This machine is rare in the states, though you might come across the US released version called the NEC Trek.

It uses a Z80 and Motorola 6847 for graphics. Like a TRS-80 CoCo. Has a good sound chip and 2 joystick ports.

Although a Japanese system, I'll provide (links) to my Google Drive full of articles like how to build a SD Card storage device and memory up

Just look at that brown color... and orange chicklets?! You know you want this on your shelf.

http://r.ebay.com/Gfj6l0