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Flight: me1

[BBC Micro disc version, Flight]

Name: me1 [Show more] Type: Subroutine Category: Flight Summary: Erase an old in-flight message and display a new one
Context: See this subroutine in context in the source code Variations: See code variations for this subroutine in the different versions References: This subroutine is called as follows: * MESS calls me1

Arguments: A The text token to be printed X Must be set to 0
.me1 STX DLY \ Set the message delay in DLY to 0, so any new \ in-flight messages will be shown instantly PHA \ Store the new message token we want to print LDA MCH \ Set A to the token number of the message that is JSR mes9 \ currently on-screen, and call mes9 to print it (which \ will remove it from the screen, as printing is done \ using EOR logic) PLA \ Restore the new message token EQUB &2C \ Fall through into ou2 to print the new message, but \ skip the first instruction by turning it into \ &2C &A9 &6C, or BIT &6CA9, which does nothing apart \ from affect the flags