Casio CT-650 - how to set it up?

[Aristotle]

I have recently resurrected an old (about 20 years) Casio CT-650 keyboard but it seems impossible to find a user manual for it. Some of the basic tones are really quite good, like the 'jazz organ' - very smooth and the keys are light and fast. Basically I would like to switch it on and be in the 'jazz organ' mode by default. Also it switches off after about 5 minutes if it receives no action and it would be nice to set this time out for much longer. It seems also that when it has a live midi cable connected it stays on all the time. If anybody knows about this machine I would be grateful for any advice.