Re: Bad video output on RiscPC

Ben Harris wrote:


> Ah, well done.  I thought the VIDC20 data sheet explicitly said that the 
> minimum border width was zero, but I may be confused, and it's possible 
> that the code actually asks for a negative border width or something 
> similarly stupid.
> 
Maybe a red herring. All the VESA specs I can find suggest that 0 
borders(VESA calls them margins as you guessed) are okay as well. Based 
on the fact that the monitor is locking on to the mode and reporting the 
horizontal and vertical refresh rates I would expect for the mode I 
think these vidc registers correct. It looks more like the transfer 
between VRAM and VIDC is not being synced properly.

Mike