Casio BN-20 ROM dump is in progress. 52 jumper wires is a mess. We seem to have a couple of address bits flipped, because the data looks ALMOST right but not quite, with every 16 bytes out of order.

Our programmer/flasher tool only has 40 pins, so we're dumping upper/lower byte separately.

I guess we'll continue tomorrow, because it's a bad idea to do precise operations when tired, with a risk of destroying the only copy of the chips
And we've struck gold with the ROM. 2 megabyte of ROM, what did Casio put in there? Well, loads of screenshots and a bunch of UI stored as bitmaps, of course.... thread
more bitmaps from teh ROM!
@nina_kali_nina why is there a calculator-calendar?? What does it do?? Is it if you need to do calculations in the titles or events or something? I can't see that being a very popular feature​​ or I guess it could be a dedicated app/feature for calculating the time between dates, maybe there are people who find that super useful in their day to day? Old tech is weird.. :P
@vae maybe it's planned expenses or something... I haven't seen this UI live. Maybe the manual has the answer, I'll check it out later
@nina_kali_nina huh, yeah that might be it I suppose? It's less fun when it makes at least a little bit of sense though.. xD