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   Re: How do you make a datasette for the c64?  more options
   
   
   Author:   John Iannetta
   Email: 73510.2152@CompuServe.COM
   Date: 1999/01/15
   Forums: comp.sys.cbm
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   _________________________________________________________________
   
    Daniel Morrow said,

"Any way to find out the correct polarity for those two items or would that one
transister inverter take care of all of that...?".

    The write and read functions are independent.  Either one or both may need
an inverter; probably the best way to find out is trial and error.  Try to read
from a pre-recorded Datassette tape; if you get garbage, an inverter may be
needed.  Try to write to a tape; if you get garbage when you try to read it on
a Datassette recorder, you may need an inverter for the write function.

---------------------------------------
WRITE FUNCTION
----- --------
                            D-4 of C-64
                            Datassette
                            connector

recorder              i---------o
earphone              I
jack              I   I
                  I---!
o---o---------o---I     2N3904
    I         I   I->-i
    I         <   I   I
    I      10 <       I
    I     ohm <       I
    I         <       I
    I         I       I
    o--I<-----o-------o
                      I
      1N4148          I
                      o
                     GND
---------------------------------------
READ FUNCTION
---- --------               +5 VDC
                              o
                              I
                              I
                        I     I
                        I-<---!
                i-------I      2N3906
                I       I-----i
                <       I     I
                <  2.2        I
E-5 of C-64     <  kohm i-----o
Datassette      <       I     <
connector       <       I     <  3.3
                I       <     <  kohm
o---------------i       <     <
                   2.2  <     <
                   kohm <     I
                        <     o
                        <    GND
                        I
                        o-------o                               I    recorder
                        <    microphone
                        <    input
                   100  <
                   ohm  <
                        <
                        I
                        o
                       GND
---------------------------------------

--
I pressed RETURN, and the message said, "Missing GOSUB".

                          John
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