Untitled attachment
https://files.mastodon.social/media_attachments/files/112/176/362/075/180/296/original/f11b7d7f2a57db8b.png
Ok, a big hint came with the map mode from Magic Pockets. It's a high res EGA mode 640x350, but with a custom palette in VGA mode:
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.