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General Purpose Registers


     Fourteen General Purpose Registers are available for use by
     an IRL program.  They are divided into four string
     registers and ten numeric registers.

     The four string registers are labeled $0, $1, $2, and $3.
     They are alphanumeric registers with a maximum length of
     128 characters.  Register $0 is the default for all I/O and
     storage functions.  Commands are provided for concatenation
     and subdivision of these registers.  The string registers
     are cleared when the program begins execution.

     The ten numeric registers are labeled #0 through #9.  They
     are positive integer registers with a maximum value of
     9,999,999.  The contents of these registers can be
     converted to or from string registers.  Commands are
     provided for addition, subtraction, multiplication, and
     division of these registers.  The numeric registers are
     initialized to 0 when the program begins execution.  The #0
     numeric register is also used to return status on several
     I/O commands and the convert command.