Digital BW, The Print

Can Anyone explain. 
Two days ago I thought myself to be the only one who wanted to make 
nice B&W prints. One worflow I´ve tried is to convert my picture to 
grayscale, adjust it and convert it into bitmap using diffusiongitter 
(don´t know the english term for it) with 1000 dpi (Photoshop). The 
result on screen is very similar to what I want: tiny, tiny dots of 
pure black where the eye hardly can see the grain. The output from my 
printer (Epson 1290) however is very coarse regardless of how the 
printers resolution is set.
Is there a conflict with the printers inherent screen and would a RIP 
be something that could solv this problem.
Many thanks for all answers that will help me understand.

Emilio