A while back a came accross this resolution chart which is really helpful, and kudos to the xbox-scene member who took the time to create it, but it never quite worked out for me on MednafenX Pc-Engine.
768*696 gave me an overall OK picture with nearly no scaling artefacts, but there was an area on screen, somewhere in the middle, where pixels were unstable and showed very minor scaling.
I thought this could have a thousand reasons like different resolutions actual PC-Engine games ran in, my television is just not pixelperfect, or just an Xport emulator related problem - who knows?
After reading the english wiki about the PC-Engine, I realised that it has been updated regarding video modes, and showed some rather odd numbers like 256×239
. Following the link
in the wiki leads to a very interesting discussion concerning the PC-Engine's resolutions.
I knew, that 768*696 was very close to the real thing, and could only be off by 1 or 2 pixels vertically. Well, actually I found that 3 pixels were the (my) solution.
Setting the screen to 768*693
will produce no scaling at all. To have a bit more content onscreen I use 1024*693
Maybe some of you got some spare time to test it out sometime.