This is a pocket computer (ポケコン) that was used in the electrical engineering department of a technical high school. It's a product from about 30 years ago. I found it while cleaning up my parents' house. I put batteries in and confirmed that it turns on and can switch to each mode. The keyboard seems to be working fine, but I haven't checked everything. If anyone is interested in using it, I'm willing to sell it. The price is almost entirely for shipping and handling, so please refrain from asking for a discount. If you have any questions, please leave a comment.