Hello to all AF-members,
I have bare PCB of RGB Card and i´m searching for information about this card:
searching for manual, schematic, detail pictures of populated card, partlist
any kind of information enableing the population and assembly of that card
and if needed the software distributed with the card or epromcontent?
Here first the images of the scanned bare PCB:
Componentside:
Soldering side:
here is a guess of the component layout without the missing values and the still missing other components:
Maybe the PCB is a prototyp of a RGB Card that was later made with slight changes in the layout....
The remarkable points to identify the Card will be:
1) it is equipped with Eprom or static RAM ( that´s rare at RGB cards and indicates some kind
of software driven decoding )
2) it seems to have also 2 pieces of static RAM like 2114 for temporary storage of Videodisplay...
3) it has rather large pin - array for plugging the cable to RGB
4) probably in later development the prototyping area has been left away.....
any help appreciated....
sincerely speedyG
The Card has no address or data lines from the bus.
I would suspect that the card takes the NTSC-Signal and decodes it to get RGB.
An EPROM (or PLA?) would be used for a pattern-decoding of the NTSC-signal.
The layout of the RGB-connector has 5 (or 6) signal lines and could mean digital RGB or analog RGB.
The extensive use of transistor logic near the a2-bus would indicate analog RGB.
Maybe the double row RGB connector could be used for a daughter board as well?
As i have gotten the card from someone who gave me several IBS pre-production cards, its most likely a prototype ...
I hope you have better use for the card than i
-Jonas