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Elite on the BBC Micro

Version analysis of hm

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

Code variations between these versions are shown below.

Name: hm Type: Subroutine Category: Charts Summary: Select the closest system and redraw the chart crosshairs
Set the system closest to galactic coordinates (QQ9, QQ10) as the selected system, redraw the crosshairs on the chart accordingly (if they are being shown), and, if this is not a space view, clear the bottom three text rows of the screen.
.hm JSR TT103 \ Draw small crosshairs at coordinates (QQ9, QQ10), \ which will erase the crosshairs currently there JSR TT111 \ Select the system closest to galactic coordinates \ (QQ9, QQ10) JSR TT103 \ Draw small crosshairs at coordinates (QQ9, QQ10), \ which will draw the crosshairs at our current home \ system

Code variation 1 of 1Specific to an individual platform

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Cassette, Electron

Flight, Docked, 6502SP, Master

LDA QQ11 \ If this is a space view, return from the subroutine BEQ SC5 \ (as SC5 contains an RTS) \ Otherwise fall through into CLYNS to clear space at \ the bottom of the screen
JMP CLYNS \ Clear the bottom three text rows of the upper screen, \ and move the text cursor to column 1 on row 21, i.e. \ the start of the top row of the three bottom rows \ Return from the subroutine using a tail call
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