1 * (PL$U) REV 1.0 LOW LEVEL INCREMENTAL PLOTTER DRIVER
4 * PROGRAM TITLE: PL$U (PL$U, PL$D, PL$L, PL$R, PL$PU, PL$PD,
5 * PL$UR,PL$UL,PL$DR,PL$DL)
7 * LOW LEVEL PEN PLOTTER ROUTINES
19 * LOW LEVEL PEN PLOTTER DRIVER ROUTINES PROVIDING HARDWARE
20 * ABSTRACTION BY PROVIDING SIMPLE ROUTINES FOR PEN MOVEMENT.
32 * CALL PL$D - STEP DOWN
33 * CALL PL$L - STEP LEFT
34 * CALL PL$R - STEP RIGHT
35 * CALL PL$PU - RAISE PEN
36 * CALL PL$PD - LOWER PEN
38 * CALL PL$UR - STEP UP+RIGHT
39 * CALL PL$UL - STEP UP+LEFT
40 * CALL PL$DR - STEP DOWN+RIGHT
41 * CALL PL$DL - STEP DOWN+LEFT
45 ********************************************************************************
48 PADR EQU '40 PORT ADDRESS OF THE PLOTTER INTERFACE
63 REL THIS IS A RELOCATABLE OBJECT
67 OUT DAC ** DO THE MOVEMENT