Version analysis of SETXC / DOXC

This code appears in the following versions (click to see it in the source code):

6502 Second Processor and Master

Code variations between these versions are shown below.

Code variation 1 of 5A variation in the comments only

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Master
6502SP
       Name: DOXC
       Name: SETXC

       Type: Subroutine
   Category: Text

Code variation 2 of 5A variation in the comments only

Tap on a block to expand it, and tap it again to revert.

Master
6502SP
    Summary: Move the text cursor to a specific column
    Summary: Implement the #SETXC <column> command (move the text cursor to a
             specific column)

Code variation 3 of 5A variation in the comments only

This variation is blank in the Master version.

6502SP
 This routine is run when the parasite sends a #SETXC <column> command. It
 updates the text cursor x-coordinate (i.e. the text column) in XC.

 Arguments:

   A                    The text column

Code variation 4 of 5A variation in the labels only

Tap on a block to expand it, and tap it again to revert.

Master
6502SP
.DOXC
.SETXC

 STA XC                 \ Store the new text column in XC

Code variation 5 of 5Related to Elite's use of the Tube

Tap on a block to expand it, and tap it again to revert.

Master
6502SP
 RTS                    \ Return from the subroutine
 JMP PUTBACK            \ Jump to PUTBACK to restore the USOSWRCH handler and
                        \ return from the subroutine using a tail call