Arduino and other electronics projects info

i found this lightbox without keyboard as the second hand store. i thought i'd see what i could do.

There's hardly any info on the Cresta AS-0216.

The websites i found, looking like the same (or similar) device;

• a Chilong "Ad-Pro AS-0216" https://www.amazon.com/AD-PRO-AS-0216-PROGRAMMABLE-LED-SIGN/dp/B00UDNDG6O
• a Brandless AS-0216 https://www.elektroda.pl/rtvforum/topic1584838.html
• This blog https://www.circuitsonline.net/forum/view/30396/1#highlight=cresta in search for AS-0216 material refers to http://www.kingpul.com.tw/ but that domain is no longer active.
• "Kingpul" brand website can only be seen via the internet-archive; https://web.archive.org/web/20051214082253/http://www.kingpul.com.tw:80/rh216r.htm lists the type "RH-216R" which seems comparable. But no manual is downloadable
• "Sigma ASC 333" is mentioned here https://www.hetlab.tk/artikelen/lichtkrant-protocol and states it is similar to the "Cresta RH-0214CR". This one has software for windows 95 available, and i could download the manual (via https://web.archive.org/web/20160904131325/http://anseyang.myweb.hinet.net/214CR.htm )
• https://elektrotanya.com/sigma_asc_333,as226_fenyujsag_software.zip/download.html It refers to this Kingpul site as well (only still internet archive) https://web.archive.org/web/20160904131325/http://anseyang.myweb.hinet.net/214CR.htm
• Someone tried some things on an AS-0216 http://www.nerdkits.com/forum/thread/1256/
• "HiTech AS-0216" is also one of it's names; https://forum.arduino.cc/t/controlling-a-old-school-led-message-sign-hitech-as-0216-with-a-uno/367646

There's a blog about a repair of a Cresta-0216;

• https://www.markgrob.nl/2021/04/cresta-as-0216-repair/comment-page-1/ But that device has a different print than mine.

My device looks like this (pictures can be enlarged by clicking):

i'll be posting some update if i have them