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TI-99/4a Audio Spectrum Analyser


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7 minutes ago, jrweikle said:

any information about this cart out there. I assume it used the cassette port for input.  is there a dump of this cart or does anyone have one they wish to part with? 

I am familiar with the eBay auction which triggered this question.  That is a CoCo cart, not a TI cart. 

 

https://ebay.com/itm/176291827329

Screenshot2024-03-19at14-59-35TexasInstrumentsTI-99_4aAudioSpectrumAnalyserCASEONLYeBay.thumb.png.297d48a9a32d5bf4b95fdf13572dae14.png

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LOL, if there is no board maybe we could 'CREATE' a program/ROM and circuitry to make a NEW board. Here is a project for someone, if there are no takers, I guess I will start investigating the possibilities. Back in 1986 I wrote a sampling assembly routine for the cassette port, it sampled any audio files into a 8K, if I find my listing this would be a good start. Regards Arto.  

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  • 2 weeks later...

Haha! Took me some time to find it...8)

 

Here's Version 1, from a text document in my possession, source UNKNOWN.

*SOUND ANALYZER 1 *
*******************
*DISPLAYS SOUND INPUT FORM CASSETTE
*PLAYER ON MONITOR SCREEN

       REF VSBW *REFERENCE VIDEO WRITE
       DEF RUN *DEFINE PROG START
RUN    CLR 0
B      LI 1,>1E00
       TB 27
       JNE C
       AI 1,>100
C      BLWP @VSBW
       INC 0
       CI 0,>300
       JNE B
       JMP RUN
       END
       

I typed this in... FORM[sic].

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