Re: What is this Amdek card??

[Chiral <escanfail@gmail.com>]

On Jun 5, 2:13 pm, Knut <kr-l...@nogarbage.online.no> wrote:
> pitz wrote:
> > On Jun 4, 1:17 pm, Knut <kr-l...@nogarbage.online.no> wrote:
> >> That card looks simpler than my card, which is made by Apple. My card
> >> doesn't have the 10 pin header, only the 16 pin header, and only two
> >> switches in the dip-switch. The jumper puts 5V on one pin in the 16 pin
> >> header on my card. There is a 15pin flatcable that goes from the 16 pin
> >> header to a female 15 pin D type connector. (To use it with the CGA
> >> monitor I needed to regenerate a vsync and to invert the sync signalshttp://home.online.no/~kr-lund/A2E-CGA.htm).
>
> > That Apple RGB card, coupled with the Video7 Mappler adapter (which
> > probably has the same function as the circuit you have) outputs great
> > to a CGA monitor.  The Video7 Color Enhancer for the IIc likely has a
> > similar mechanism inside (but different pin connections at the 15-pin
> > D connector), because it generates the same image on the CGA monitor.
>
> >http://picasaweb.google.com/simplepractices/Posts#5343584224512999154
> >http://picasaweb.google.com/simplepractices/Posts#5343584230712843682
> >http://picasaweb.google.com/simplepractices/Posts#5343584230011130466
> >http://picasaweb.google.com/simplepractices/Posts#5343584230983369666
>
> I also created a circuit to jumble around the CGA colors to the best fit
> for the apple rather than the straight (using one GAL22V10).
>
> It is very nice but I think I will swap to either use one of the
> taxan/kaga monitors or to use a card that has VGA/multisync output
> instead of the RGB card.
>
> That RGB card doesn't represent all colors correctly (with NTSC as a
> reference) and sometimes colors text screens badly. There is a switch to
> write to to fix the textscreens, a poke which can be done before
> starting a program. If I'm correctly informed Video7 designed that card,
> there is also a '(c)1984 Video7' on the card as well as the Apple text.
>
> I was not satisfied with 80col using NTSC and didn't like to use a b&w
> monitor for games so I got the RGB card with which both works. I had
> actually realized beforehand that I would have trouble getting a
> suitable monitor because of the timing. I had hoped I could get
> something working and the CGA monitor became the solution.
>
> BTW
>
> to the original poster the pinning for that taxan/kaga plug would be
> 1 open 2 red 3 green 4 blue 5 ground 6 ground 7 hsync/csync 8 vsync
> 1 is the upper one of the two that are a little separate as seen on the
> monitor with 1 and 5 to the right. 5 is below 1. Like this
> 4 3 2  1
> 8 7 6  5
> and it is used with analog RGB, mode II.
>
> When I now looked at the docs I had, again, I see that I need to use
> mode I for my RGB card as the signals are TTL and there is an intensity
> signal and the negativ composite sync... and as this mode uses the DIN
> plug so I can make another cable. I'll try that now. I can even use the
> color swapper I made for the CGA monitor, I think. :-)
>
> Knut

Here's the story on the jumpers. When I was 8 (i have one of these
cards) the red jumper came off and no one knew where to put it.
Eventually, I got ahold of some wise fellow at amdek (this was 1992 -
1993) and he found the proper connections for me. I have remembered
ever since (and i still use my //e anyways).
The red jumper goes on the left leg of R7. The blue jumper goes on the
right leg of R34.