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⌂ ∞ ▽ Elite on the 6502

Version analysis of PL21

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

Code variations between these versions are shown below.

       Name: PL21
       Type: Subroutine
   Category: Drawing planets

Code variation 1 of 2A variation in the comments only

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

Cassette, Flight, Docked, 6502SP, Master
Electron
    Summary: Return from a planet/sun-drawing routine with a failure flag

    Summary: Return from a planet-drawing routine with a failure flag

Code variation 2 of 2A variation in the comments only

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

Cassette, Flight, Docked, 6502SP, Master
Electron
 Set the C flag and return from the subroutine. This is used to return from a
 planet- or sun-drawing routine with the C flag indicating an overflow in the
 calculation.

 Set the C flag and return from the subroutine. This is used to return from a
 planet-drawing routine with the C flag indicating an overflow in the
 calculation.




.PL21

 SEC                    \ Set the C flag to indicate an overflow

 RTS                    \ Return from the subroutine