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⌂ ∞ Elite on the BBC Micro and NES

Version analysis of SETYC / DOYC

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

Code variations between these versions are shown below.

Code variation 1 of 5A variation in the comments only

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

Master
6502SP
       Name: DOYC

       Name: SETYC

       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 row

    Summary: Implement the #SETYC <row> command (move the text cursor to a
             specific row)

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 #SETYC <row> command. It updates
 the text cursor y-coordinate (i.e. the text row) in YC.

 Arguments:

   A                    The text row

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
.DOYC

.SETYC

 STA YC                 \ Store the new text row in YC

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