Re: Apple ][ to VGA monitor adapter board - looking for best color decoding method

[ferdimh@gmx.de]

Hi all!

With the understanding of the decoder circuit (I got the schematics
from Marcus Heuser - thank you!)
I was able to optimize color displays. The principle of the Shift
register/latch circuit delivers a very poor picture if a different
resistor network is connected to get RGB output. This was unusable, my
method was far better. But, based on the resistor network  of the PAL
color card, I was able to recalculate my values and got to this:
http://img87.imageshack.us/my.php?image=comparisonau3.jpg
The lower monitor is a 14'' NTSC device connected to the video out,
the upper monitor is a 12'' IBM VGA connected to my card.
I also tried some games:
http://img301.imageshack.us/img301/1107/pacmanxj0.jpg (HIRES)
http://img87.imageshack.us/img87/2020/airheart1vgand9.jpg (DHIRES)
I'm just wondering how to continue. I might finish the PCB layout
tomorrow, so I need to decide whether I make a prototype on my own -
which is a lot of work (566 pads/204 vias) to be done or if I decide
to let some guys make the PCB. But a 268mm x80mm is going to be
expensive in prototype volumes (i.e. 1 or 2). It seems that PCBs are
way cheaper in the US than in Europe...why? I might actually let them
make in the US and ship them here.

Ferdinand