View Full Version : WTB TI-74 or TI-95 Cassette Interface (CI-7)

January 5th, 2016, 10:15 AM
If you have a Cassette Interface, CI-7 for the TI-74 and TI-95, you'd be willing to sell, please contact me!


Tom Lake

January 6th, 2016, 08:33 AM
You can pick one up here:

They also have the PCIF, but if you're after that, you might look at building your own. Schematic is here: ftp://ftp.whtech.com/hexbus_cc40_ti74/PC_Interface.png if you're handy with soldering iron!

May 2nd, 2017, 09:45 PM

I'm also looking for this cable. I don't want to deal with PCIF, I just want to save programs to tape, possibly to an MP3 recorder.
But I do not have the CI-7 interface cable.

I've tried hocking my oscilloscope up to the pins on the TI 74. Using the ground pin and pin 6 I see what looks like a digital signal when I attempt to save a file.

Could I just connect this signal to audio-in on a tape player and save the file?

If I want to send a program to the calculator, which pin should I send it too?

Or is it more complex than that?