about resolution in video.v

[mist-devel]

about resolution in video.v

[thecrazyboy]

about <1> question, I checked issue list "15Khz support for NES core", maybe mode =1 is for TV not VGA?

[sorgelig]

As far as i understand the questions are about NES core. There are many cores in this repository, so be more specific when you ask.
The NES core originally was developed not for MIST board. So, the question #2 about quality of code you need to address to original NES author who is not in MIST community, i believe.
The core just had been ported to MIST without code refactoring by several reasons. If you want to improve the code then you are welcome to do it. Just make sure you don't brake it ;)

about #1:
For some reason, the master clock of pixels is twice higher than original. Hence double sizes in h counter (2 ticks per pixel). Since in VGA mode frequency is twice higher, the total h size is the same for TV and VGA.
But in TV mode there is half amount of lines compared to VGA, thus vertical values are adjusted to mode.
Total resolution in TV mode (mode=1) is 342x262, in VGA (mode=0) is 682x524.

In TV mode composite sync (H+V) goes to VGA_HS, while on VGA_VS is always 1 for AV-input switch in SCART. Check the Wiki page about VGA->SCART cable.

[harbaum]

We now have people asking for a second NES core ... I wish someone would start working on a SNES core instead :-) I'd be the first one to offer help as I'd like to show my kids how Mario Kart looked when it all started.

[harbaum]

Please close this issue if your question has been answered.