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Hi,does anyone have a link or the schematic of the "RTTY-INTERFACE" card for the Apple II?
Anonymous
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I'm not sure where the photo came from but if someone has this card, I would be happy to reverse-engineer it.
I have some RTTY software for it (I believe) but no way to tell for certain if it was made for this card.
I don't have a schematic but found this right now...
https://www.ebay.de/itm/295696417698?mkevt=1&mkcid=1&mkrid=707-53477-19255-0&campid=5338722076&customid=&toolid=10050
Not sure if this is functional or to expensive... and it's not my offer.
Kind regards, Torsten
Update: and I just found these articles:
https://archive.org/details/73-magazine-1981-04/page/66/mode/2up
https://archive.org/details/73-magazine-1982-10/page/34/mode/2up
Have fun
Believe it or not, there's enough information contained from that eBay auction to make a schematic.
I'll work on this over the coming weeks. Torsten, this is a good find and thanks for sharing!
The photos are detailed enough to identify nearly every part (like 95 percent) and it's an obvious single sided board that draws +12V power from the Apple II to run it.
The Header becomes the interface to the Computer and does it's RTTY magic from there. The circuit doesn't need to reside on an Apple II card to function as long as the Gnd connection is common to the computer.
There's not much more I can determine without drawing it up. More to come...
The photo I published comes from the EBAY announcement.The seller declares:-"No manual but can be found on internet", but I couldn't find anything...Naturally the seller did not respond to my request for the link.Without manual and software it's just a paperweight! :(
With paint.net it is possible to overlap the 2 layers and adjust the opacity
RRTY-INTERFACE F.jpg
RRTY-INTERFACE R.jpg
Not exactly what you are looking for but I put Dr Galfo's software on documentation online some time ago.
https://www.willegal.net/digitalradio/Galfo-HAM-App.html
It includes support for morse, RTTY, SS-TV and the documentation has a schematic.
Before I discovered Dr Galfo's software, I worked for a while on my own solution.
I used a HAL communications ST-6 demodulator. The ST-6 interfaces to a TTY at 45.45 baud. I used an old Apple Serial card which was designed to interface to a TTY and coded my own bit banged driver so I could revcieve at the slow baud rate. There are two voltage levels used with TTY, and I had to do a bit of hardware hacking to make the ST-6 interface voltage compatible with the Apple II. I was able to receive RTTY traffic here on the East Coast of the USA. Most exciting to me, was the time I picked up a museum submarine located in Spain. I never put enough time in to get the transmit side fully working.
-Mike
You are absolutely right: no signals are present in the connector for the slot.The card is irrational: the LEDs/switches and the connections with the RX/speaker force you to keep the case open: better to create an external circuit if it's possible to find some application SW...
This is a paperweight! :)