Program Checkout Routine - IBM 1800 Operating Procedures Manual

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single step switches. Verify that both carriage and
drum move only one step each time the respective
switch is operated.
8. With carriage positioned near right side, set carriage
fast run switch to left and drum fast run switch to
DOWN. Allow pen carriage to run until it reaches
left side; then turn both switches to off (center)
pcsiticr:. Verify th:lt pen tr:lces a 45° linf?
9. Operate drum single step switch several times in same
direction. Turn carriage fast run switch to right and
drum fast run switch to UP. When carriage reaches
right side, turn both switches off. Verify that pen
traces another 45° line parallel to the line previously
traced.
10. Repeat steps 8 and 9, changing switch settings to pro·
duce two 45° lines at right angles to first two lines.
PROGRAM CHECKOUT ROUTINE
Step 1.
Final Result
Properly Aligned
56
IBM 1800 Operating Procedures
Step 2.
Final Result
I mproperly AI igned
Many plotter programs contain a checking routine which
provides a graphic representation to replace feedback
checks used in other output units.
The logic of a program check is simple:
1. Plot a plus symbol (+) at the start of the program
(outside the graph area).
2. Return to this location at the end of the program to
superimpose an (x) over the plus symbol.