Up for sale is this Casio Illuminator Vintage PDA SP-5580 Business Organizer Scheduling System 128KB 

The unit has power, although has not been fully tested - I turned it on and was able to cycle through some options, but I'm not familiar with all the features, it appears to be in working condition. If you have any questions, I would be happy to try to answer them. Scuffs and scratches from use. Batteries not included.