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APPENDIX B
Before the program is loaded the display might look like this:
After the following lines are executed the CRT would appear like this:
OUTPUT
1 0
11
OUTPUT
END
The trace data that would have been shown between display addresses 100 and 500 is omitted and the data for
addresses 501- 1001 is displayed at x positions 100 through 600.
Jump Subroutine (jsb) and Return (rtn).
specified. If the address does not contain a control word, the program skips to the next control word after that
address. The rtn instruction transfers program control to the first control word following the jsb instruction.
ADVANCED DISPLAY PROGRAMMING
The jsb instruction transfers program control to the address
A p p e n d i x 1 9
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