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1.
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Having unwanted duplicate names (labels) for user defined
functions in memory because  fPRGM wast not pressed in
W/PRGM mode before keying in a program.
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2.
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Inadvertently erasing a program in memory by inserting a magnetic
card when W/PRGM—RUN switch is set to RUN.
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3.
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Inadvertently erasing a program on a magnetic card by inserting an
unprotected magnetic card when W/PRGM—RUN switch is set to W/PRGM.
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4.
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Keying unwanted operations into program memory because the W/PRGM—RUN switch is
set to W/PRGM when keys are pressed.
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5.
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Failing to shift up to a gold function (f or f-1) or
down to a blue function (g) because prefix key was omitted.
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6.
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Losing the T-register contents because the entry of a new number or the recall
of a register lifts the stack.
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7.
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Destroying the contents of register R9 because a trigonometric
function, a relational test, or the rectangular-polar conversion was done.
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8.
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Failing to take account of a merged code and to provide a NOP as
filler in a two-step skip.
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9.
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Performing a trigonometric function in the wrong angular mode.
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10.
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Mistakenly trying to call user defined functions labelled 0,
. . . , 9. Only A, . . . , E can be used to label or call
deleted functions.
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11.
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Forgetting to clear flags before using them.
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12.
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Expecting gLSTX, stack, or registers to remain unchanged after calling a
user defined function from the keyboard (letters A, . . . , E)
or within a program.
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