hoglet67 / BeebFpga

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Mode 7 cursor alignment #20

Closed sharpie7 closed 2 years ago

sharpie7 commented 2 years ago

Hi Again

Question to see whether this is in my port or your original. In Mode 7 the cursor is about 1 or 2 pixels left of where it should be in my MiSTer port. Do you see the same thing?

Do you know where the cursor alignment between the CRTC and the teletext chip is controlled?

Thanks

hoglet67 commented 2 years ago

On BeebFPGA with SCART output it seems identical to a real Model B.

This is what I'm getting: IMG_2415

hoglet67 commented 2 years ago

The course cursor alignment is controlled by R8 of the 6845 (0, 1 or 2 characters)

The pixel level cursor alignment is just whatever delays there are through the Video Processor

I'm building with IncludeVideoNuLA = true (and have been for a long time)

Which Video Processor are you using?

It's possible this issue only exists with the original Video Processor implementation.

hoglet67 commented 2 years ago

Indeed, this is only an issue with the original Video Processor implementation (IncludeVideoNuLA = false). IMG_2418

This is now fixed.