coln@hpl-opus.HP.COM (Mike Coln) (05/20/88)
For a good general reference on the CP/M operating system (and assembly extensions) I would suggest "The Programmer's CP/M Handbook" by Andy Johnson-Laird. It is published by McGraw-Hill, copyright 1983, ISBN 0-88134-103-7 (paperback) 0-88134-119-3 (hardback). Mike Coln