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That link is for both models, you didn't read through it.

its prety tiny and im gonna add a cartridge port to it. but im also gonna buy a second one and turn it into a portable. i mean, really... how hard can it be?
Umm, you know it's incompatible with about 10% of 2600 games right? Cosmic Ark, Galaxian, Berzerk, Koolaid Man, Robot Tank, Boxing, 16k Ram ...

Copy all you want, it's a free world. You might make a better looking one. I was going to try slipping the Flashback 2 into a ps2 controller with analog stick support.

I've done something like that myself:
www94.pair.com/jsoper/port_2600_main.html