Casio Business Navigator BN-20 hacking thread, part 1

A bit over a month ago our friend @kauzereiKauz stumbled upon a broken organiser and brought it home as a potential keyboard donor for a cyberdeck. The organiser ended up booting up. It didn't have any options to install any new programs, but it had a PCMCIA port.

I looked the model up, realised that it might be a 8086-based device, and called dibs on it. A few days ago I finally got my hands on it.

As it happens, the device is based on an embedded version of NEC V30 with an on-chip LIM EMS, and comes with 2MB ROM, 1MB program flash, 2MB user flash, and 128KB RAM. It seems to be somewhat related to the Casio PV series, but we don't know how much software it shares with it.

The standard software includes a calendar, a simple text processor, a spreadsheet editor, and a fax/modem. Let's hack it?~

The first order of business, though, is fixing the keyboard: some of the keys are not working.

🧵