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APPENDIX B
carriage return (CR)
space (SP)
A blink on (bkon) will cause blinking of everything drawn on the display until a subsequent blink off (bkof) or an
end of display (end) instruction is encountered with program execution.
cause
A skip 16, 32, or 64 will
64, respectively.
Note that these functions will work for both the lb1 instruction code (1025 + ) or the LB command.
PROGRAMMING WITH DISPLAY CONTROL INSTRUCTION WORDS
These examples illustrate the use of display control instructions and data words. The display memory commands
described at the start of this appendix are used for loading and reading.
Vector (vtr)
Instructions can be used to draw lines on the CRT display. The data words each determine whether the data is
plotted absolute/relative or blanked/unblanked (pen up/pen down). The auxiliary functions apply to the vector
instructions.
For example, a line is to be plotted on the display with plot relative instructions in trace C memory beginning at
address
3072
3073
3074
3075
3076
I
program execution to go to the next address that is an integer multiple of 16, 32, or
description
vector
x = 450 absolute
y = 450 blanked
x = - 100 relative
y = + 100 relative
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ADVANCED DISPLAY PROGRAMMING
13
17
18
32
145
146
147
program
vtr
450 + 0
450 + 2048
(1024 - 100) + 2048
100 + 0
word
1026
450
2498
2972
100
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A p p e n d i x 1 3
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