80-column text card

[tezza]

Hi Guys,

Is anyone able to help me with advice on how to use 80-column text cards in an Apple II+ (or clone).

I inhertited 4 of these but there are no docs available. The only docs I can find in the Net are ones which discuss the use of similar cards in the Apple //e, not a II+. I did find one set of docs for a card for the II+, but the card looked quite different.

Here is the card in question (all 4 look similar).

My research so far indicates these should go in slot 3, and typing PR#3 at the DOS prompt will activate the card. Is this correct? If so, how can you activate them under CP/M?

More importantly, are the 6 connectors in the lower right hand corner suppose to be connected to anything? The other three cards have only two pins, not six? Is the card suppose to be connected to the video pin in the motherboard and also to a separate RCA socket which is then plugged into the screen?

I could just try it, but I don't want to blow anything up. Any ideas?

Tez

 

[david__schmidt]

My research so far indicates these should go in slot 3, and typing PR#3 at the DOS prompt will activate the card. Is this correct?

Yes.

If so, how can you activate them under CP/M?

Not sure about that, sorry.

More importantly, are the 6 connectors in the lower right hand corner suppose to be connected to anything?

Yes. An RCA jack leading to a nice green screen monitor.

The other three cards have only two pins, not six?

That makes figuring out which two go to the RCA jack much easier.

Is the card suppose to be connected to the video pin in the motherboard and also to a separate RCA socket which is then plugged into the screen?

I've seen both types, especially for the euroapples... but I have 80 column Videx cards that just go from the header on the card to an RCA jack completely separate from the video out of the Apple.

 

[tezza]

Ok Dave, I've got this sussed.

With the 80 column cards I have, you put them in slot 3, and connect an RCA socket up to the two top pins. You then plug the screen into this socket. When the computer boots, it identifies a video device as being in the slot and displays the 80 column video. The display will show either your Apple DOS or CP/M if you are using a softcard.

Tez