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Pre-Launch Routine Mode
Provides the instructions required to check out the computer prior to
launch and to read in special data for future use. This routine performs
sum-checks on all sectors within the computer memory. These checks are
performed by adding the contents of all memory addresses within a sector
and comparing the sum with a pre-stored constant. If the constant and
the sum are not equal, the computer malfunction latch is set by program
instruction PR034. If the sum check is successful, special data is
stored in predetermined memory addresses by the common subroutines.
These subroutines are discussed in later paragraphs.