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Elite on the BBC Micro

Version analysis of ABORT2

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

Code variations between these versions are shown below.

Name: ABORT2 Type: Subroutine Category: Dashboard Summary: Set/unset the lock target for a missile and update the dashboard
Set the lock target for the leftmost missile and update the dashboard. Arguments: X The slot number of the ship to lock our missile onto, or &FF to remove missile lock

Code variation 1 of 1A variation in the comments only

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Cassette, Flight, Docked

6502SP, Master

Electron

Y The new colour of the missile indicator: * &00 = black (no missile) * &0E = red (armed and locked) * &E0 = yellow/white (armed) * &EE = green/cyan (disarmed)
Y The new colour of the missile indicator: * &00 = black (no missile) * #RED2 = red (armed and locked) * #YELLOW2 = yellow/white (armed) * #GREEN2 = green (disarmed)
Y The new shape of the missile indicator: * &04 = black (no missile) * &11 = black "T" in white square (armed and locked) * &0D = black box in white square (armed) * &09 = white square (disarmed)
.ABORT2 STX MSTG \ Store the target of our missile lock in MSTG LDX NOMSL \ Call MSBAR to update the leftmost indicator in the JSR MSBAR \ dashboard's missile bar, which returns with Y = 0 STY MSAR \ Set MSAR = 0 to indicate that the leftmost missile \ is no longer seeking a target lock RTS \ Return from the subroutine
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