Follow up to this for anyone who was interested: the shareware control panel Keyboard2Serial is pretty useful for this kind of thing. If you just direct all of the keyboard input to the printer port, it's very easy to send commands to the Imagewriter II.
You can get that control panel here: http://www.polar-orbit.com/downloads/keyboard2serial.sit.hqx
You might need to contact the developer to get a serial number, because he said he hadn't had an order in 10 years. You can find his contact info here: http://www.luszcz.com/
As for how to make the printer do what you like, definitely get a copy of the Imagewriter II Technical Reference manual (ISBN 978-0201177664) on Amazon -- it is very clear on how to do everything you could want to do with an Imagewriter.
You can get that control panel here: http://www.polar-orbit.com/downloads/keyboard2serial.sit.hqx
You might need to contact the developer to get a serial number, because he said he hadn't had an order in 10 years. You can find his contact info here: http://www.luszcz.com/
As for how to make the printer do what you like, definitely get a copy of the Imagewriter II Technical Reference manual (ISBN 978-0201177664) on Amazon -- it is very clear on how to do everything you could want to do with an Imagewriter.