Re: What is this Amdek card??

On Jun 17, 7:05 am, Sterling <sterl...@xxxxxxx> wrote:
On Jun 16, 6:35 pm, Chiral <escanf...@xxxxxxxxx> wrote:



On Jun 5, 2:13 pm, Knut <kr-l...@xxxxxxxxxxxxxxxxxxx> wrote:

pitz wrote:
On Jun 4, 1:17 pm, Knut <kr-l...@xxxxxxxxxxxxxxxxxxx> 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.- Hide quoted text -

- Show quoted text -

Nice Chiral, thanks!

I totally relate to that story and will record the information with
the card.

Now I just need to find a monitor somewhere that I can use with the
card...

The Apple Color II seems impossible to find now days, not to mention
whatever monitor this special cable goes to.
But some think a regular CGA monitor would work from the D9 on the
back.
What monitor did you drive with your Amdek card?

I have an Amdek Color II Plus. Made in July of 1983 (I was -5 months
old :-P )
As far as I know, these monitors are hard to find. For a while I was
looking for one as a spare, but I've never seen one. Even in 1992 it
was very hard to get any information. A shoutout is deserved to
"Ruben", the Amdek engineer who, after 3 months, found the correct
jumper positions written, effectively, on a napkin.

We may be the only two people who know this information.
.

Relevant Pages

  • Re: What is this Amdek card??
    ... doesn't have the 10 pin header, only the 16 pin header, and only two ... header on my card. ... monitor I needed to regenerate a vsync and to invert the sync signalshttp://home.online.no/~kr-lund/A2E-CGA.htm). ... cards) the red jumper came off and no one knew where to put it. ...
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