Version analysis of JSTK - 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.

.JSTK

 SKIP 1                 \ Keyboard or joystick configuration setting
                        \
                        \   * 0 = keyboard (default)
                        \
                        \   * &FF = joystick
                        \
                        \ Toggled by pressing "K" when paused, see the DKS3
                        \ routine for details

Code variation 1 of 1A variation in the comments only

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

Electron
                        \
                        \ Although this option is still configurable in the
                        \ Electron version, joystick values are never actually
                        \ read, so this option has no effect, though the chart
                        \ views do still run the joystick code, so switching to
                        \ joysticks moves the chart crosshairs in an
                        \ uncontrollable way (which is presumably a bug)