Debug audio input altairclone with Oscilloscope

[barjammar]

I have obtained useful images of cassette data input as shown in these images on the web.
http://bajama.mine.nu/~barry/hardware/A ... index.html
If you see a closeout sale at Radio Shack, grab one of these desktop digital recorders.
Barry

[gio74]

wouldn't be easier to take the measure at the mini jack out?

[barjammar]

You are correct but I had it open anyway. Why don't you post a block diagram of the IO with pin outs and test points?
Thanks

[toml_12953]

Thanks for the tip about the digital recorder! I'm using one now and it is more reliable than using analog tapes. Not bad for $4.95 at Radio Shack!