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Build your own Data Cassette Cable for your TRS-80.

Cassette Interface Revealed! - by: Brian K. Hahn


There is something very entertaining about loading and saving programs

onto a simple cassette recorder.  One of the first commands you learn in

basic are the CLOAD, for (cassette load) and CSAVE for (cassette save)

syntax.  After all, if you don't master these then writing programs in Level 1

or Level 2  Basic was mute.  That is unless your were rich enough to buy a

disk drive.  In any case, when I pull out my TRS-80 Model I or CoCo

waiting as the curser blink with abating breath is a real hoot.  That is of

course as long as your volume on the cassette deck is not to high or the

tape is not too noisy. 


It is also interesting to note, that in those days long ago, the interface

cable that connected a simple cassette tape to your personal computer

was for the most part built around some industry standards.  I found that

Tandy / TRS-80, and many other brands, all used the same cable.   So if

you are lucky enough to rummage at a garage sale or flea market you may

still find one intact.  If one is not found, just build your own by following our



Before we start, I want to make sure you all know that the 'data recorder' sold for your old vintage machines, like the

TRS-80 CCR-81 and CCR-81 are just plain old mono shoe box tape recorders.  So start digging downstairs and find

your Lloyds, Sears, JIL, Candle or Sanyo tape recorder for this project.  They will do just fine.  The only requirement

is that they all have the proper ports on the side, which they all do.  It is very rare for them no to have the standard,

EAR, AUX, REM and MIC ports.  (See Pic)


The standard data cassette interface cable consists of one 5-PIN DIN male plug (Radio Shack

Part Number 274-003), one 2.5 mm male mono phono plug, and two 3.2 mm mono male phono



The DIN connector consist of 5 PINS apply numbered 1 through 5, and the mono phono plugs are

simple two contact connectors, where the tip is the data contact the preceding barrel is the

ground.  Wires are connected to these point using a soldering pencil and solder.  DO NOT try to

accomplish this project using screw connectors, or wire wraps.  You run the risk of creating a short circuit, and the

cable will not work.


You will also need either a number 20 to 22, 6 lead cable or three 18 to 22, 2 lead cables, preferably two to three feet

long.  With your connectors, cables, solder and soldering pencil before you, you have all you need to build your own

data cassette cable.


Connecting the wires is a simple task of connecting to the right contact on the phono pugs while connecting the

corresponding contact of the DIN plug.  The schematic above illustrates the proper wiring.


Give this project a try, and then pull out your old TRS-80, and Cassette Recorder, drop in a tape, and fire up Basic. 

Then call over the neighbors and show them just how far you really have come.  They will me marveled!  As least you

will have impressed us.  Good Luck and enjoy.




(c) 2004, 2005, Brian K. Hahn

 All Rights Reserved.