Re: RGB card

mojoehand wrote:
On Nov 9, 1:33 pm, mojoehand <jg...@xxxxxxxxxx> wrote:
In another thread, I posted the information below about a card I am
trying to figure out. Since I posted several questions in that thread,
I thought I would break this one out separately.

Upon further searching, I understand that Apple sold an RGB card for
the IIe that was manufactured by Video-7. I can't seem to find any
manual or other information on the Apple card. I thought that perhaps
it is similar enough to help me figure out the card I have (also made
my Video-7). In particular, I would like to know the pinout of the
DB9F on my card. Then I could wire up a video cable to test the card.

I also have a video card that I need help figuring out. The card
measures 5-1/2" long by 2-3/4" high (w/o the gold fingers). Near the
upper left are a 16-pin header and a 10-pin header. The 10-pin header
has a ribbon cable that terminates in a DB-9F. Just above the 16-pin
header is "Seiko-AAF". To the right of the 10-pin header, in large
letters is "AMDEK___". About an inch below the 10-pin header is a 3-
pin jumper, labeled "J2". About an inch below that is "Video - 7
Inc.". The board is populated with 14 TTL chips and one PAL. I assume
that it drove an Amdek monitor, but was it B/W, color, TTL, RGB, or
whatever? Anyone have a clue?

I found an image of a card that is decribed as a Video-7 RGB card on a
web site. I posted it here: http://i38.tinypic.com/ndlq9z.jpg

This is a picture of the very similar card that I have:
http://i36.tinypic.com/2e0vkp0.jpg

Similar in intent, and perhaps function, but quite different in design.
They are clearly both digital RGB cards.

Note that the first card has a part number of 600-0002 and my card is
600-0012. Checking my card with an Ohm meter, pins 1,2 and 7 of the
DB9 are grounded. This corresponds with the pinout of an IBM CGA
monitor (although pin 7 is "Reserved" on CGA). My card also has a 16
pin header, which I'm guessing would be used with an Apple RGB (TTL)
monitor instead of a CGA monitor. From my research, both monitors are
capable of 16 colors (not analog RGB, like the IIgs monitor).

Sounds right.

There is a 3 pin jumper block on my card. It came with the two left
pins shorted. I assume this is used to select which header is used for
output. I'm not sure what the J1 connector is for (just below the work
AMDEK). Would it be for picking up the composite video from the Apple
IIe motherboard? Isn't that what the similar looking 2 pin connector
on the Apple motherboard is?

The jumper may select a mode unrelated to the connector being used.

The only 2-pin Molex connector I remember on the Apple II main board
is the speaker connector (right side, toward user, if the board is
oriented as it would be in a case).

There is a 4-pin Molex connector with video and power on the right side
of the board near the back. This was used to connect RF modulators.

I tried plugging the card into my Apple IIe and thankfully, no magic
smoke escaped. Connecting the card to a CGA monitor gives me nothing
but a blank screen. The Apple composite video works as always.

Does anyone have any thought, suggestions, brilliant ideas, etc. :-)

The 9-pin connector is probably not a CGA pinout, but an Amdek color
monitor pinout. The 16-pin connector is, as you surmised, for a 1:1
(minus pin 16) ribbon cable to a Dx-15 connector for an Apple RGB
monitor.

-michael

******** Note new website URL ********

NadaNet and AppleCrate II for Apple II parallel computing!
Home page: http://home.comcast.net/~mjmahon/

"The wastebasket is our most important design
tool--and it's seriously underused."
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