Version analysis of TT66 - Elite on the 6502

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

Cassette, Disc (flight), Disc (docked), 6502 Second Processor, Master and Electron

Code variations between these versions are shown below.

       Name: TT66
       Type: Subroutine
   Category: Drawing the screen
    Summary: Clear the screen and set the current view type


 Clear the top part of the screen, draw a border box, and set the current
 view type in QQ11 to A.


 Arguments:

   A                    The type of the new current view (see QQ11 for a list of
                        view types)

Code variation 1 of 3A variation in the comments only

This variation is blank in the Disc (flight), Disc (docked), 6502 Second Processor and Master versions.

Cassette, Electron
 Other entry points:

   TT66-2               Call TT66 with A = 1

Code variation 2 of 3Minor and very low-impact

This variation is blank in the Disc (flight), Disc (docked), 6502 Second Processor and Master versions.

Cassette, Electron
 LDA #1                 \ Set the view type to 1 when this is called via the
                        \ TT66-2 entry point

.TT66

 STA QQ11               \ Set the current view type in QQ11 to A

Code variation 3 of 3A variation in the labels only

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

Cassette, Flight, Docked, 6502SP, Electron
Master
                        \ Fall through into TTX66 to clear the screen and draw a
                        \ border box
                        \ Fall through into TTX66K to clear the screen and draw
                        \ a border box