There is Marty 1 and Marty 2. There is zero functional difference between the two.  Even the motherboards are radically similar.

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Marty has a 386SX Processor, 2MB of RAM that is not upgradable, one floppy drive and a problematic CD ROM drive. It only outputs composite and S-video and it's impossible to modify for RGB output.

Marty 1


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Marty 2

{{:fm_towns:marty2.jpg?400|}}

TC-MARTY is a special edition Marty that is more unobtanium than virgin's breastmilk.  \\
In all seriousness it's quite rare. It was meant to hookup to a scanner and use a special SRAM card with a form of internet access. In the rear there is an attachment meant to hookup to a scanner/printer peripheral.
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{{:fm_towns:tc-marty.jpg?400|}}