BTW - I have, somewhere in the basement, the remaining
stock
of Hofacker computer - a (at least in germany) somewhat popular
publishing company, that sold more than 120 books and hundreds
of programms thru the early years - Ohio, TRS, Apple or PET - what
ever - from 1977 until 1984 (?) they also published a magazine.
Oh boy - one of those for the Atari, called 'hackerbook' was
a good referance for writing Atari 8bit device drivers. Sure was fun
to make devices interfaced to the joystick-parallel I/O port
using Hofacker as a guide. It also showed how to make your own
plug in rom carts too, IIRC. Found it in a mall bookstore around
'85.
Chuck
cswiger(a)widomaker.com