[Coco] Altera DE1 - CoCo3FPGA suggestions

[Steven Hirsch]

On Fri, 21 Feb 2014, Nick Marentes wrote:

> VIDEO SCANLINES
>
> Define the switch made free after the CPU SPEED change to act as a Scanlines 
> ON/OFF switch.
>
> Currently, any CoCo3 video mode with a maximum of 225 scanlines is being 
> drawn twice to make up the 480 VGA style display. This is knoiwn as Scan 
> Doubled. When a new 480 scanline mode is activates, this doubling of 
> scanlines is turned off to provide a full res 480 line VGA display.
>
> When switch 1 is on, video for modes 225 scanlines or less should be handled 
> with Scan Doubling as it currently is.
>
> When switch 1 is off, video for 225 mode scan lines are drawn as 1 normal 
> scan line and 1 blank (black) scan line to simulate the scan lines of a 
> classic non VGA monitor. This gives a more “authentic” look to the display 
> and tends to make games look better.

Seconded.  I bought a little gadget called a SIG-3000 that synthesizes 
scan lines in a VGA signal.  Improves the looks of almost all classic 
systems when displaying on an LCD monitor.  If it can be done in the 
cocofpga, all the better.



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