Caleid.01 and .02 system files do not seem to feature anything interesting bitmap-wise at all, which is a major difference from how things are done on Casio BN-20 (that one was full of bitmaps). The Caleid SDK doesn't seem to ship with Caleid built-in software, either; there's no memo or spreadsheet in the OS files.
However, Caleid.03 and Caleid.04 system files hint that there is something called "LCD BIOS" and then there is a tool that asks the user to draw a kanji! Could it be that there's hand-written recognition tooling? In <256 KB of code? 🤔
I'm also extremely curious whether Caleid had a kanji font bank. I guess I might find out soon enough.
(cont)
The sysbin/data folder has multiple files CALEDATA.xx. Files 01-18 are font files. There are 8-pixel wide extended ASCII fonts (including symbols for musical notations - Casio is a musical instrument company!), 8 pixel-wide kanji, 1 pixel-wide kanji and 24 pixel-wide kanji. Some of the fonts are very pretty.
(cont)
I assumed that Caleid SDK didn't ship the full OS - because the SIM3020 immediately boots into the Add-In program - but it seems I am wrong. CALEDATA.20 file has the launcher, coming with the full-sized bitmaps. So pretty T_T
There are place-holders for the pop-up windows, too. What a curious little operating system.
(cont)
The contrast correction UI is something we've seen already, in both Casio BN and Casio PV, but this list of on-screen keyboards (including handwriting recognition keyboard) is something I personally have not seen before in this product series.
(cont)
What is the most optimal way to make a monthly calendar program? Why, of course pre-render the calendar and store it is a bitmap in the ROM.
How ELSE are you going to use all this massive 2 megabyte ROM?
This operating system is something else.
(cont)
CALEDATA.30 stores a different part of the Casio Caleid OS - the applications. It also features the very same images we've seen in our BN-20 BIOS. I'm uploading them here upscaled and colour-corrected.
The "notes" application has lots of different categories of notes: cars, cards, CDs, books, films, and so on.
(cont)
Some more built-in apps in the Caleid OS: "easy sheet" is a spreadsheet program with built-in templates (mortgage, currency converter, GOLF SCORE wtf) and the networking app (computer, electronic mail, FAX).
(cont)
What could be better than a calculator app? Well, of course, two calculator apps! Yes, Caleid has two built-in calculators: one is stand-alone and one is a pop-up calculator. Handy, eh?!
(cont)
Caleid is a "Mobile Navigator", not a "Business navigator", so it has three built-in games.
The last file in the OS, the 300 KB blob CALEDATA.40, doesn't have any non-compressed bitmaps.
Can we run the OS in the simulator? It is shipped with it, after all. Hmm... Let's try! (cont)
Well, actually, I can't think of a way to do so... Maybe some other time.
Anyhow, I've uploaded the Caleid OS and the SIM3020 to the Internet Archive: https://archive.org/details/caladdin/Screenshot%202026-02-01%20at%2015.16.33.png
Grab a DosBox-X with PC-98 support and try it yourself~
Nina Kalinina