The 4-Bit Microcomputer Kit from the Maker Shed features a 20-key keypad, a 7-segment LED, and 7 individual LEDs. It comes pre-programmed with 7 different applications, and you can even program your own via the keypad. It’s a fun retro kit, just begging to be hacked! Don’t forget to check out Gakken magazine 4-bit computer rollout party in Tokyo.

Maker Shed

Maker Shed

The Maker Shed is brought to you by Maker Media, the makers of MAKE Magazine, the Maker Faire, and much more.

Launched originally as a source for back issues of MAKE Magazine, the Maker Shed expanded rapidly to meet the demand for ‘projects in a box,’ otherwise known as kits. Now we have a little bit of everything for makers, crafters, and budding scientists, from Arduinos to sock monkeys to chemistry sets .

  • MadRat

    I’ve seen some hacks for these on YouTube. One guy connected each keypad switch to relays and those to a USB port plugged into his computer for easy programming ( Several other people have done similar projects. Another guy created a manually operated tape reader ( There seems to be a lot of other stuff but it’s written in Japanese, which I can’t read.

  • Marc de Vinck

    Those are great projects. Thanks for the links.

    The description on the gmc4loader translates : (via Google)

    “I made reference to the GMC-4 program load device. USB came up to get the 78K0 microcontroller. Metronome first, and then scroll left to load the LED starts.”

    Looks like a binary counter?