Ok, I've given it a shot. Here's my report!:
I used 640x480, checked interlaced mode, set the horizontal scan rate to 15.75 and the vertical refresh to 30 hz. It wouldn't let me use any other refresh rate with that horizontal scan rate, so it seems as if these to fields are joined together, that is, if you change one the other value follows suit. However, 30 hz interlaced, shouldn't that equal a 60 hz mode?
Now, I actually did get a stable picture on my arcade monitor (
). BUT, there where several problems. For one, none of the sync lights on my JPAC would lit up, which kinda tells me something is wrong (I have the JPAC jumpers set to 15 and 31 dual mode). The picture was strangely drawn out and the mouse cursor was way off, but somehow got less off the closer to the top portion of the screen I put it. Also the colors where very washed out (I think someone technical would describe it as "white-out").
I somehow suspect that I didn't get a proper 15 khz mode, but was seeing a distorted version of the JPAC's dual 15/31 mode.
I should mention that I haven't gotten my geforce3 to work with advancemame. Until I recently got my new computer I used an ATI rage pro, which worked flawlessly under dos.
So there are several possibilites:
1) My graphics card is unable to produce a proper 15 khz picture.
2) I have to tweak the other timing options available in Powerstrip (most of the values I haven't got a clue as how to set them)
3) Powerstrip is unable to produce the required 640x480 / 60hz / 15 khz / interlaced mode.
4) Probably lots of other reasons...
My setup is a geforce3 500 ti, Neotec 2515 (15 khz arcade monitor) and a JPAC.
So what do you reckon? I'm trying it again next week when my Trident Blade3d arrives.
Any word of someone trying to port SAKAs (vsyncmame) driver to windows xp??? That would probably be the next best thing for us users who wants to keep up with the emulation software development...
/ Peter