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The primary difference between the two models was expandability, Colleen would include a number of memory slots, monitor output and a full keyboard, while Candy used a plastic "[[membrane keyboard]]" and didn't include any memory slots. Both machines were built like tanks with huge internal aluminum shields, a side effect of meeting a [[Federal Communications Commission|FCC]] specification that was soon to be removed anyway (the first model of the [[TRS-80]] actually never met that FCC spec).
Interestingly, the four “joystick” ports on the front of the machines were actually serial I/O ports (for example, one could run a modem off of a joystick port). Ostensibly these ports accepted joysticks, keypads, paddles, drawing pads, etc.
=== The early machines: 400, 800 ===
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