Text: TT11

       Name: TT11                                                    [Show more]
       Type: Subroutine
   Category: Text
    Summary: Print a 16-bit number, left-padded to n digits, and optional point
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * pr5 calls TT11


 Print the 16-bit number in (Y X) to a specific number of digits, left-padding
 with spaces for numbers with fewer digits (so lower numbers will be right-
 aligned). Optionally include a decimal point.


 Arguments:

   X                    The low byte of the number to print

   Y                    The high byte of the number to print

   A                    The number of digits

   C flag               If set, include a decimal point


.TT11

 STA U                  \ We are going to use the BPRNT routine (below) to
                        \ print this number, so we store the number of digits
                        \ in U, as that's what BPRNT takes as an argument

 LDA #0                 \ BPRNT takes a 32-bit number in K to K+3, with the
 STA K                  \ most significant byte first (big-endian), so we set
 STA K+1                \ the two most significant bytes to zero (K and K+1)
 STY K+2                \ and store (Y X) in the least two significant bytes
 STX K+3                \ (K+2 and K+3), so we are going to print the 32-bit
                        \ number (0 0 Y X)

                        \ Finally we fall through into BPRNT to print out the
                        \ number in K to K+3, which now contains (Y X), to 3
                        \ digits (as U = 3), using the same C flag as when pr2
                        \ was called to control the decimal point