people's?
I wouldn't go down that road, that's moving backwards. that's something people did in the past before groovymame and its automatic, safe, and highly accurate modeline calculating made everyone's lives a lot easier. I used to dabble in testing and messing around with custom modelines in the past, and all it got me was a few dead crt tv's from sending all sorts of wild out of range signals to it. even Calamity (groovymame author) himself had to get his arcade monitor repaired during groovymame development; he said it was his 'test' monitor which had all sorts of experimentation thrown at it.
powerstrip, soft15khz, arcadevga can be left in the past now, there's no need for that stuff. all that is needed is crt emudriver, a compatible ati card, and groovymame. let groovymame do the work for you automatically, that's what it's for. there's no need to be doing stuff manually anymore. if you get the odd game using groovymame which doesn't look right, then report it at the groovymame subforum at byoac forums, and Calamity/others will help sort out the problem.
I suppose in your defense, doing it your way is a good way of learning the ins and outs of modelines and how stuff works etc. personally when I was doing all that though, I found I was never playing games but instead, just always setting stuff up all the time and making sure everything was 'ok'. not to say that doing all that stuff wasn't fun and interesting, but personally for me those days were more about messing around with software and hardware, as opposed to actually playing any games.
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