Re: Request for info on Apple II Video Overlay Card

[roughana <andrew.roughan@writeme.com>]

On Jan 14, 2:48 am, Lukazi <luk...@hotmail.com> wrote:
> I purchased an Apple II Video Overlay Card recently but it did not
> come with any of the cables.
>
> Does anyone know where I may be able to find information such as the
> cable lengths and pictures of the cable ends? Schematics maybe?
>
> Does the manual "Apple II Video Overlay Card Owner's Guide" have all
> of this information in it?

No it does not. Neither does the "Apple II Video Overlay Card
Developer Notes" - Although it does provide a functional block diagram
of the VOC and a pinout for the Video Expansion Bus connector on the
front edge of the card.

For posterity (nothing uses it that I know about) the AVEB pinouts
are:
1 /SQRFILTERENA
2 NC
3 /RGBENA
4 NC
5 RIN
6 NC
7 GIN
8 Gnd
9 BIN
10 Gnd
11 KEYIN
12 Gnd
13 /HSYNC
14 /VSYNC

However, "Apple II Video Overlay Card Developer Notes" does say
"The RGB output connector on the Apple II VOC corresponds to the
standard Apple IIgs DB-15 pinout converted to a ribbon block
connector. Consult Chapter 4 of the Apple IIgs Hardware Reference
Manual for details on the DB-15 connector."

The RGB cable is 16cm long including the pin block and db-15 block.
The Video cable is also a similar length. It goes to two RCA jacks.
The top jack is In and the bottom is Out. There appears to be only
three wires in this cable. It is a ribbon style cable but there is
extra plastic between each wire and the cable itself is stiffer than a
regular ribbon cable. My attempt to determine which pin went where was
inconclusive, but I will try an alternate method if necessary.

My card has numbers 820-0236-03 and 670-0236 A. I hope that's a PAL
card, but I don't know for sure.

Regards,
Andrew