Thank you for the info R.Belmont. My prescale value is a bit high but I do see some difference in sharpness when going from 4 to 5 and even 6. I guess it is just a matter of personal preference.
I do have some of the same screen issues with HLSL turned off. For instance, the bottom missing line of pixels is always there and there is some minor form of the horizontal and vertical line running through the screen with HLSL turned off. It just becomes much more pronounced with HLSL turned on. The other issue of the large blurred area in the middle of the screen has only been apparent to me with HLSL turned on but it may just be very hard to detect when it is turned off as well.
I am mostly wondering if my experience is unique since I haven't seen any posts of others having the same issues. I'm so used to Mame having such a perfect rendered image that it just stands out to me that I'm having these issues in Win7. Mame, by far, has the most flexible and feature rich rendering capabilities of any emulator that I've used when it comes to rendering any resolution on a fixed resolution monitor in just about any way that you want. It makes me wonder why people who make other emulators don't copy Mame's rendering solution considering that all modern monitors are fixed resolution.
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