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//GO.SYSIN DD *, DOODAH, DOODAH

Consider the postage stamp: its usefulness consists in the ability to stick to one thing till it gets there. — Josh Billings

Alexander Graham Bell is alive and well in New York, and still waiting for a dial tone.

I’ve noticed several design suggestions in your code.

Real programmers don’t write in BASIC. Actually, no programmers write in BASIC after reaching puberty.