[sebhc] H8-5

dwight elvey dkelvey at hotmail.com
Mon May 22 21:47:55 CDT 2006

>From: Carroll Waddell <carrollwaddell at sc.rr.com>
>At this point, all I'm trying to do is make the H8-5 think something else 
>is a cassette player.
>I'm trying to feed the H8-5 AUDIO INPUT with tones just like the sound 
>coming from a cassette player.
>The audio from an actual cassette is not sync'd to anything. The PLL on the 
>H8-5 creates the clock from the audio coming from the cassette player.
>I haven't started to try to create the WRITE half of the project yet. I'm 
>still just trying to make the H8 think I have an actual cassette player 
>with a tape to load in it.

Hi Carroll
One other thing to try is that the complete system with tape recorder
included assumes some rolloff is needed to send to the tape recorder.
If you look at the output of the H8-5 should see a resistor/capacitor
filter. Your circuit should match this before sending data to the input
of the H8-5. The H8-5 is expecting to compensate for this filter.
How many cycles of tone are used for the input? I have a Poly88
tape input that is sensitive to the polarity of the audio coming in.
You might look at inverting the data as well.
One last thing. You might check that it still works with a real cassette.
It just might be that it has died.

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