Here's a die shot: https://seanriddledecap.blogspot.com/2017/07/blog-post_8.html

I count 81 pads and maybe 320 nibbles of RAM, so maybe a big brother to the HT443A0?

The ROM is mostly obscured by traces, but I can't see any bits in the open areas, anyway.

Most of the segment outputs are unused for DKJR Mini.