Re: Apple II VGA Video Generator Card Project

[bieling@terra.es]

aiiadict@gmail.com ha escrito:

> >The address scanner and the pixel generator can be made programable via
> >software up to a certain point, more or less like the 6545 in the videx
> >is: Bytes per scan line, lines per frame, graphics buffer start
> >address, etc. As long as the resulting frequencies fall within the
> >monitor specs and the memory map permits, all will be ok.
>
> good idea!
> some softswitch built into the card that controls these things.

 some registers built into the card that control these things. :-)

>
> >So we better start learning some hdl...
>
> I'm learning VHDL.  It's pretty easy to understand the examples
> I've read and dissected.  Applying what I've learned so far to
> examples that *I* want to create is taking some time.

So, what block of the vga card diagram are you going to write in a hdl?

the dual ported ram ?
the softswitches state latch ?
the address scanner ?
the pixel & sync generator ?

choose one...