Broken MIC port in ZX81???

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yerzmyey
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Broken MIC port in ZX81???

Beitrag von yerzmyey » 18.06.2008, 23:00

Hi, guys.

I would like to ask You for help.
For several weeks I have my own ZX81 at last. http://hooyprogram.republika.pl/zx81.JPG
I had some problems with keyboard but we managed to fix it by ourselves and now it works.

However I'm not sure about its MIC output.
I mean - until now I had only Spectrums. While saving their sound is loud and pretty clear.
But in case ZX81 I don't know if I have a broken MIC port or is it normal for ZX81 (I doubt) that the sound while saving is hardly/barely audible and very noisy (buzzing).
If I would record something like that on a tape, I doubt I would be able later to load it back into ZX81.

The only comparison I have - is to EightyOne emulator (F4=MIC sound on). There the sound is much more clear and audible (although still some noise is noticeable but is stops while saving).

Would anybody be so kind and explain me in a few words if my ZX81 is broken or maybe it's normal for it (??) or - maybe I do something wrong (I use a cable from ZX Spectrum. I admit that when I use original ZX81 cable - veeeeeery short - the sound is a bit stronger but still totally silent).

I will be grateful for Your advices.

Kind regards,
Yerz
http://zx81.republika.pl/
"FERENGI" - an arcade game for ZX81: http://tiny.pl/hp3bq
"MONOCHROME" issue 5 - a NEW (Spring 2014) free paper/PDF magazine about ZX81: http://tiny.pl/q2m44
ZX81 COMPETITIONS 2007/2009: http://zx81.republika.pl/

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bodo
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Re: Broken MIC port in ZX81???

Beitrag von bodo » 21.06.2008, 11:10

Perhaps some of the others with a real machine could digitize a true record in a WAV file and send it to you for comparison? Just a suggestion...
B0D0: Real programmers do it in hex.

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yerzmyey
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Re: Broken MIC port in ZX81???

Beitrag von yerzmyey » 21.06.2008, 20:19

Oh, I would be very grateful.
It would help a lot.
"FERENGI" - an arcade game for ZX81: http://tiny.pl/hp3bq
"MONOCHROME" issue 5 - a NEW (Spring 2014) free paper/PDF magazine about ZX81: http://tiny.pl/q2m44
ZX81 COMPETITIONS 2007/2009: http://zx81.republika.pl/

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