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⌂ ∞ ▽ Elite on the BBC Micro and NES

Text: PrintMessage

[NES version, Bank 0]

       Name: PrintMessage                                            [Show more]
       Type: Subroutine
   Category: Text
    Summary: Print a message in the middle of the screen (used for "GAME OVER"
             and demo missile messages only)

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DEATH calls PrintMessage
             * FRMIS calls PrintMessage




 Arguments:

   A                    The text token to be printed

   Y                    The length of time to leave the message on-screen



.PrintMessage

 PHA                    ; Store A on the stack so we can restore it after the
                        ; following

 STY DLY                ; Set the message delay in DLY to Y

 LDA #%11000000         ; Set the DTW4 flag to %11000000 (justify text, buffer
 STA DTW4               ; entire token including carriage returns)

 LDA #0                 ; Set DTW5 = 0, to reset the size of the message in the
 STA DTW5               ; text buffer at BUF

 PLA                    ; Restore A from the stack

 JSR ex_b2              ; Print the recursive token in A

 JMP StoreMessage       ; Jump to StoreMessage to copy the message from the
                        ; justified text buffer in BUF into the message buffer
                        ; at messageBuffer, returning from the subroutine using
                        ; a tail call