LISTING FOR  >spec>on>11/30/82>dm1521.ctl
COMPILED BY Multics LISP Compiler, Version hc9.2, June 5, 1981
ON 11/30/82  1529.0 mst Tue
IN BEHALF OF Holmstedt.SysMaint.a



;;; ***********************************************************
;;; *                                                         *
;;; * Copyright, (C) Honeywell Information Systems Inc., 1982 *
;;; *                                                         *
;;; * Copyright (c) 1978 by Massachusetts Institute of        *
;;; * Technology and Honeywell Information Systems, Inc.      *
;;; *                                                         *
;;; ***********************************************************
;;;
;;;
;;;       DATAMEDIA 1521 control package
;;;       Adapted from vip7200ctl by Richard Q. Kahler 7/10/79
;;;

(declare (special X Y screenheight screenlinelen tty-type))
(declare (special idel-lines-availablep idel-chars-availablep))


; Initialize terminal and terminal control package.
(defun DCTL-init ()
       (setq idel-lines-availablep nil idel-chars-availablep nil)
       (setq screenheight 24. screenlinelen 79.)
       (setq tty-type 'dm1521)
       (Rtyo 14)                                  ;clear screen
       (setq X 0 Y 0))


; Move terminal's cursor to desired position.
(defun DCTL-position-cursor (x y)
       (cond ((and (= x X)(= y Y))
              nil)                                ;already there
             ((and (= x 0)(= y 0))
              (Rtyo 31)                           ;cursor home
              (setq X 0 Y 0))
             ((and (< (+ (abs (- X x))(abs (- Y y))) 4))
              (cond ((< X x)
                     (do ex X (1+ ex)(= ex x)(Rtyo 34)))    ;cursor right
                    ((< x X)
                     (do ex x (1+ ex)(= ex X)(Rtyo 10))))   ;cursor left
              (cond ((< Y y)
                     (do wy Y (1+ wy)(= wy y)(Rtyo 12)))    ;cursor down
                    ((< y Y)
                     (do wy y (1+ wy)(= wy Y)(Rtyo 37))))   ;cursor up
              (setq X x Y y))
;; Direct Cursor Addressing is best.
             (t (setq X x Y y)
                (Rtyo 36)(Rtyo (+ 40 x))(Rtyo y)
                    )))


; Output string.
(defun DCTL-display-char-string (string)
       (setq X (+ X (stringlength string)))
       (Rprinc string))


; Clear to end of screen.
(defun DCTL-clear-rest-of-screen ()
       (Rtyo 13))


; Clear to end of line.
(defun DCTL-kill-line ()
       (Rtyo 35))

			Functions Defined

Name			Offset		Offset		Name


DCTL-clear-rest-of-screen        266		   0		DCTL-init
DCTL-display-char-string         252		   34		DCTL-position-cursor
DCTL-init                        0		   252		DCTL-display-char-string
DCTL-kill-line                   276		   266		DCTL-clear-rest-of-screen
DCTL-position-cursor             34		   276		DCTL-kill-line





			Functions Referenced

Rtyo                                    Rprinc                                  stringlength


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

                                          -----------------------------------------------------------

Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved